Adding upstream version 0.45+dfsg.upstream/0.45+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

35 files changed, 4489 insertions, 0 deletions

diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
new file mode 100644
index 0000000..27b9040
--- /dev/null
+++ b/.github/workflows/run_tests.yml
@@ -0,0 +1,37 @@
+name: run_tests
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - name: "Installs dependencies"
+        run: |
+          curl -sSL https://install.python-poetry.org | python3 -
+      - run: ~/.local/share/pypoetry/venv/bin/poetry install --with test
+      - run: make lint
+  tests:
+    name: tests
+    strategy:
+      matrix:
+        python: ["3.10", "3.11", "3.12"]
+      fail-fast: false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: "Installs dependencies"
+        run: |
+          curl -sSL https://install.python-poetry.org | python3 -
+      - run: ~/.local/share/pypoetry/venv/bin/poetry install --with test
+      - run: make test
diff --git a/.github/workflows/upload-to-pypi.yml b/.github/workflows/upload-to-pypi.yml
new file mode 100644
index 0000000..2503665
--- /dev/null
+++ b/.github/workflows/upload-to-pypi.yml
@@ -0,0 +1,29 @@
+name: Upload to PyPI
+
+on:
+  # Triggers the workflow when a release is created
+  release:
+    types: [released]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: "Installs dependencies"
+        run: |
+          curl -sSL https://install.python-poetry.org | python3 -
+
+      - name: "Builds and uploads to PyPI"
+        run: |
+          ~/.local/share/pypoetry/venv/bin/poetry build
+          ~/.local/share/pypoetry/venv/bin/poetry publish
+
+        env:
+          POETRY_PYPI_TOKEN_PYPI: ${{ secrets.TOKEN_PYPI }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3f7fb77
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,122 @@
+docs/build
+.DS_Store
+.vscode
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+covreport/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# Pyre type checker
+.pyre/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..d523706
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,12 @@
+exclude: ^(docs)/
+fail_fast: true
+repos:
+  - repo: local
+    hooks:
+      - id: lint
+        name: lint
+        entry: make lint
+        language: system
+        types: [python]
+        pass_filenames: false
+        always_run: true
diff --git a/MIT-LICENSE b/MIT-LICENSE
new file mode 100644
index 0000000..ae168dc
--- /dev/null
+++ b/MIT-LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021-2022 Juan-Pablo Scaletti
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..139a760
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,37 @@
+.PHONY: test
+test:
+	poetry run pytest -x src/jinjax tests
+
+.PHONY: lint
+lint:
+	poetry run ruff check src/jinjax tests
+
+.PHONY: coverage
+coverage:
+	poetry run pytest --cov-config=pyproject.toml --cov-report html --cov jinjax src/jinjax tests
+
+.PHONY: types
+types:
+	poetry run pyright src/jinjax
+
+.PHONY: install
+install:
+	poetry install --with dev,test
+	poetry run pre-commit install
+
+.PHONY: install.docs
+install.docs:
+	pip install -e ../jinjax-ui/
+	pip install -e ../claydocs/
+
+.PHONY: docs
+docs:
+	cd docs && python docs.py
+
+.PHONY: docs.build
+docs.build:
+	cd docs && python docs.py build
+
+.PHONY: docs.deploy
+docs.deploy:
+	cd docs && ./deploy.sh
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9943219
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+<h1>
+  <img src="https://github.com/jpsca/jinjax/raw/main/jinjax-logo.png" height="50" align="top">
+</h1>
+
+From chaos to clarity: The power of components in your server-side-rendered Python web app.
+
+**Documentation:** https://jinjax.scaletti.dev/
+
+Write server-side components as single Jinja template files.
+Use them as HTML tags without doing any importing.
+
+
+## Roadmap
+
+#### Planned
+- [ ] Type checking at runtime
+- [ ] ...
+
+#### Done
+- [x] Slots
+- [x] Autoloading assets (optional?) (`Card.jinja` autoloads `Card.css` and/or `Card.js` if exists)
diff --git a/benchmark/Card.jinja b/benchmark/Card.jinja
new file mode 100644
index 0000000..3a0e2e8
--- /dev/null
+++ b/benchmark/Card.jinja
@@ -0,0 +1,4 @@
+<section class="card">
+{{ content }}
+<CloseBtn disabled />
+</section>
diff --git a/benchmark/CloseBtn.jinja b/benchmark/CloseBtn.jinja
new file mode 100644
index 0000000..c4fd809
--- /dev/null
+++ b/benchmark/CloseBtn.jinja
@@ -0,0 +1,2 @@
+{#def disabled=False -#}
+<button type="button"{{ " disabled" if disabled else "" }}>&times;</button>
diff --git a/benchmark/Greeting.jinja b/benchmark/Greeting.jinja
new file mode 100644
index 0000000..1cd2abe
--- /dev/null
+++ b/benchmark/Greeting.jinja
@@ -0,0 +1,2 @@
+{#def message #}
+<div class="greeting [&_a]:flex">{{ message }}</div>
diff --git a/benchmark/Layout.jinja b/benchmark/Layout.jinja
new file mode 100644
index 0000000..2437b70
--- /dev/null
+++ b/benchmark/Layout.jinja
@@ -0,0 +1,13 @@
+{#def title #}
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport" />
+<title>{{ title }}</title>
+</head>
+<body>
+{{ content }}
+</body>
+</html>
diff --git a/benchmark/Real.jinja b/benchmark/Real.jinja
new file mode 100644
index 0000000..163b3af
--- /dev/null
+++ b/benchmark/Real.jinja
@@ -0,0 +1,8 @@
+{#def message #}
+
+<Layout title="Hello">
+<Card>
+<Greeting message={{ message }} />
+<button type="button">Close</button>
+</Card>
+</Layout>
diff --git a/benchmark/Simple.jinja b/benchmark/Simple.jinja
new file mode 100644
index 0000000..7b3c9d1
--- /dev/null
+++ b/benchmark/Simple.jinja
@@ -0,0 +1,16 @@
+{#def message #}
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport" />
+<title>{{ message }}</title>
+</head>
+<body>
+<section class="card">
+<div class="greeting [&_a]:flex">{{ message }}</div>
+<button type="button">Close</button>
+<button type="button" disabled>&times;</button>
+</section>
+</body>
+</html>
diff --git a/benchmark/benchmark.py b/benchmark/benchmark.py
new file mode 100644
index 0000000..09a7447
--- /dev/null
+++ b/benchmark/benchmark.py
@@ -0,0 +1,93 @@
+import timeit
+from pathlib import Path
+
+from fastapi.templating import Jinja2Templates
+from jinja2 import Environment, FileSystemLoader
+from jinjax import Catalog
+
+
+here = Path(__file__).parent
+number = 10_000
+
+catalog = Catalog()
+catalog.add_folder(here)
+
+env = Environment(loader=FileSystemLoader(here))
+
+templates = Jinja2Templates(directory=here)
+
+
+def render_jinjax_simple():
+    """simple case"""
+    catalog.render("Simple", message="Hey there")
+
+
+def render_jinjax_real():
+    """realistic case"""
+    catalog.render("Real", message="Hey there")
+
+
+def render_jinja():
+    env.get_template("hello.html").render(message="Hey there")
+
+
+def render_fastapi():
+    templates.TemplateResponse("hello.html", {"request": None, "message": "Hey there"})
+
+
+def benchmark_no_cache(func):
+    print(f"NO CACHE: {number:_} renders of {func.__doc__}...\n")
+    catalog.use_cache = False
+    benchmark(func)
+
+
+def benchmark_auto_reload(func):
+    print(f"CACHE, AUTO-RELOAD: {number:_} renders of {func.__doc__}...\n")
+    catalog.use_cache = True
+    catalog.auto_reload = True
+    benchmark(func)
+
+
+def benchmark_no_auto_reload(func):
+    print(f"CACHE, NO AUTO-RELOAD: {number:_} renders of {func.__doc__}...\n")
+    catalog.use_cache = True
+    catalog.auto_reload = False
+    benchmark(func)
+
+
+def benchmark(func):
+    time_jinjax = timeit.timeit(func, number=number)
+    print_line("JinjaX", time_jinjax)
+    print(f"{time_jinjax / time_jinja:.1f} times Jinja")
+    print(f"{time_jinjax / time_fastapi:.1f} times FastApi")
+
+
+def print_line(name, time):
+    print(f"{name}: {(time / number):.12f}s per render ({(1_000_000 * time / number):.0f}µs), {time:.1f}s total")
+
+
+def print_separator():
+    print()
+    print("-" * 60)
+
+
+if __name__ == "__main__":
+    print(f"Benchmarking...\n")
+    time_jinja = timeit.timeit(render_jinja, number=number)
+    time_fastapi = timeit.timeit(render_fastapi, number=number)
+
+    print_line("Jinja", time_jinja)
+    print_line("FastApi", time_fastapi)
+    print_separator()
+    benchmark_no_cache(render_jinjax_simple)
+    print_separator()
+    benchmark_auto_reload(render_jinjax_simple)
+    print_separator()
+    benchmark_no_auto_reload(render_jinjax_simple)
+    print_separator()
+    benchmark_no_cache(render_jinjax_real)
+    print_separator()
+    benchmark_auto_reload(render_jinjax_real)
+    print_separator()
+    benchmark_no_auto_reload(render_jinjax_real)
+    print()
diff --git a/benchmark/hello.html b/benchmark/hello.html
new file mode 100644
index 0000000..762b921
--- /dev/null
+++ b/benchmark/hello.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport" />
+<title>{{ message }}</title>
+</head>
+<body>
+<section class="card">
+<div class="greeting [&_a]:flex">{{ message }}</div>
+<button type="button">Close</button>
+<button type="button" disabled>&times;</button>
+</section>
+</body>
+</html>
diff --git a/benchmark/profile.py b/benchmark/profile.py
new file mode 100644
index 0000000..8c88ad0
--- /dev/null
+++ b/benchmark/profile.py
@@ -0,0 +1,29 @@
+from pathlib import Path
+
+from jinjax import Catalog, Component
+from line_profiler import LineProfiler
+
+
+HERE = Path(__file__).parent
+
+catalog = Catalog()
+catalog.add_folder(HERE)
+
+profile = LineProfiler(
+    Catalog.irender,
+    Catalog._get_from_file,
+    Component.__init__,
+    Component.from_cache,
+    Component.filter_args,
+    Component.render,
+)
+
+def render_jinjax():
+    for _ in range(1000):
+        catalog.render("Hello", message="Hey there")
+
+
+if __name__ == "__main__":
+    print("Profiling...")
+    profile.runcall(render_jinjax)
+    profile.print_stats()
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..d6bd744
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "jinjax",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..6bd91d8
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,587 @@
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+
+[[package]]
+name = "cachetools"
+version = "5.3.3"
+description = "Extensible memoizing collections and decorators"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "cachetools-5.3.3-py3-none-any.whl", hash = "sha256:0abad1021d3f8325b2fc1d2e9c8b9c9d57b04c3932657a72465447332c24d945"},
+    {file = "cachetools-5.3.3.tar.gz", hash = "sha256:ba29e2dfa0b8b556606f097407ed1aa62080ee108ab0dc5ec9d6a723a007d105"},
+]
+
+[[package]]
+name = "cfgv"
+version = "3.4.0"
+description = "Validate configuration and produce human readable error messages."
+optional = false
+python-versions = ">=3.8"
+files = [
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+]
+
+[[package]]
+name = "chardet"
+version = "5.2.0"
+description = "Universal encoding detector for Python 3"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "chardet-5.2.0-py3-none-any.whl", hash = "sha256:e1cf59446890a00105fe7b7912492ea04b6e6f06d4b742b2c788469e34c82970"},
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+]
+
+[[package]]
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+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
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+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "coverage"
+version = "7.5.4"
+description = "Code coverage measurement for Python"
+optional = false
+python-versions = ">=3.8"
+files = [
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+description = "An extremely fast Python linter and code formatter, written in Rust."
+optional = false
+python-versions = ">=3.7"
+files = [
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+]
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+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
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+]
+
+[[package]]
+name = "tox"
+version = "4.15.1"
+description = "tox is a generic virtualenv management and test command line tool"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "tox-4.15.1-py3-none-any.whl", hash = "sha256:f00a5dc4222b358e69694e47e3da0227ac41253509bca9f45aa8f012053e8d9d"},
+    {file = "tox-4.15.1.tar.gz", hash = "sha256:53a092527d65e873e39213ebd4bd027a64623320b6b0326136384213f95b7076"},
+]
+
+[package.dependencies]
+cachetools = ">=5.3.2"
+chardet = ">=5.2"
+colorama = ">=0.4.6"
+filelock = ">=3.13.1"
+packaging = ">=23.2"
+platformdirs = ">=4.1"
+pluggy = ">=1.3"
+pyproject-api = ">=1.6.1"
+tomli = {version = ">=2.0.1", markers = "python_version < \"3.11\""}
+virtualenv = ">=20.25"
+
+[package.extras]
+docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-argparse-cli (>=1.11.1)", "sphinx-autodoc-typehints (>=1.25.2)", "sphinx-copybutton (>=0.5.2)", "sphinx-inline-tabs (>=2023.4.21)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.11)"]
+testing = ["build[virtualenv] (>=1.0.3)", "covdefaults (>=2.3)", "detect-test-pollution (>=1.2)", "devpi-process (>=1)", "diff-cover (>=8.0.2)", "distlib (>=0.3.8)", "flaky (>=3.7)", "hatch-vcs (>=0.4)", "hatchling (>=1.21)", "psutil (>=5.9.7)", "pytest (>=7.4.4)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-xdist (>=3.5)", "re-assert (>=1.1)", "time-machine (>=2.13)", "wheel (>=0.42)"]
+
+[[package]]
+name = "typing-extensions"
+version = "4.12.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "typing_extensions-4.12.2-py3-none-any.whl", hash = "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d"},
+    {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
+]
+
+[[package]]
+name = "virtualenv"
+version = "20.26.3"
+description = "Virtual Python Environment builder"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "virtualenv-20.26.3-py3-none-any.whl", hash = "sha256:8cc4a31139e796e9a7de2cd5cf2489de1217193116a8fd42328f1bd65f434589"},
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+]
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+[package.dependencies]
+distlib = ">=0.3.7,<1"
+filelock = ">=3.12.2,<4"
+platformdirs = ">=3.9.1,<5"
+
+[package.extras]
+docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2,!=7.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
+test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
+
+[[package]]
+name = "whitenoise"
+version = "6.7.0"
+description = "Radically simplified static file serving for WSGI applications"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "whitenoise-6.7.0-py3-none-any.whl", hash = "sha256:a1ae85e01fdc9815d12fa33f17765bc132ed2c54fa76daf9e39e879dd93566f6"},
+    {file = "whitenoise-6.7.0.tar.gz", hash = "sha256:58c7a6cd811e275a6c91af22e96e87da0b1109e9a53bb7464116ef4c963bf636"},
+]
+
+[package.extras]
+brotli = ["brotli"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "36b1c02ae6cf0c193066f5d7371995106331bd05502b88f82da7b0d5a76318b6"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..693d296
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,189 @@
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+
+[tool.poetry]
+name = "jinjax"
+version = "0.45"
+description = "Replace your HTML templates with Python server-Side components"
+authors = ["Juan-Pablo Scaletti <juanpablo@jpscaletti.com>"]
+license = "MIT"
+readme = "README.md"
+homepage = "https://jinjax.scaletti.dev/"
+repository = "https://github.com/jpsca/jinjax"
+documentation = "https://jinjax.scaletti.dev/guides/"
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Environment :: Web Environment",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
+    "Topic :: Software Development :: Libraries",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: User Interfaces",
+    "Topic :: Text Processing :: Markup :: HTML",
+    "Typing :: Typed",
+]
+
+[tool.poetry.dependencies]
+python = "^3.10"
+jinja2 = ">=3.0"
+markupsafe = ">=2.0"
+whitenoise = ">=5.3"
+
+[tool.poetry.group.dev]
+optional = true
+
+[tool.poetry.group.dev.dependencies]
+pyright = ">=1.1.282"
+pre-commit = "*"
+tox = "*"
+typing-extensions = "^4.11.0"
+
+[tool.poetry.group.test]
+optional = true
+
+[tool.poetry.group.test.dependencies]
+pytest = "^8.1.1"
+pytest-cov = "*"
+ruff = ">0.3"
+
+
+[tool.coverage.run]
+branch = true
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "TYPE_CHECKING",
+    "def __repr__",
+    "def __str__",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:"
+]
+
+[tool.coverage.html]
+directory = "covreport"
+
+
+[tool.pyright]
+include = ["src"]
+exclude = [
+    "**/node_modules",
+    "**/__pycache__",
+    "**/tests",
+]
+ignore = []
+reportPrivateImportUsage = false
+reportWildcardImportFromLibrary = false
+
+
+[tool.pytest.ini_options]
+addopts = "--doctest-modules"
+
+
+[tool.tox]
+legacy_tox_ini = """
+[tox]
+skipsdist = True
+envlist = py310,py311,py312,pypy3.10
+
+[testenv]
+skip_install = true
+allowlist_externals = poetry
+commands =
+    pip install -U pip wheel
+    poetry install --with test
+    pytest -x src/jinjax tests
+"""
+
+
+[tool.ruff]
+line-length = 90
+indent-width = 4
+target-version = "py311"
+
+exclude = [
+  ".*",
+  "_build",
+  "build",
+  "covreport",
+  "dist",
+]
+include = ["*.py"]
+
+
+[tool.ruff.format]
+# Like Black, use double quotes for strings.
+quote-style = "double"
+
+# Like Black, indent with spaces, rather than tabs.
+indent-style = "space"
+
+# Like Black, respect magic trailing commas.
+skip-magic-trailing-comma = false
+
+# Like Black, automatically detect the appropriate line ending.
+line-ending = "auto"
+
+# Enable auto-formatting of code examples in docstrings. Markdown,
+# reStructuredText code/literal blocks and doctests are all supported.
+#
+# This is currently disabled by default, but it is planned for this
+# to be opt-out in the future.
+docstring-code-format = false
+
+# Set the line length limit used when formatting code snippets in
+# docstrings.
+#
+# This only has an effect when the `docstring-code-format` setting is
+# enabled.
+docstring-code-line-length = "dynamic"
+
+
+[tool.ruff.lint]
+fixable = ["ALL"]
+
+ignore = [
+	# x is too complex
+	"C901",
+	# whitespace before ':'
+	"E203",
+	"E501",
+	# x defined from star imports
+	"F405",
+	# line break before binary operator
+	"W505",
+	"W605",
+]
+select = [
+	# bugbear
+	"B",
+	# mccabe"", comprehensions, commas
+	"C",
+	# pycodestyle errors
+	"E",
+	# pyflakes
+	"F",
+	# logging format
+	"G",
+	# imports
+	"I",
+	# quotes
+	"Q",
+	# pycodestyle warnings
+	"W",
+]
+
+
+[tool.ruff.lint.isort]
+known-first-party = ["jinjax"]
+
+# Use two line after imports.
+lines-after-imports = 2
diff --git a/src/jinjax/__init__.py b/src/jinjax/__init__.py
new file mode 100644
index 0000000..e30f39b
--- /dev/null
+++ b/src/jinjax/__init__.py
@@ -0,0 +1,5 @@
+from .catalog import Catalog  # noqa
+from .component import Component  # noqa
+from .exceptions import *  # noqa
+from .jinjax import JinjaX  # noqa
+from .html_attrs import HTMLAttrs, LazyString  # noqa
diff --git a/src/jinjax/catalog.py b/src/jinjax/catalog.py
new file mode 100644
index 0000000..c70f81d
--- /dev/null
+++ b/src/jinjax/catalog.py
@@ -0,0 +1,530 @@
+import os
+import typing as t
+from collections import UserString
+from hashlib import sha256
+from pathlib import Path
+
+import jinja2
+from markupsafe import Markup
+
+from .component import Component
+from .exceptions import ComponentNotFound, InvalidArgument
+from .html_attrs import HTMLAttrs
+from .jinjax import JinjaX
+from .middleware import ComponentsMiddleware
+from .utils import DELIMITER, SLASH, get_url_prefix, logger
+
+
+DEFAULT_URL_ROOT = "/static/components/"
+ALLOWED_EXTENSIONS = (".css", ".js", ".mjs")
+DEFAULT_PREFIX = ""
+DEFAULT_EXTENSION = ".jinja"
+ARGS_ATTRS = "attrs"
+ARGS_CONTENT = "content"
+
+
+class CallerWrapper(UserString):
+    def __init__(self, caller: t.Callable | None, content: str = "") -> None:
+        self._caller = caller
+        # Pre-calculate the defaut content so the assets are loaded
+        self._content = caller("") if caller else Markup(content)
+
+    def __call__(self, slot: str = "") -> str:
+        if slot and self._caller:
+            return self._caller(slot)
+        return self._content
+
+    def __html__(self) -> str:
+        return self()
+
+    @property
+    def data(self) -> str:  # type: ignore
+        return self()
+
+
+
+class Catalog:
+    """
+    The object that manages the components and their global settings.
+
+    Arguments:
+
+        globals:
+            Dictionary of Jinja globals to add to the Catalog's Jinja environment
+            (or the one passed in `jinja_env`).
+
+        filters:
+            Dictionary of Jinja filters to add to the Catalog's Jinja environment
+            (or the one passed in `jinja_env`).
+
+        tests:
+            Dictionary of Jinja tests to add to the Catalog's Jinja environment
+            (or the one passed in `jinja_env`).
+
+        extensions:
+            List of Jinja extensions to add to the Catalog's Jinja environment
+            (or the one passed in `jinja_env`). The `jinja2.ext.do` extension is
+            always added at the end of these.
+
+        jinja_env:
+            Custom Jinja environment to use. This argument is useful to reuse an
+            existing Jinja Environment from your web framework.
+
+        root_url:
+            Add this prefix to every asset URL of the static middleware. By default,
+            it is `/static/components/`, so, for example, the URL of the CSS file of
+            a `Card` component is `/static/components/Card.css`.
+
+            You can also change this argument so the assets are requested from a
+            Content Delivery Network (CDN) in production, for example,
+            `root_url="https://example.my-cdn.com/"`.
+
+        file_ext:
+            The extensions the components files have. By default, ".jinja".
+
+            This argument can also be a list to allow more than one type of file to
+            be a component.
+
+        use_cache:
+            Cache the metadata of the component in memory.
+
+        auto_reload:
+            Used with `use_cache`. If `True`, the last-modified date of the component
+            file is checked every time to see if the cache is up-to-date.
+
+            Set to `False` in production.
+
+        fingerprint:
+            If `True`, inserts a hash of the updated time into the URL of the
+            asset files (after the name but before the extension).
+
+            This strategy encourages long-term caching while ensuring that new copies
+            are only requested when the content changes, as any modification alters the
+            fingerprint and thus the filename.
+
+            **WARNING**: Only works if the server knows how to filter the fingerprint
+            to get the real name of the file.
+
+    Attributes:
+
+        collected_css:
+            List of CSS paths collected during a render.
+
+        collected_js:
+            List of JS paths collected during a render.
+
+        prefixes:
+            Mapping between folder prefixes and the Jinja loader that uses.
+
+    """
+
+    __slots__ = (
+        "prefixes",
+        "root_url",
+        "file_ext",
+        "jinja_env",
+        "fingerprint",
+        "collected_css",
+        "collected_js",
+        "auto_reload",
+        "use_cache",
+        "_tmpl_globals",
+        "_cache",
+    )
+
+    def __init__(
+        self,
+        *,
+        globals: "dict[str, t.Any] | None" = None,
+        filters: "dict[str, t.Any] | None" = None,
+        tests: "dict[str, t.Any] | None" = None,
+        extensions: "list | None" = None,
+        jinja_env: "jinja2.Environment | None" = None,
+        root_url: str = DEFAULT_URL_ROOT,
+        file_ext: "str | tuple[str, ...]" = DEFAULT_EXTENSION,
+        use_cache: bool = True,
+        auto_reload: bool = True,
+        fingerprint: bool = False,
+    ) -> None:
+        self.prefixes: dict[str, jinja2.FileSystemLoader] = {}
+        self.collected_css: list[str] = []
+        self.collected_js: list[str] = []
+        self.file_ext = file_ext
+        self.use_cache = use_cache
+        self.auto_reload = auto_reload
+        self.fingerprint = fingerprint
+
+        root_url = root_url.strip().rstrip(SLASH)
+        self.root_url = f"{root_url}{SLASH}"
+
+        env = jinja2.Environment(undefined=jinja2.StrictUndefined)
+        extensions = [*(extensions or []), "jinja2.ext.do", JinjaX]
+        globals = globals or {}
+        filters = filters or {}
+        tests = tests or {}
+
+        if jinja_env:
+            env.extensions.update(jinja_env.extensions)
+            env.autoescape = jinja_env.autoescape
+            globals.update(jinja_env.globals)
+            filters.update(jinja_env.filters)
+            tests.update(jinja_env.tests)
+            jinja_env.globals["catalog"] = self
+            jinja_env.filters["catalog"] = self
+
+        globals["catalog"] = self
+        filters["catalog"] = self
+
+        for ext in extensions:
+            env.add_extension(ext)
+        env.globals.update(globals)
+        env.filters.update(filters)
+        env.tests.update(tests)
+        env.extend(catalog=self)
+
+        self.jinja_env = env
+
+        self._tmpl_globals: "t.MutableMapping[str, t.Any] | None" = None
+        self._cache: dict[str, dict] = {}
+
+    @property
+    def paths(self) -> list[Path]:
+        """
+        A helper property that returns a list of all the components folder paths.
+        """
+        _paths = []
+        for loader in self.prefixes.values():
+            _paths.extend(loader.searchpath)
+        return _paths
+
+    def add_folder(
+        self,
+        root_path: "str | Path",
+        *,
+        prefix: str = DEFAULT_PREFIX,
+    ) -> None:
+        """
+        Add a folder path from where to search for components, optionally under a prefix.
+
+        The prefix acts like a namespace. For example, the name of a
+        `components/Card.jinja` component is, by default, "Card",
+        but under the prefix "common", it becomes "common.Card".
+
+        The rule for subfolders remains the same: a `components/wrappers/Card.jinja`
+        name is, by default, "wrappers.Card", but under the prefix "common",
+        it becomes "common.wrappers.Card".
+
+        If there is more than one component with the same name in multiple
+        added folders under the same prefix, the one in the folder added
+        first takes precedence.
+
+        Arguments:
+
+            root_path:
+                Absolute path of the folder with component files.
+
+            prefix:
+                Optional prefix that all the components in the folder will
+                have. The default is empty.
+
+        """
+        prefix = prefix.strip().strip(f"{DELIMITER}{SLASH}").replace(SLASH, DELIMITER)
+
+        root_path = str(root_path)
+        if prefix in self.prefixes:
+            loader = self.prefixes[prefix]
+            if root_path in loader.searchpath:
+                return
+            logger.debug(f"Adding folder `{root_path}` with the prefix `{prefix}`")
+            loader.searchpath.append(root_path)
+        else:
+            logger.debug(f"Adding folder `{root_path}` with the prefix `{prefix}`")
+            self.prefixes[prefix] = jinja2.FileSystemLoader(root_path)
+
+    def add_module(self, module: t.Any, *, prefix: str | None = None) -> None:
+        """
+        Reads an absolute path from `module.components_path` and an optional prefix
+        from `module.prefix`, then calls `Catalog.add_folder(path, prefix)`.
+
+        The prefix can also be passed as an argument instead of being read from
+        the module.
+
+        This method exists to make it easy and consistent to have
+        components installable as Python libraries.
+
+        Arguments:
+
+            module:
+                A Python module.
+
+            prefix:
+                An optional prefix that replaces the one the module
+                might include.
+
+        """
+        mprefix = (
+            prefix if prefix is not None else getattr(module, "prefix", DEFAULT_PREFIX)
+        )
+        self.add_folder(module.components_path, prefix=mprefix)
+
+    def render(
+        self,
+        /,
+        __name: str,
+        *,
+        caller: "t.Callable | None" = None,
+        **kw,
+    ) -> str:
+        """
+        Resets the `collected_css` and `collected_js` lists and renders the
+        component and subcomponents inside of it.
+
+        This is the method you should call to render a parent component from a
+        view/controller in your app.
+
+        """
+        self.collected_css = []
+        self.collected_js = []
+        self._tmpl_globals = kw.pop("__globals", None)
+        return self.irender(__name, caller=caller, **kw)
+
+    def irender(
+        self,
+        /,
+        __name: str,
+        *,
+        caller: "t.Callable | None" = None,
+        **kw,
+    ) -> str:
+        """
+        Renders the component and subcomponents inside of it **without**
+        resetting the `collected_css` and `collected_js` lists.
+
+        This is the method you should call to render individual components that
+        are later inserted into a parent template.
+
+        """
+        content = (kw.pop("_content", kw.pop("__content", "")) or "").strip()
+        attrs = kw.pop("_attrs", kw.pop("__attrs", None)) or {}
+        file_ext = kw.pop("_file_ext", kw.pop("__file_ext", ""))
+        source = kw.pop("_source", kw.pop("__source", ""))
+
+        prefix, name = self._split_name(__name)
+        self.jinja_env.loader = self.prefixes[prefix]
+
+        if source:
+            logger.debug("Rendering from source %s", __name)
+            component = self._get_from_source(name=name, prefix=prefix, source=source)
+        elif self.use_cache:
+            logger.debug("Rendering from cache or file %s", __name)
+            component = self._get_from_cache(prefix=prefix, name=name, file_ext=file_ext)
+        else:
+            logger.debug("Rendering from file %s", __name)
+            component = self._get_from_file(prefix=prefix, name=name, file_ext=file_ext)
+
+        root_path = component.path.parent if component.path else None
+
+        for url in component.css:
+            if (
+                root_path
+                and self.fingerprint
+                and not url.startswith(("http://", "https://"))
+            ):
+                url = self._fingerprint(root_path, url)
+
+            if url not in self.collected_css:
+                self.collected_css.append(url)
+
+        for url in component.js:
+            if (
+                root_path
+                and self.fingerprint
+                and not url.startswith(("http://", "https://"))
+            ):
+                url = self._fingerprint(root_path, url)
+
+            if url not in self.collected_js:
+                self.collected_js.append(url)
+
+        attrs = attrs.as_dict if isinstance(attrs, HTMLAttrs) else attrs
+        attrs.update(kw)
+        kw = attrs
+        args, extra = component.filter_args(kw)
+        try:
+            args[ARGS_ATTRS] = HTMLAttrs(extra)
+        except Exception as exc:
+            raise InvalidArgument(
+                f"The arguments of the component <{component.name}>"
+                f"were parsed incorrectly as:\n {str(kw)}"
+            ) from exc
+
+        args[ARGS_CONTENT] = CallerWrapper(caller=caller, content=content)
+        return component.render(**args)
+
+    def get_middleware(
+        self,
+        application: t.Callable,
+        allowed_ext: "t.Iterable[str] | None" = ALLOWED_EXTENSIONS,
+        **kwargs,
+    ) -> ComponentsMiddleware:
+        """
+        Wraps you application with [Withenoise](https://whitenoise.readthedocs.io/),
+        a static file serving middleware.
+
+        Tecnically not neccesary if your components doesn't use static assets
+        or if you serve them by other means.
+
+        Arguments:
+
+            application:
+                A WSGI application
+
+            allowed_ext:
+                A list of file extensions the static middleware is allowed to read
+                and return. By default, is just ".css", ".js", and ".mjs".
+
+        """
+        logger.debug("Creating middleware")
+        middleware = ComponentsMiddleware(
+            application=application, allowed_ext=tuple(allowed_ext or []), **kwargs
+        )
+        for prefix, loader in self.prefixes.items():
+            url_prefix = get_url_prefix(prefix)
+            url = f"{self.root_url}{url_prefix}"
+            for root in loader.searchpath[::-1]:
+                middleware.add_files(root, url)
+
+        return middleware
+
+    def get_source(self, cname: str, file_ext: "tuple[str, ...] | str" = "") -> str:
+        """
+        A helper method that returns the source file of a component.
+        """
+        prefix, name = self._split_name(cname)
+        path, _ = self._get_component_path(prefix, name, file_ext=file_ext)
+        return path.read_text()
+
+    def render_assets(self) -> str:
+        """
+        Uses the `collected_css` and `collected_js` lists to generate
+        an HTML fragment with `<link rel="stylesheet" href="{url}">`
+        and `<script type="module" src="{url}"></script>` tags.
+
+        The URLs are prepended by `root_url` unless they begin with
+        "http://" or "https://".
+        """
+        html_css = []
+        for url in self.collected_css:
+            if not url.startswith(("http://", "https://")):
+                url = f"{self.root_url}{url}"
+            html_css.append(f'<link rel="stylesheet" href="{url}">')
+
+        html_js = []
+        for url in self.collected_js:
+            if not url.startswith(("http://", "https://")):
+                url = f"{self.root_url}{url}"
+            html_js.append(f'<script type="module" src="{url}"></script>')
+
+        return Markup("\n".join(html_css + html_js))
+
+    # Private
+
+    def _fingerprint(self, root: Path, filename: str) -> str:
+        relpath = Path(filename.lstrip(os.path.sep))
+        filepath = root / relpath
+        if not filepath.is_file():
+            return filename
+
+        stat = filepath.stat()
+        fingerprint = sha256(str(stat.st_mtime).encode()).hexdigest()
+
+        ext = "".join(relpath.suffixes)
+        stem = relpath.name.removesuffix(ext)
+        parent = str(relpath.parent)
+        parent = "" if parent == "." else f"{parent}/"
+
+        return f"{parent}{stem}-{fingerprint}{ext}"
+
+    def _get_from_source(self, *, name: str, prefix: str, source: str) -> Component:
+        tmpl = self.jinja_env.from_string(source, globals=self._tmpl_globals)
+        component = Component(name=name, prefix=prefix, source=source, tmpl=tmpl)
+        return component
+
+    def _get_from_cache(self, *, prefix: str, name: str, file_ext: str) -> Component:
+        key = f"{prefix}.{name}.{file_ext}"
+        cache = self._from_cache(key)
+        if cache:
+            component = Component.from_cache(
+                cache, auto_reload=self.auto_reload, globals=self._tmpl_globals
+            )
+            if component:
+                return component
+
+        logger.debug("Loading %s", key)
+        component = self._get_from_file(prefix=prefix, name=name, file_ext=file_ext)
+        self._to_cache(key, component)
+        return component
+
+    def _from_cache(self, key: str) -> dict[str, t.Any]:
+        if key not in self._cache:
+            return {}
+        cache = self._cache[key]
+        logger.debug("Loading from cache %s", key)
+        return cache
+
+    def _to_cache(self, key: str, component: Component) -> None:
+        self._cache[key] = component.serialize()
+
+    def _get_from_file(self, *, prefix: str, name: str, file_ext: str) -> Component:
+        path, tmpl_name = self._get_component_path(prefix, name, file_ext=file_ext)
+        component = Component(name=name, prefix=prefix, path=path)
+        component.tmpl = self.jinja_env.get_template(tmpl_name, globals=self._tmpl_globals)
+        return component
+
+    def _split_name(self, cname: str) -> tuple[str, str]:
+        cname = cname.strip().strip(DELIMITER)
+        if DELIMITER not in cname:
+            return DEFAULT_PREFIX, cname
+        for prefix in self.prefixes.keys():
+            _prefix = f"{prefix}{DELIMITER}"
+            if cname.startswith(_prefix):
+                return prefix, cname.removeprefix(_prefix)
+        return DEFAULT_PREFIX, cname
+
+    def _get_component_path(
+        self, prefix: str, name: str, file_ext: "tuple[str, ...] | str" = ""
+    ) -> tuple[Path, str]:
+        name = name.replace(DELIMITER, SLASH)
+        root_paths = self.prefixes[prefix].searchpath
+        name_dot = f"{name}."
+        file_ext = file_ext or self.file_ext
+
+        for root_path in root_paths:
+            for curr_folder, _, files in os.walk(
+                root_path, topdown=False, followlinks=True
+            ):
+                relfolder = os.path.relpath(curr_folder, root_path).strip(".")
+                if relfolder and not name_dot.startswith(relfolder):
+                    continue
+
+                for filename in files:
+                    if relfolder:
+                        filepath = f"{relfolder}/{filename}"
+                    else:
+                        filepath = filename
+                    if filepath.startswith(name_dot) and filepath.endswith(file_ext):
+                        return Path(curr_folder) / filename, filepath
+
+        raise ComponentNotFound(
+            f"Unable to find a file named {name}{file_ext} "
+            f"or one following the pattern {name_dot}*{file_ext}"
+        )
+
+    def _render_attrs(self, attrs: dict[str, t.Any]) -> Markup:
+        html_attrs = []
+        for name, value in attrs.items():
+            if value != "":
+                html_attrs.append(f"{name}={value}")
+            else:
+                html_attrs.append(name)
+        return Markup(" ".join(html_attrs))
diff --git a/src/jinjax/component.py b/src/jinjax/component.py
new file mode 100644
index 0000000..948d170
--- /dev/null
+++ b/src/jinjax/component.py
@@ -0,0 +1,258 @@
+import ast
+import re
+import typing as t
+from keyword import iskeyword
+from pathlib import Path
+
+from jinja2 import Template
+from markupsafe import Markup
+
+from .exceptions import (
+    DuplicateDefDeclaration,
+    InvalidArgument,
+    MissingRequiredArgument,
+)
+from .utils import DELIMITER, get_url_prefix
+
+
+if t.TYPE_CHECKING:
+    from typing_extensions import Self
+
+RX_COMMA = re.compile(r"\s*,\s*")
+
+RX_ARGS_START = re.compile(r"{#-?\s*def\s+")
+RX_CSS_START = re.compile(r"{#-?\s*css\s+")
+RX_JS_START = re.compile(r"{#-?\s*js\s+")
+
+# This regexp matches the meta declarations (`{#def .. #}``, `{#css .. #}``,
+# and `{#js .. #}`) and regular Jinja comments AT THE BEGINNING of the components source.
+# You can also have comments inside the declarations.
+RX_META_HEADER = re.compile(r"^(\s*{#.*?#})+", re.DOTALL)
+
+# This regexep matches comments (everything after a `#`)
+# Used to remove them from inside meta declarations
+RX_INTER_COMMENTS = re.compile(r"\s*#[^\n]*")
+
+
+ALLOWED_NAMES_IN_EXPRESSION_VALUES = {
+    "len": len,
+    "max": max,
+    "min": min,
+    "pow": pow,
+    "sum": sum,
+    # Jinja allows using lowercase booleans, so we do it too for consistency
+    "false": False,
+    "true": True,
+}
+
+
+def eval_expression(input_string):
+    code = compile(input_string, "<string>", "eval")
+    for name in code.co_names:
+        if name not in ALLOWED_NAMES_IN_EXPRESSION_VALUES:
+            raise InvalidArgument(f"Use of {name} not allowed")
+    try:
+        return eval(code, {"__builtins__": {}}, ALLOWED_NAMES_IN_EXPRESSION_VALUES)
+    except NameError as err:
+        raise InvalidArgument(err) from err
+
+
+def is_valid_variable_name(name):
+    return name.isidentifier() and not iskeyword(name)
+
+
+class Component:
+    """Internal class
+    """
+    __slots__ = (
+        "name",
+        "prefix",
+        "url_prefix",
+        "required",
+        "optional",
+        "css",
+        "js",
+        "path",
+        "mtime",
+        "tmpl",
+    )
+
+    def __init__(
+        self,
+        *,
+        name: str,
+        prefix: str = "",
+        url_prefix: str = "",
+        source: str = "",
+        mtime: float = 0,
+        tmpl: "Template | None" = None,
+        path: "Path | None" = None,
+    ) -> None:
+        self.name = name
+        self.prefix = prefix
+        self.url_prefix = url_prefix or get_url_prefix(prefix)
+        self.required: list[str] = []
+        self.optional: dict[str, t.Any] = {}
+        self.css: list[str] = []
+        self.js: list[str] = []
+
+        if path is not None:
+            source = source or path.read_text()
+            mtime = mtime or path.stat().st_mtime
+        if source:
+            self.load_metadata(source)
+
+        if path is not None:
+            default_name = self.name.replace(DELIMITER, "/")
+
+            default_css = f"{default_name}.css"
+            if (path.with_suffix(".css")).is_file():
+                self.css.extend(self.parse_files_expr(default_css))
+
+            default_js = f"{default_name}.js"
+            if (path.with_suffix(".js")).is_file():
+                self.js.extend(self.parse_files_expr(default_js))
+
+        self.path = path
+        self.mtime = mtime
+        self.tmpl = tmpl
+
+    @classmethod
+    def from_cache(
+        cls,
+        cache: dict[str, t.Any],
+        auto_reload: bool = True,
+        globals: "t.MutableMapping[str, t.Any] | None" = None,
+    ) -> "Self | None":
+        path = cache["path"]
+        mtime = cache["mtime"]
+
+        if auto_reload:
+            if not path.is_file() or path.stat().st_mtime != mtime:
+                return None
+
+        self = cls(name=cache["name"])
+        self.prefix = cache["prefix"]
+        self.url_prefix = cache["url_prefix"]
+        self.required = cache["required"]
+        self.optional = cache["optional"]
+        self.css = cache["css"]
+        self.js = cache["js"]
+        self.path = path
+        self.mtime = cache["mtime"]
+        self.tmpl = cache["tmpl"]
+
+        if globals:
+            # updating the template globals, does not affect the environment globals
+            self.tmpl.globals.update(globals)
+
+        return self
+
+    def serialize(self) -> dict[str, t.Any]:
+        return {
+            "name": self.name,
+            "prefix": self.prefix,
+            "url_prefix": self.url_prefix,
+            "required": self.required,
+            "optional": self.optional,
+            "css": self.css,
+            "js": self.js,
+            "path": self.path,
+            "mtime": self.mtime,
+            "tmpl": self.tmpl,
+        }
+
+    def load_metadata(self, source: str) -> None:
+        match = RX_META_HEADER.match(source)
+        if not match:
+            return
+
+        header = match.group(0)
+        # Reversed because I will use `header.pop()`
+        header = header.split("#}")[:-1][::-1]
+        def_found = False
+
+        while header:
+            item = header.pop().strip(" -\n")
+
+            expr = self.read_metadata_item(item, RX_ARGS_START)
+            if expr:
+                if def_found:
+                    raise DuplicateDefDeclaration(self.name)
+                self.required, self.optional = self.parse_args_expr(expr)
+                def_found = True
+                continue
+
+            expr = self.read_metadata_item(item, RX_CSS_START)
+            if expr:
+                expr = RX_INTER_COMMENTS.sub("", expr).replace("\n", " ")
+                self.css = [*self.css, *self.parse_files_expr(expr)]
+                continue
+
+            expr = self.read_metadata_item(item, RX_JS_START)
+            if expr:
+                expr = RX_INTER_COMMENTS.sub("", expr).replace("\n", " ")
+                self.js = [*self.js, *self.parse_files_expr(expr)]
+                continue
+
+    def read_metadata_item(self, source: str, rx_start: re.Pattern) -> str:
+        start = rx_start.match(source)
+        if not start:
+            return ""
+        return source[start.end():].strip()
+
+    def parse_args_expr(self, expr: str) -> tuple[list[str], dict[str, t.Any]]:
+        expr = expr.strip(" *,/")
+        required = []
+        optional = {}
+
+        try:
+            p = ast.parse(f"def component(*,\n{expr}\n): pass")
+        except SyntaxError as err:
+            raise InvalidArgument(err) from err
+
+        args = p.body[0].args  # type: ignore
+        arg_names = [arg.arg for arg in args.kwonlyargs]
+        for name, value in zip(arg_names, args.kw_defaults):  # noqa: B905
+            if value is None:
+                required.append(name)
+                continue
+            expr = ast.unparse(value)
+            optional[name] = eval_expression(expr)
+
+        return required, optional
+
+    def parse_files_expr(self, expr: str) -> list[str]:
+        files = []
+        for url in RX_COMMA.split(expr):
+            url = url.strip("\"'").rstrip("/")
+            if not url:
+                continue
+            if url.startswith(("/", "http://", "https://")):
+                files.append(url)
+            else:
+                files.append(f"{self.url_prefix}{url}")
+        return files
+
+    def filter_args(
+        self, kw: dict[str, t.Any]
+    ) -> tuple[dict[str, t.Any], dict[str, t.Any]]:
+        args = {}
+
+        for key in self.required:
+            if key not in kw:
+                raise MissingRequiredArgument(self.name, key)
+            args[key] = kw.pop(key)
+
+        for key in self.optional:
+            args[key] = kw.pop(key, self.optional[key])
+        extra = kw.copy()
+        return args, extra
+
+    def render(self, **kwargs):
+        assert self.tmpl, f"Component {self.name} has no template"
+        html = self.tmpl.render(**kwargs).strip()
+        return Markup(html)
+
+    def __repr__(self) -> str:
+        return f'<Component "{self.name}">'
diff --git a/src/jinjax/exceptions.py b/src/jinjax/exceptions.py
new file mode 100644
index 0000000..b1fd97f
--- /dev/null
+++ b/src/jinjax/exceptions.py
@@ -0,0 +1,37 @@
+class ComponentNotFound(Exception):
+    """
+    Raised when JinjaX can't find a component by name in none of the
+    added folders, probably because of a typo.
+    """
+
+    def __init__(self, name: str) -> None:
+        msg = f"File with pattern `{name}` not found"
+        super().__init__(msg)
+
+
+class MissingRequiredArgument(Exception):
+    """
+    Raised when a component is used/invoked without passing one or more
+    of its required arguments (those without a default value).
+    """
+
+    def __init__(self, component: str, arg: str) -> None:
+        msg = f"`{component}` component requires a `{arg}` argument"
+        super().__init__(msg)
+
+
+class DuplicateDefDeclaration(Exception):
+    """
+    Raised when a component has more then one `{#def ... #}` declarations.
+    """
+
+    def __init__(self, component: str) -> None:
+        msg = "`" + str(component) + "` has two `{#def ... #}` declarations"
+        super().__init__(msg)
+
+
+class InvalidArgument(Exception):
+    """
+    Raised when the arguments passed to the component cannot be parsed
+    by JinjaX because of an invalid syntax.
+    """
diff --git a/src/jinjax/html_attrs.py b/src/jinjax/html_attrs.py
new file mode 100644
index 0000000..8b4bd35
--- /dev/null
+++ b/src/jinjax/html_attrs.py
@@ -0,0 +1,348 @@
+import re
+import typing as t
+from collections import UserString
+from functools import cached_property
+
+from markupsafe import Markup
+
+
+CLASS_KEY = "class"
+CLASS_ALT_KEY = "classes"
+CLASS_KEYS = (CLASS_KEY, CLASS_ALT_KEY)
+
+
+def split(ssl: str) -> list[str]:
+    return re.split(r"\s+", ssl.strip())
+
+
+def quote(text: str) -> str:
+    if '"' in text:
+        if "'" in text:
+            text = text.replace('"', "&quot;")
+            return f'"{text}"'
+        else:
+            return f"'{text}'"
+
+    return f'"{text}"'
+
+
+class LazyString(UserString):
+    """
+    Behave like regular strings, but the actual casting of the initial value
+    is deferred until the value is actually required.
+    """
+
+    __slots__ = ("_seq",)
+
+    def __init__(self, seq):
+        self._seq = seq
+
+    @cached_property
+    def data(self):  # type: ignore
+        return str(self._seq)
+
+
+class HTMLAttrs:
+    """
+    Contains all the HTML attributes/properties (a property is an
+    attribute without a value) passed to a component but that weren't
+    in the declared attributes list.
+
+    For HTML classes you can use the name "classes" (instead of "class")
+    if you need to.
+
+    **NOTE**: The string values passed to this class, are not cast to `str` until
+    the string representation is actually needed, for example when
+    `attrs.render()` is invoked.
+
+    """
+
+    def __init__(self, attrs: "dict[str, t.Any| LazyString]") -> None:
+        attributes: "dict[str, str | LazyString]" = {}
+        properties: set[str] = set()
+
+        class_names = split(" ".join([
+            str(attrs.pop(CLASS_KEY, "")),
+            str(attrs.get(CLASS_ALT_KEY, "")),
+        ]))
+        self.__classes = {name for name in class_names if name}
+
+        for name, value in attrs.items():
+            name = name.replace("_", "-")
+            if value is True:
+                properties.add(name)
+            elif value is not False and value is not None:
+                attributes[name] = LazyString(value)
+
+        self.__attributes = attributes
+        self.__properties = properties
+
+    @property
+    def classes(self) -> str:
+        """
+        All the HTML classes alphabetically sorted and separated by a space.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"class": "italic bold bg-blue wide abcde"})
+            attrs.set(class="bold text-white")
+            print(attrs.classes)
+            abcde bg-blue bold italic text-white wide
+            ```
+
+        """
+        return " ".join(sorted((self.__classes)))
+
+    @property
+    def as_dict(self) -> dict[str, t.Any]:
+        """
+        An ordered dict of all the attributes and properties, both
+        sorted by name before join.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({
+            "class": "lorem ipsum",
+            "data_test": True,
+            "hidden": True,
+            "aria_label": "hello",
+            "id": "world",
+            })
+            attrs.as_dict
+            {
+                "aria_label": "hello",
+                "class": "ipsum lorem",
+                "id": "world",
+                "data_test": True,
+                "hidden": True
+            }
+            ```
+
+        """
+        attributes = self.__attributes.copy()
+        classes = self.classes
+        if classes:
+            attributes[CLASS_KEY] = classes
+
+        out: dict[str, t.Any] = dict(sorted(attributes.items()))
+        for name in sorted((self.__properties)):
+            out[name] = True
+        return out
+
+    def __getitem__(self, name: str) -> t.Any:
+        return self.get(name)
+
+    def __delitem__(self, name: str) -> None:
+        self._remove(name)
+
+    def __str__(self) -> str:
+        return str(self.as_dict)
+
+    def set(self, **kw) -> None:
+        """
+        Sets an attribute or property
+
+        - Pass a name and a value to set an attribute (e.g. `type="text"`)
+        - Use `True` as a value to set a property (e.g. `disabled`)
+        - Use `False` to remove an attribute or property
+        - If the attribute is "class", the new classes are appended to
+          the old ones (if not repeated) instead of replacing them.
+        - The underscores in the names will be translated automatically to dashes,
+          so `aria_selected` becomes the attribute `aria-selected`.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"secret": "qwertyuiop"})
+            attrs.set(secret=False)
+            attrs.as_dict
+            {}
+
+            attrs.set(unknown=False, lorem="ipsum", count=42, data_good=True)
+            attrs.as_dict
+            {"count":42, "lorem":"ipsum", "data_good": True}
+
+            attrs = HTMLAttrs({"class": "b c a"})
+            attrs.set(class="c b f d e")
+            attrs.as_dict
+            {"class": "a b c d e f"}
+            ```
+
+        """
+        for name, value in kw.items():
+            name = name.replace("_", "-")
+            if value is False or value is None:
+                self._remove(name)
+                continue
+
+            if name in CLASS_KEYS:
+                self.add_class(value)
+            elif value is True:
+                self.__properties.add(name)
+            else:
+                self.__attributes[name] = value
+
+    def setdefault(self, **kw) -> None:
+        """
+        Adds an attribute, but only if it's not already present.
+
+        The underscores in the names will be translated automatically to dashes,
+        so `aria_selected` becomes the attribute `aria-selected`.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"lorem": "ipsum"})
+            attrs.setdefault(tabindex=0, lorem="meh")
+            attrs.as_dict
+            # "tabindex" changed but "lorem" didn't
+            {"lorem": "ipsum", tabindex: 0}
+            ```
+
+        """
+        for name, value in kw.items():
+            if value in (True, False, None):
+                continue
+
+            if name in CLASS_KEYS:
+                if not self.__classes:
+                    self.add_class(value)
+
+            name = name.replace("_", "-")
+            if name not in self.__attributes:
+                self.set(**{name: value})
+
+    def add_class(self, *values: str) -> None:
+        """
+        Adds one or more classes to the list of classes, if not already present.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"class": "a b c"})
+            attrs.add_class("c", "d")
+            attrs.as_dict
+            {"class": "a b c d"}
+            ```
+
+        """
+        for names in values:
+            for name in split(names):
+                self.__classes.add(name)
+
+    def remove_class(self, *names: str) -> None:
+        """
+        Removes one or more classes from the list of classes.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"class": "a b c"})
+            attrs.remove_class("c", "d")
+            attrs.as_dict
+            {"class": "a b"}
+            ```
+
+        """
+        for name in names:
+            self.__classes.remove(name)
+
+    def get(self, name: str, default: t.Any = None) -> t.Any:
+        """
+        Returns the value of the attribute or property,
+        or the default value if it doesn't exists.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"lorem": "ipsum", "hidden": True})
+
+            attrs.get("lorem", defaut="bar")
+            'ipsum'
+
+            attrs.get("foo")
+            None
+
+            attrs.get("foo", defaut="bar")
+            'bar'
+
+            attrs.get("hidden")
+            True
+            ```
+
+        """
+        name = name.replace("_", "-")
+        if name in CLASS_KEYS:
+            return self.classes
+        if name in self.__attributes:
+            return self.__attributes[name]
+        if name in self.__properties:
+            return True
+        return default
+
+    def render(self, **kw) -> str:
+        """
+        Renders the attributes and properties as a string.
+
+        Any arguments you use with this function are merged with the existing
+        attibutes/properties by the same rules as the `HTMLAttrs.set()` function:
+
+        - Pass a name and a value to set an attribute (e.g. `type="text"`)
+        - Use `True` as a value to set a property (e.g. `disabled`)
+        - Use `False` to remove an attribute or property
+        - If the attribute is "class", the new classes are appended to
+          the old ones (if not repeated) instead of replacing them.
+        - The underscores in the names will be translated automatically to dashes,
+          so `aria_selected` becomes the attribute `aria-selected`.
+
+        To provide consistent output, the attributes and properties
+        are sorted by name and rendered like this:
+        `<sorted attributes> + <sorted properties>`.
+
+        Example:
+
+            ```python
+            attrs = HTMLAttrs({"class": "ipsum", "data_good": True, "width": 42})
+
+            attrs.render()
+            'class="ipsum" width="42" data-good'
+
+            attrs.render(class="abc", data_good=False, tabindex=0)
+            'class="abc ipsum" width="42" tabindex="0"'
+            ```
+
+        """
+        if kw:
+            self.set(**kw)
+
+        attributes = self.__attributes.copy()
+
+        classes = self.classes
+        if classes:
+            attributes[CLASS_KEY] = classes
+
+        attributes = dict(sorted(attributes.items()))
+        properties = sorted((self.__properties))
+
+        html_attrs = [
+            f"{name}={quote(str(value))}"
+            for name, value in attributes.items()
+        ]
+        html_attrs.extend(properties)
+
+        return Markup(" ".join(html_attrs))
+
+    # Private
+
+    def _remove(self, name: str) -> None:
+        """
+        Removes an attribute or property.
+        """
+        if name in CLASS_KEYS:
+            self.__classes = set()
+        if name in self.__attributes:
+            del self.__attributes[name]
+        if name in self.__properties:
+            self.__properties.remove(name)
diff --git a/src/jinjax/jinjax.py b/src/jinjax/jinjax.py
new file mode 100644
index 0000000..b7a9783
--- /dev/null
+++ b/src/jinjax/jinjax.py
@@ -0,0 +1,161 @@
+import re
+import typing as t
+from uuid import uuid4
+
+from jinja2.exceptions import TemplateSyntaxError
+from jinja2.ext import Extension
+from jinja2.filters import do_forceescape
+
+from .utils import logger
+
+
+RENDER_CMD = "catalog.irender"
+BLOCK_CALL = '{% call(_slot) [CMD]("[TAG]"[ATTRS]) -%}[CONTENT]{%- endcall %}'
+BLOCK_CALL = BLOCK_CALL.replace("[CMD]", RENDER_CMD)
+INLINE_CALL = '{{ [CMD]("[TAG]"[ATTRS]) }}'
+INLINE_CALL = INLINE_CALL.replace("[CMD]", RENDER_CMD)
+
+re_raw = r"\{%-?\s*raw\s*-?%\}.+?\{%-?\s*endraw\s*-?%\}"
+RX_RAW = re.compile(re_raw, re.DOTALL)
+
+re_tag_name = r"([0-9A-Za-z_-]+\.)*[A-Z][0-9A-Za-z_-]*"
+re_raw_attrs = r"(?P<attrs>[^\>]*)"
+re_tag = rf"<(?P<tag>{re_tag_name}){re_raw_attrs}\s*/?>"
+RX_TAG = re.compile(re_tag)
+
+re_attr_name = r""
+re_equal = r""
+re_attr = r"""
+(?P<name>[a-zA-Z@:$_][a-zA-Z@:$_0-9-]*)
+(?:
+    \s*=\s*
+    (?P<value>".*?"|'.*?'|\{\{.*?\}\})
+)?
+(?:\s+|/|"|$)
+"""
+RX_ATTR = re.compile(re_attr, re.VERBOSE | re.DOTALL)
+
+
+class JinjaX(Extension):
+    def preprocess(
+        self,
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> str:
+        self.__raw_blocks = {}
+        self._name = name
+        self._filename = filename
+        source = self._replace_raw_blocks(source)
+        source = self._process_tags(source)
+        source = self._restore_raw_blocks(source)
+        self.__raw_blocks = {}
+        return source
+
+    def _replace_raw_blocks(self, source: str) -> str:
+        while True:
+            match = RX_RAW.search(source)
+            if not match:
+                break
+            start, end = match.span(0)
+            repl = self._replace_raw_block(match)
+            source = f"{source[:start]}{repl}{source[end:]}"
+
+        return source
+
+    def _replace_raw_block(self, match: re.Match) -> str:
+        uid = f"--RAW-{uuid4().hex}--"
+        self.__raw_blocks[uid] = do_forceescape(match.group(0))
+        return uid
+
+    def _restore_raw_blocks(self, source: str) -> str:
+        for uid, code in self.__raw_blocks.items():
+            source = source.replace(uid, code)
+        return source
+
+    def _process_tags(self, source: str) -> str:
+        while True:
+            match = RX_TAG.search(source)
+            if not match:
+                break
+            source = self._process_tag(source, match)
+        return source
+
+    def _process_tag(self, source: str, match: re.Match) -> str:
+        start, end = match.span(0)
+        tag = match.group("tag")
+        attrs = (match.group("attrs") or "").strip()
+        inline = match.group(0).endswith("/>")
+        lineno = source[:start].count("\n") + 1
+
+        logger.debug(f"{tag} {attrs} {'inline' if not inline else ''}")
+        if inline:
+            content = ""
+        else:
+            end_tag = f"</{tag}>"
+            index = source.find(end_tag, end, None)
+            if index == -1:
+                raise TemplateSyntaxError(
+                    message=f"Unclosed component {match.group(0)}",
+                    lineno=lineno,
+                    name=self._name,
+                    filename=self._filename
+                )
+            content = source[end:index]
+            end = index + len(end_tag)
+
+        attrs_list = self._parse_attrs(attrs)
+        repl = self._build_call(tag, attrs_list, content)
+
+        return f"{source[:start]}{repl}{source[end:]}"
+
+    def _parse_attrs(self, attrs: str) -> list[tuple[str, str]]:
+        attrs = attrs.replace("\n", " ").strip()
+        if not attrs:
+            return []
+        return RX_ATTR.findall(attrs)
+
+    def _build_call(
+        self,
+        tag: str,
+        attrs_list: list[tuple[str, str]],
+        content: str = "",
+    ) -> str:
+        logger.debug(f"{tag} {attrs_list} {'inline' if not content else ''}")
+        attrs = []
+        for name, value in attrs_list:
+            name = name.strip().replace("-", "_")
+            value = value.strip()
+
+            if not value:
+                name = name.lstrip(":")
+                attrs.append(f'"{name}"=True')
+            else:
+                # vue-like syntax
+                if (
+                    name[0] == ":"
+                    and value[0] in ("\"'")
+                    and value[-1] in ("\"'")
+                ):
+                    value = value[1:-1].strip()
+
+                # double curly braces syntax
+                if value[:2] == "{{" and value[-2:] == "}}":
+                    value = value[2:-2].strip()
+
+                name = name.lstrip(":")
+                attrs.append(f'"{name}"={value}')
+
+        str_attrs = "**{" + ", ".join([a.replace("=", ":", 1) for a in attrs]) + "}"
+        if str_attrs:
+            str_attrs = f", {str_attrs}"
+
+        if not content:
+            call = INLINE_CALL.replace("[TAG]", tag).replace("[ATTRS]", str_attrs)
+        else:
+            call = (
+                BLOCK_CALL.replace("[TAG]", tag)
+                .replace("[ATTRS]", str_attrs)
+                .replace("[CONTENT]", content)
+            )
+        return call
diff --git a/src/jinjax/middleware.py b/src/jinjax/middleware.py
new file mode 100644
index 0000000..7c8acd8
--- /dev/null
+++ b/src/jinjax/middleware.py
@@ -0,0 +1,39 @@
+import re
+import typing as t
+from pathlib import Path
+
+from whitenoise import WhiteNoise
+from whitenoise.responders import Redirect, StaticFile
+
+
+RX_FINGERPRINT = re.compile("(.*)-([abcdef0-9]{64})")
+
+
+class ComponentsMiddleware(WhiteNoise):
+    """WSGI middleware for serving components assets"""
+    allowed_ext: tuple[str, ...]
+
+    def __init__(self, **kwargs) -> None:
+        self.allowed_ext = kwargs.pop("allowed_ext", ())
+        super().__init__(**kwargs)
+
+    def find_file(self, url: str) -> "StaticFile | Redirect | None":
+
+        if self.allowed_ext and not url.endswith(self.allowed_ext):
+            return None
+
+        # Ignore the fingerprint in the filename
+        # since is only for managing the cache in the client
+        relpath = Path(url)
+        ext = "".join(relpath.suffixes)
+        stem = relpath.name.removesuffix(ext)
+        fingerprinted = RX_FINGERPRINT.match(stem)
+        if fingerprinted:
+            stem = fingerprinted.group(1)
+            relpath = relpath.with_name(f"{stem}{ext}")
+
+        return super().find_file(str(relpath))
+
+    def add_file_to_dictionary(self, url: str, path: str, stat_cache: t.Any = None) -> None:
+        if not self.allowed_ext or url.endswith(self.allowed_ext):
+            super().add_file_to_dictionary(url, path, stat_cache)
diff --git a/src/jinjax/py.typed b/src/jinjax/py.typed
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/jinjax/py.typed
diff --git a/src/jinjax/utils.py b/src/jinjax/utils.py
new file mode 100644
index 0000000..ff1ca4f
--- /dev/null
+++ b/src/jinjax/utils.py
@@ -0,0 +1,16 @@
+import logging
+
+
+logger = logging.getLogger("jinjax")
+
+DELIMITER = "."
+SLASH = "/"
+
+
+def get_url_prefix(prefix: str) -> str:
+    url_prefix = (
+        prefix.strip().strip(f"{DELIMITER}{SLASH}").replace(DELIMITER, SLASH)
+    )
+    if url_prefix:
+        url_prefix = f"{url_prefix}{SLASH}"
+    return url_prefix
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..6256373
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,24 @@
+import pytest
+
+import jinjax
+
+
+@pytest.fixture()
+def folder(tmp_path):
+    d = tmp_path / "components"
+    d.mkdir()
+    return d
+
+
+@pytest.fixture()
+def folder_t(tmp_path):
+    d = tmp_path / "templates"
+    d.mkdir()
+    return d
+
+
+@pytest.fixture()
+def catalog(folder):
+    catalog = jinjax.Catalog(auto_reload=False)
+    catalog.add_folder(folder)
+    return catalog
diff --git a/tests/test_catalog.py b/tests/test_catalog.py
new file mode 100644
index 0000000..d3c4bc0
--- /dev/null
+++ b/tests/test_catalog.py
@@ -0,0 +1,88 @@
+import pytest
+
+import jinjax
+
+
+def test_add_folder_with_default_prefix():
+    catalog = jinjax.Catalog()
+    catalog.add_folder("file_path")
+
+    assert "file_path" in catalog.prefixes[""].searchpath
+
+
+def test_add_folder_with_custom_prefix():
+    catalog = jinjax.Catalog()
+    catalog.add_folder("file_path", prefix="custom")
+
+    assert "file_path" in catalog.prefixes["custom"].searchpath
+
+
+def test_add_folder_with_dirty_prefix():
+    catalog = jinjax.Catalog()
+    catalog.add_folder("file_path", prefix="/custom.")
+
+    assert "/custom." not in catalog.prefixes
+    assert "file_path" in catalog.prefixes["custom"].searchpath
+
+
+def test_add_folders_with_same_prefix():
+    catalog = jinjax.Catalog()
+    catalog.add_folder("file_path1", prefix="custom")
+    catalog.add_folder("file_path2", prefix="custom")
+
+    assert "file_path1" in catalog.prefixes["custom"].searchpath
+    assert "file_path2" in catalog.prefixes["custom"].searchpath
+
+
+def test_add_same_folder_in_same_prefix_does_nothing():
+    catalog = jinjax.Catalog()
+    catalog.add_folder("file_path", prefix="custom")
+    catalog.add_folder("file_path", prefix="custom")
+
+    assert catalog.prefixes["custom"].searchpath.count("file_path") == 1
+
+
+def test_add_module_legacy():
+    class Module:
+        components_path = "legacy_path"
+        prefix = "legacy"
+
+    catalog = jinjax.Catalog()
+    module = Module()
+    catalog.add_module(module)
+
+    assert "legacy_path" in catalog.prefixes["legacy"].searchpath
+
+
+def test_add_module_legacy_with_default_prefix():
+    class Module:
+        components_path = "legacy_path"
+
+    catalog = jinjax.Catalog()
+    module = Module()
+    catalog.add_module(module)
+
+    assert "legacy_path" in catalog.prefixes[""].searchpath
+
+
+def test_add_module_legacy_with_custom_prefix():
+    class Module:
+        components_path = "legacy_path"
+        prefix = "legacy"
+
+    catalog = jinjax.Catalog()
+    module = Module()
+    catalog.add_module(module, prefix="custom")
+
+    assert "legacy" not in catalog.prefixes
+    assert "legacy_path" in catalog.prefixes["custom"].searchpath
+
+
+def test_add_module_fails_with_other_modules():
+    class Module:
+        pass
+
+    catalog = jinjax.Catalog()
+    module = Module()
+    with pytest.raises(AttributeError):
+        catalog.add_module(module)
diff --git a/tests/test_component.py b/tests/test_component.py
new file mode 100644
index 0000000..9961b21
--- /dev/null
+++ b/tests/test_component.py
@@ -0,0 +1,315 @@
+import pytest
+
+from jinjax import Component, DuplicateDefDeclaration, InvalidArgument
+
+
+def test_load_args():
+    com = Component(
+        name="Test.jinja",
+        source='{#def message, lorem=4, ipsum="bar" -#}\n',
+    )
+    assert com.required == ["message"]
+    assert com.optional == {
+        "lorem": 4,
+        "ipsum": "bar",
+    }
+
+
+def test_expression_args():
+    com = Component(
+        name="Test.jinja",
+        source="{#def expr=1 + 2 + 3, a=1 -#}\n",
+    )
+    assert com.required == []
+    assert com.optional == {
+        "expr": 6,
+        "a": 1,
+    }
+
+
+def test_dict_args():
+    com = Component(
+        name="Test.jinja",
+        source="{#def expr={'a': 'b', 'c': 'd'} -#}\n",
+    )
+    assert com.optional == {
+        "expr": {"a": "b", "c": "d"},
+    }
+
+    com = Component(
+        name="Test.jinja",
+        source='{#def a=1, expr={"a": "b", "c": "d"} -#}\n',
+    )
+    assert com.optional == {
+        "a": 1,
+        "expr": {"a": "b", "c": "d"},
+    }
+
+
+def test_lowercase_booleans():
+    com = Component(
+        name="Test.jinja",
+        source="{#def a=false, b=true -#}\n",
+    )
+    assert com.optional == {
+        "a": False,
+        "b": True,
+    }
+
+
+def test_no_args():
+    com = Component(
+        name="Test.jinja",
+        source="\n",
+    )
+    assert com.required == []
+    assert com.optional == {}
+
+
+def test_fails_when_invalid_name():
+    with pytest.raises(InvalidArgument):
+        source = "{#def 000abc -#}\n"
+        co = Component(name="", source=source)
+        print(co.required, co.optional)
+
+
+def test_fails_when_missing_comma_between_args():
+    with pytest.raises(InvalidArgument):
+        source = "{#def lorem ipsum -#}\n"
+        co = Component(name="", source=source)
+        print(co.required, co.optional)
+
+
+def test_fails_when_missing_quotes_arround_default_value():
+    with pytest.raises(InvalidArgument):
+        source = "{#def lorem=ipsum -#}\n"
+        co = Component(name="", source=source)
+        print(co.required, co.optional)
+
+
+def test_fails_when_prop_is_expression():
+    with pytest.raises(InvalidArgument):
+        source = "{#def a-b -#}\n"
+        co = Component(name="", source=source)
+        print(co.required, co.optional)
+
+
+def test_fails_when_extra_comma_between_args():
+    with pytest.raises(InvalidArgument):
+        source = "{#def a, , b -#}\n"
+        co = Component(name="", source=source)
+        print(co.required, co.optional)
+
+
+def test_comma_in_default_value():
+    com = Component(
+        name="Test.jinja",
+        source="{#def a='lorem, ipsum' -#}\n",
+    )
+    assert com.optional == {"a": "lorem, ipsum"}
+
+
+def test_load_assets():
+    com = Component(
+        name="Test.jinja",
+        url_prefix="/static/",
+        source="""
+        {#css a.css, "b.css", c.css -#}
+        {#js a.js, b.js, c.js -#}
+        """,
+    )
+    assert com.css == ["/static/a.css", "/static/b.css", "/static/c.css"]
+    assert com.js == ["/static/a.js", "/static/b.js", "/static/c.js"]
+
+
+def test_no_comma_in_assets_list_is_your_problem():
+    com = Component(
+        name="Test.jinja",
+        source="{#js a.js b.js c.js -#}\n",
+        url_prefix="/static/"
+    )
+    assert com.js == ["/static/a.js b.js c.js"]
+
+
+def test_load_metadata_in_any_order():
+    com = Component(
+        name="Test.jinja",
+        source="""
+        {#css a.css #}
+        {#def lorem, ipsum=4 #}
+        {#js a.js #}
+        """,
+    )
+    assert com.required == ["lorem"]
+    assert com.optional == {"ipsum": 4}
+    assert com.css == ["a.css"]
+    assert com.js == ["a.js"]
+
+
+def test_ignore_metadata_if_not_first():
+    com = Component(
+        name="Test.jinja",
+        source="""
+        I am content
+        {#css a.css #}
+        {#def lorem, ipsum=4 #}
+        {#js a.js #}
+        """,
+    )
+    assert com.required == []
+    assert com.optional == {}
+    assert com.css == []
+    assert com.js == []
+
+
+def test_fail_with_more_than_one_args_declaration():
+    with pytest.raises(DuplicateDefDeclaration):
+        Component(
+            name="Test.jinja",
+            source="""
+            {#def lorem, ipsum=4 #}
+            {#def a, b, c, ipsum="nope" #}
+            """,
+        )
+
+
+def test_merge_repeated_css_or_js_declarations():
+    com = Component(
+        name="Test.jinja",
+        source="""
+        {#css a.css #}
+        {#def lorem, ipsum=4 #}
+        {#css b.css #}
+        {#js a.js #}
+        {#js b.js #}
+        """,
+    )
+    assert com.required == ["lorem"]
+    assert com.optional == {"ipsum": 4}
+    assert com.css == ["a.css", "b.css"]
+    assert com.js == ["a.js", "b.js"]
+
+
+def test_linejump_in_args_decl():
+    com = Component(
+        name="Test.jinja",
+        source='{#def\n  message,\n  lorem=4,\n  ipsum="bar"\n#}\n',
+    )
+    assert com.required == ["message"]
+    assert com.optional == {
+        "lorem": 4,
+        "ipsum": "bar",
+    }
+
+
+def test_global_assets():
+    com = Component(
+        name="Test.jinja",
+        source="""
+        {#css a.css, /static/shared/b.css, http://example.com/cdn.css #}
+        {#js "http://example.com/cdn.js", a.js, /static/shared/b.js #}
+        """,
+    )
+    assert com.css == ["a.css", "/static/shared/b.css", "http://example.com/cdn.css"]
+    assert com.js == ["http://example.com/cdn.js", "a.js", "/static/shared/b.js"]
+
+
+def test_types_in_args_decl():
+    com = Component(
+        name="Test.jinja",
+        source="""{# def
+  ring_class: str = "ring-1 ring-black",
+  rounded_class: str = "rounded-2xl md:rounded-3xl",
+
+  image: str | None = None,
+
+  title: str = "",
+  p_class: str = "px-5 md:px-6 py-5 md:py-6",
+  gap_class: str = "gap-4",
+  content_class: str = "",
+
+  layer_class: str | None = None,
+  layer_height: int = 4,
+#}"""
+    )
+    assert com.required == []
+    print(com.optional)
+    assert com.optional == {
+        "ring_class": "ring-1 ring-black",
+        "rounded_class": "rounded-2xl md:rounded-3xl",
+        "image": None,
+        "title": "",
+        "p_class": "px-5 md:px-6 py-5 md:py-6",
+        "gap_class": "gap-4",
+        "content_class": "",
+        "layer_class": None,
+        "layer_height": 4,
+    }
+
+
+def test_comments_in_args_decl():
+    com = Component(
+        name="Test.jinja",
+        source="""{# def
+  #
+  # Card style
+  ring_class: str = "ring-1 ring-black",
+  rounded_class: str = "rounded-2xl md:rounded-3xl",
+  #
+  # Image
+  image: str | None = None,
+  #
+  # Content
+  title: str = "",
+  p_class: str = "px-5 md:px-6 py-5 md:py-6",
+  gap_class: str = "gap-4",
+  content_class: str = "",
+  #
+  # Decorative layer
+  layer_class: str | None = None,
+  layer_height: int = 4,
+#}"""
+    )
+    assert com.required == []
+    print(com.optional)
+    assert com.optional == {
+        "ring_class": "ring-1 ring-black",
+        "rounded_class": "rounded-2xl md:rounded-3xl",
+        "image": None,
+        "title": "",
+        "p_class": "px-5 md:px-6 py-5 md:py-6",
+        "gap_class": "gap-4",
+        "content_class": "",
+        "layer_class": None,
+        "layer_height": 4,
+    }
+
+
+def test_comment_after_args_decl():
+    com = Component(
+        name="Test.jinja",
+        source="""
+{# def
+  arg,
+#}
+
+{#
+  Some comment.
+#}
+Hi
+""".strip())
+    assert com.required == ["arg"]
+    assert com.optional == {}
+
+
+def test_fake_decl():
+    com = Component(
+        name="Test.jinja",
+        source="""
+{# definitely not an args decl! #}
+{# def arg #}
+{# jsadfghkl are letters #}
+{# csssssss #}
+""".strip())
+    assert com.required == ["arg"]
+    assert com.optional == {}
diff --git a/tests/test_html_attrs.py b/tests/test_html_attrs.py
new file mode 100644
index 0000000..bc1a68f
--- /dev/null
+++ b/tests/test_html_attrs.py
@@ -0,0 +1,281 @@
+import pytest
+
+from jinjax.html_attrs import HTMLAttrs
+
+
+def test_parse_initial_attrs():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "data-position": "top",
+            "class": "z4 c3 a1 z4 b2",
+            "open": True,
+            "disabled": False,
+            "value": 0,
+            "foobar": None,
+        }
+    )
+    assert attrs.classes == "a1 b2 c3 z4"
+    assert attrs.get("class") == "a1 b2 c3 z4"
+    assert attrs.get("data-position") == "top"
+    assert attrs.get("data_position") == "top"
+    assert attrs.get("title") == "hi"
+    assert attrs.get("open") is True
+    assert attrs.get("disabled", "meh") == "meh"
+    assert attrs.get("value") == "0"
+
+    assert attrs.get("disabled") is None
+    assert attrs.get("foobar") is None
+
+    attrs.set(data_value=0)
+    attrs.set(data_position=False)
+    assert attrs.get("data-value") == 0
+    assert attrs.get("data-position") is None
+    assert attrs.get("data_position") is None
+
+def test_getattr():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "class": "z4 c3 a1 z4 b2",
+            "open": True,
+        }
+    )
+    assert attrs["class"] == "a1 b2 c3 z4"
+    assert attrs["title"] == "hi"
+    assert attrs["open"] is True
+    assert attrs["lorem"] is None
+
+
+def test_deltattr():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "class": "z4 c3 a1 z4 b2",
+            "open": True,
+        }
+    )
+    assert attrs["class"] == "a1 b2 c3 z4"
+    del attrs["title"]
+    assert attrs["title"] is None
+
+
+def test_render():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "data-position": "top",
+            "class": "z4 c3 a1 z4 b2",
+            "open": True,
+            "disabled": False,
+        }
+    )
+    assert 'class="a1 b2 c3 z4" data-position="top" title="hi" open' == attrs.render()
+
+
+def test_set():
+    attrs = HTMLAttrs({})
+    attrs.set(title="hi", data_position="top")
+    attrs.set(open=True)
+    assert 'data-position="top" title="hi" open' == attrs.render()
+
+    attrs.set(title=False, open=False)
+    assert 'data-position="top"' == attrs.render()
+
+
+def test_class_management():
+    attrs = HTMLAttrs(
+        {
+            "class": "z4 c3 a1 z4 b2",
+        }
+    )
+    attrs.set(classes="lorem bipsum lorem a1")
+
+    assert attrs.classes == "a1 b2 bipsum c3 lorem z4"
+
+    attrs.remove_class("bipsum")
+    assert attrs.classes == "a1 b2 c3 lorem z4"
+
+    attrs.set(classes=None)
+    attrs.set(classes="meh")
+    assert attrs.classes == "meh"
+
+
+def test_setdefault():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+        }
+    )
+    attrs.setdefault(
+        title="default title",
+        data_lorem="ipsum",
+        open=True,
+        disabled=False,
+    )
+    assert 'data-lorem="ipsum" title="hi"' == attrs.render()
+
+
+def test_as_dict():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "data-position": "top",
+            "class": "z4 c3 a1 z4 b2",
+            "open": True,
+            "disabled": False,
+        }
+    )
+    assert attrs.as_dict == {
+        "class": "a1 b2 c3 z4",
+        "data-position": "top",
+        "title": "hi",
+        "open": True,
+    }
+
+
+def test_as_dict_no_classes():
+    attrs = HTMLAttrs(
+        {
+            "title": "hi",
+            "data-position": "top",
+            "open": True,
+        }
+    )
+    assert attrs.as_dict == {
+        "data-position": "top",
+        "title": "hi",
+        "open": True,
+    }
+
+
+def test_render_attrs_lik_set():
+    attrs = HTMLAttrs({"class": "lorem"})
+    expected = 'class="ipsum lorem" data-position="top" title="hi" open'
+    result = attrs.render(
+        title="hi",
+        data_position="top",
+        classes="ipsum",
+        open=True,
+    )
+    print(result)
+    assert expected == result
+
+
+def test_do_not_escape_tailwind_syntax():
+    attrs = HTMLAttrs({"class": "lorem [&_a]:flex"})
+    expected = 'class="[&_a]:flex ipsum lorem" title="Hi&Stuff"'
+    result = attrs.render(
+        **{
+            "title": "Hi&Stuff",
+            "class": "ipsum",
+        }
+    )
+    print(result)
+    assert expected == result
+
+
+def test_do_escape_quotes_inside_attrs():
+    attrs = HTMLAttrs(
+        {
+            "class": "lorem text-['red']",
+            "title": 'I say "hey"',
+            "open": True,
+        }
+    )
+    expected = """class="lorem text-['red']" title='I say "hey"' open"""
+    result = attrs.render()
+    print(result)
+    assert expected == result
+
+
+def test_additional_attributes_are_lazily_evaluated_to_strings():
+    class TestObject:
+        def __str__(self):
+            raise RuntimeError("Should not be called unless rendered.")
+
+    attrs = HTMLAttrs(
+        {
+            "some_object": TestObject(),
+        }
+    )
+
+    with pytest.raises(RuntimeError):
+        attrs.render()
+
+
+def test_additional_attributes_lazily_evaluated_has_string_methods():
+    class TestObject:
+        def __str__(self):
+            return "test"
+
+    attrs = HTMLAttrs({"some_object": TestObject()})
+
+    assert attrs["some_object"].__str__
+    assert attrs["some_object"].__repr__
+    assert attrs["some_object"].__int__
+    assert attrs["some_object"].__float__
+    assert attrs["some_object"].__complex__
+    assert attrs["some_object"].__hash__
+    assert attrs["some_object"].__eq__
+    assert attrs["some_object"].__lt__
+    assert attrs["some_object"].__le__
+    assert attrs["some_object"].__gt__
+    assert attrs["some_object"].__ge__
+    assert attrs["some_object"].__contains__
+    assert attrs["some_object"].__len__
+    assert attrs["some_object"].__getitem__
+    assert attrs["some_object"].__add__
+    assert attrs["some_object"].__radd__
+    assert attrs["some_object"].__mul__
+    assert attrs["some_object"].__mod__
+    assert attrs["some_object"].__rmod__
+    assert attrs["some_object"].capitalize
+    assert attrs["some_object"].casefold
+    assert attrs["some_object"].center
+    assert attrs["some_object"].count
+    assert attrs["some_object"].removeprefix
+    assert attrs["some_object"].removesuffix
+    assert attrs["some_object"].encode
+    assert attrs["some_object"].endswith
+    assert attrs["some_object"].expandtabs
+    assert attrs["some_object"].find
+    assert attrs["some_object"].format
+    assert attrs["some_object"].format_map
+    assert attrs["some_object"].index
+    assert attrs["some_object"].isalpha
+    assert attrs["some_object"].isalnum
+    assert attrs["some_object"].isascii
+    assert attrs["some_object"].isdecimal
+    assert attrs["some_object"].isdigit
+    assert attrs["some_object"].isidentifier
+    assert attrs["some_object"].islower
+    assert attrs["some_object"].isnumeric
+    assert attrs["some_object"].isprintable
+    assert attrs["some_object"].isspace
+    assert attrs["some_object"].istitle
+    assert attrs["some_object"].isupper
+    assert attrs["some_object"].join
+    assert attrs["some_object"].ljust
+    assert attrs["some_object"].lower
+    assert attrs["some_object"].lstrip
+    assert attrs["some_object"].partition
+    assert attrs["some_object"].replace
+    assert attrs["some_object"].rfind
+    assert attrs["some_object"].rindex
+    assert attrs["some_object"].rjust
+    assert attrs["some_object"].rpartition
+    assert attrs["some_object"].rstrip
+    assert attrs["some_object"].split
+    assert attrs["some_object"].rsplit
+    assert attrs["some_object"].splitlines
+    assert attrs["some_object"].startswith
+    assert attrs["some_object"].strip
+    assert attrs["some_object"].swapcase
+    assert attrs["some_object"].title
+    assert attrs["some_object"].translate
+    assert attrs["some_object"].upper
+    assert attrs["some_object"].zfill
+
+    assert attrs["some_object"].upper() == "TEST"
+    assert attrs["some_object"].title() == "Test"
diff --git a/tests/test_middleware.py b/tests/test_middleware.py
new file mode 100644
index 0000000..b1fa9a9
--- /dev/null
+++ b/tests/test_middleware.py
@@ -0,0 +1,152 @@
+import typing as t
+from pathlib import Path
+
+import jinjax
+
+
+def application(environ, start_response) -> list[bytes]:
+    status = "200 OK"
+    headers = [("Content-type", "text/plain")]
+    start_response(status, headers)
+    return [b"NOPE"]
+
+
+def make_environ(**kw) -> dict[str, t.Any]:
+    kw.setdefault("PATH_INFO", "/")
+    kw.setdefault("REQUEST_METHOD", "GET")
+    return kw
+
+
+def mock_start_response(status: str, headers: dict[str, t.Any]):
+    pass
+
+
+def get_catalog(folder: "str | Path", **kw) -> jinjax.Catalog:
+    catalog = jinjax.Catalog(**kw)
+    catalog.add_folder(folder)
+    return catalog
+
+
+TMiddleware = t.Callable[
+    [
+        dict[str, t.Any],
+        t.Callable[[str, dict[str, t.Any]], None],
+    ],
+    t.Any
+]
+
+def run_middleware(middleware: TMiddleware, url: str):
+    return middleware(make_environ(PATH_INFO=url), mock_start_response)
+
+
+# Tests
+
+
+def test_css_is_returned(folder):
+    (folder / "page.css").write_text("/* Page.css */")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application)
+
+    resp = run_middleware(middleware, "/static/components/page.css")
+    assert resp and not isinstance(resp, list)
+    text = resp.filelike.read().strip()
+    assert text == b"/* Page.css */"
+
+
+def test_js_is_returned(folder):
+    (folder / "page.js").write_text("/* Page.js */")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application)
+
+    resp = run_middleware(middleware, "/static/components/page.js")
+    assert resp and not isinstance(resp, list)
+    text = resp.filelike.read().strip()
+    assert text == b"/* Page.js */"
+
+
+def test_other_file_extensions_ignored(folder):
+    (folder / "Page.jinja").write_text("???")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application)
+    resp = run_middleware(middleware, "/static/components/Page.jinja")
+    assert resp == [b"NOPE"]
+
+
+def test_add_custom_extensions(folder):
+    (folder / "Page.jinja").write_text("???")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application, allowed_ext=[".jinja"])
+
+    resp = run_middleware(middleware, "/static/components/Page.jinja")
+    assert resp and not isinstance(resp, list)
+    text = resp.filelike.read().strip()
+    assert text == b"???"
+
+
+def test_custom_root_url(folder):
+    (folder / "page.css").write_text("/* Page.css */")
+    catalog = get_catalog(folder, root_url="/static/co/")
+    middleware = catalog.get_middleware(application)
+
+    resp = run_middleware(middleware, "/static/co/page.css")
+    assert resp and not isinstance(resp, list)
+    text = resp.filelike.read().strip()
+    assert text == b"/* Page.css */"
+
+
+def test_autorefresh_load(folder):
+    (folder / "page.css").write_text("/* Page.css */")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application, autorefresh=True)
+
+    resp = run_middleware(middleware, "/static/components/page.css")
+    assert resp and not isinstance(resp, list)
+    text = resp.filelike.read().strip()
+    assert text == b"/* Page.css */"
+
+
+def test_autorefresh_block(folder):
+    (folder / "Page.jinja").write_text("???")
+    catalog = get_catalog(folder)
+    middleware = catalog.get_middleware(application, autorefresh=True)
+
+    resp = run_middleware(middleware, "/static/components/Page.jinja")
+    assert resp == [b"NOPE"]
+
+
+def test_multiple_folders(tmp_path):
+    folder1 = tmp_path / "folder1"
+    folder1.mkdir()
+    (folder1 / "folder1.css").write_text("folder1")
+
+    folder2 = tmp_path / "folder2"
+    folder2.mkdir()
+    (folder2 / "folder2.css").write_text("folder2")
+
+    catalog = jinjax.Catalog()
+    catalog.add_folder(folder1)
+    catalog.add_folder(folder2)
+    middleware = catalog.get_middleware(application)
+
+    resp = run_middleware(middleware, "/static/components/folder1.css")
+    assert resp.filelike.read() == b"folder1"
+    resp = run_middleware(middleware, "/static/components/folder2.css")
+    assert resp.filelike.read() == b"folder2"
+
+
+def test_multiple_folders_precedence(tmp_path):
+    folder1 = tmp_path / "folder1"
+    folder1.mkdir()
+    (folder1 / "name.css").write_text("folder1")
+
+    folder2 = tmp_path / "folder2"
+    folder2.mkdir()
+    (folder2 / "name.css").write_text("folder2")
+
+    catalog = jinjax.Catalog()
+    catalog.add_folder(folder1)
+    catalog.add_folder(folder2)
+    middleware = catalog.get_middleware(application)
+
+    resp = run_middleware(middleware, "/static/components/name.css")
+    assert resp.filelike.read() == b"folder1"
diff --git a/tests/test_render.py b/tests/test_render.py
new file mode 100644
index 0000000..1e52cda
--- /dev/null
+++ b/tests/test_render.py
@@ -0,0 +1,992 @@
+import time
+from pathlib import Path
+from textwrap import dedent
+
+import jinja2
+import pytest
+from jinja2.exceptions import TemplateSyntaxError
+from markupsafe import Markup
+
+import jinjax
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_render_simple(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text(
+        """
+{#def message #}
+<div class="greeting [&_a]:flex">{{ message }}</div>
+    """
+    )
+    html = catalog.render("Greeting", message="Hello world!")
+    assert html == Markup('<div class="greeting [&_a]:flex">Hello world!</div>')
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_render_source(catalog, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    source = '{#def message #}\n<div class="greeting [&_a]:flex">{{ message }}</div>'
+    expected = Markup('<div class="greeting [&_a]:flex">Hello world!</div>')
+
+    html = catalog.render("Greeting", message="Hello world!", _source=source)
+    assert expected == html
+
+    # Legacy
+    html = catalog.render("Greeting", message="Hello world!", __source=source)
+    assert expected == html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_render_content(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Card.jinja").write_text("""
+<section class="card">
+{{ content }}
+</section>
+    """)
+
+    content = '<button type="button">Close</button>'
+    expected = Markup(f'<section class="card">\n{content}\n</section>')
+
+    html = catalog.render("Card", _content=content)
+    print(html)
+    assert expected == html
+
+    # Legacy
+    html = catalog.render("Card", __content=content)
+    assert expected == html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+@pytest.mark.parametrize(
+    "source, expected",
+    [
+        ("<Title>Hi</Title><Title>Hi</Title>", "<h1>Hi</h1><h1>Hi</h1>"),
+        ("<Icon /><Icon />", '<i class="icon"></i><i class="icon"></i>'),
+        ("<Title>Hi</Title><Icon />", '<h1>Hi</h1><i class="icon"></i>'),
+        ("<Icon /><Title>Hi</Title>", '<i class="icon"></i><h1>Hi</h1>'),
+    ],
+)
+def test_render_mix_of_contentful_and_contentless_components(
+    catalog,
+    folder,
+    source,
+    expected,
+    autoescape,
+):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Icon.jinja").write_text('<i class="icon"></i>')
+    (folder / "Title.jinja").write_text("<h1>{{ content }}</h1>")
+    (folder / "Page.jinja").write_text(source)
+
+    html = catalog.render("Page")
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_composition(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text(
+        """
+{#def message #}
+<div class="greeting [&_a]:flex">{{ message }}</div>
+"""
+    )
+
+    (folder / "CloseBtn.jinja").write_text(
+        """
+{#def disabled=False -#}
+<button type="button"{{ " disabled" if disabled else "" }}>&times;</button>
+"""
+    )
+
+    (folder / "Card.jinja").write_text(
+        """
+<section class="card">
+{{ content }}
+<CloseBtn disabled />
+</section>
+"""
+    )
+
+    (folder / "Page.jinja").write_text(
+        """
+{#def message #}
+<Card>
+<Greeting :message="message" />
+<button type="button">Close</button>
+</Card>
+"""
+    )
+
+    html = catalog.render("Page", message="Hello")
+    print(html)
+    assert (
+        """
+<section class="card">
+<div class="greeting [&_a]:flex">Hello</div>
+<button type="button">Close</button>
+<button type="button" disabled>&times;</button>
+</section>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_just_properties(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Lorem.jinja").write_text(
+        """
+{#def ipsum=False #}
+<p>lorem {{ "ipsum" if ipsum else "lorem" }}</p>
+"""
+    )
+
+    (folder / "Layout.jinja").write_text(
+        """
+<main>
+{{ content }}
+</main>
+"""
+    )
+
+    (folder / "Page.jinja").write_text(
+        """
+<Layout>
+<Lorem ipsum />
+<p>meh</p>
+<Lorem />
+</Layout>
+"""
+    )
+
+    html = catalog.render("Page")
+    print(html)
+    assert (
+        """
+<main>
+<p>lorem ipsum</p>
+<p>meh</p>
+<p>lorem lorem</p>
+</main>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_render_assets(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text(
+        """
+{#def message #}
+{#css greeting.css, http://example.com/super.css #}
+{#js greeting.js #}
+<div class="greeting [&_a]:flex">{{ message }}</div>
+"""
+    )
+
+    (folder / "Card.jinja").write_text(
+        """
+{#css https://somewhere.com/style.css, card.css #}
+{#js card.js, shared.js #}
+<section class="card">
+{{ content }}
+</section>
+"""
+    )
+
+    (folder / "Layout.jinja").write_text(
+        """
+<html>
+{{ catalog.render_assets() }}
+{{ content }}
+</html>
+"""
+    )
+
+    (folder / "Page.jinja").write_text(
+        """
+{#def message #}
+{#js https://somewhere.com/blabla.js, shared.js #}
+<Layout>
+<Card>
+<Greeting :message="message" />
+<button type="button">Close</button>
+</Card>
+</Layout>
+"""
+    )
+
+    html = catalog.render("Page", message="Hello")
+    print(html)
+    assert (
+        """
+<html>
+<link rel="stylesheet" href="https://somewhere.com/style.css">
+<link rel="stylesheet" href="/static/components/card.css">
+<link rel="stylesheet" href="/static/components/greeting.css">
+<link rel="stylesheet" href="http://example.com/super.css">
+<script type="module" src="https://somewhere.com/blabla.js"></script>
+<script type="module" src="/static/components/shared.js"></script>
+<script type="module" src="/static/components/card.js"></script>
+<script type="module" src="/static/components/greeting.js"></script>
+<section class="card">
+<div class="greeting [&_a]:flex">Hello</div>
+<button type="button">Close</button>
+</section>
+</html>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_global_values(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Global.jinja").write_text("""{{ globalvar }}""")
+    message = "Hello world!"
+    catalog.jinja_env.globals["globalvar"] = message
+    html = catalog.render("Global")
+    print(html)
+    assert message in html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_required_attr_are_required(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text(
+        """
+{#def message #}
+<div class="greeting">{{ message }}</div>
+"""
+    )
+
+    with pytest.raises(jinjax.MissingRequiredArgument):
+        catalog.render("Greeting")
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_subfolder(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    sub = folder / "UI"
+    sub.mkdir()
+    (folder / "Meh.jinja").write_text("<UI.Tab>Meh</UI.Tab>")
+    (sub / "Tab.jinja").write_text('<div class="tab">{{ content }}</div>')
+
+    html = catalog.render("Meh")
+    assert html == Markup('<div class="tab">Meh</div>')
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_default_attr(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text(
+        """
+{#def message="Hello", world=False #}
+<div>{{ message }}{% if world %} World{% endif %}</div>
+"""
+    )
+
+    (folder / "Page.jinja").write_text(
+        """
+<Greeting />
+<Greeting message="Hi" />
+<Greeting :world="False" />
+<Greeting :world="True" />
+<Greeting world />
+"""
+    )
+
+    html = catalog.render("Page", message="Hello")
+    print(html)
+    assert (
+        """
+<div>Hello</div>
+<div>Hi</div>
+<div>Hello</div>
+<div>Hello World</div>
+<div>Hello World</div>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_raw_content(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Code.jinja").write_text("""
+<pre class="code">
+{{ content|e }}
+</pre>
+""")
+
+    (folder / "Page.jinja").write_text("""
+<Code>
+{% raw -%}
+{#def message="Hello", world=False #}
+<Header />
+<div>{{ message }}{% if world %} World{% endif %}</div>
+{%- endraw %}
+</Code>
+""")
+
+    html = catalog.render("Page")
+    print(html)
+    assert (
+        """
+<pre class="code">
+{#def message=&#34;Hello&#34;, world=False #}
+&lt;Header /&gt;
+&lt;div&gt;{{ message }}{% if world %} World{% endif %}&lt;/div&gt;
+</pre>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_multiple_raw(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "C.jinja").write_text("""
+<div {{ attrs.render() }}></div>
+""")
+
+    (folder / "Page.jinja").write_text("""
+<C id="1" />
+{% raw -%}
+<C id="2" />
+{%- endraw %}
+<C id="3" />
+{% raw %}<C id="4" />{% endraw %}
+<C id="5" />
+""")
+
+    html = catalog.render("Page", message="Hello")
+    print(html)
+    assert (
+        """
+<div id="1"></div>
+&lt;C id=&#34;2&#34; /&gt;
+<div id="3"></div>
+&lt;C id=&#34;4&#34; /&gt;
+<div id="5"></div>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_check_for_unclosed(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Lorem.jinja").write_text("""
+{#def ipsum=False #}
+<p>lorem {{ "ipsum" if ipsum else "lorem" }}</p>
+""")
+
+    (folder / "Page.jinja").write_text("""
+<main>
+<Lorem ipsum>
+</main>
+""")
+
+    with pytest.raises(TemplateSyntaxError):
+        try:
+            catalog.render("Page")
+        except TemplateSyntaxError as err:
+            print(err)
+            raise
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_dict_as_attr(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "CitiesList.jinja").write_text("""
+{#def cities #}
+{% for city, country in cities.items() -%}
+<p>{{ city }}, {{ country }}</p>
+{%- endfor %}
+""")
+
+    (folder / "Page.jinja").write_text("""
+<CitiesList :cities="{
+    'Lima': 'Peru',
+    'New York': 'USA',
+}" />
+""")
+
+    html = catalog.render("Page")
+    assert html == Markup("<p>Lima, Peru</p><p>New York, USA</p>")
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_cleanup_assets(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Layout.jinja").write_text("""
+<html>
+{{ catalog.render_assets() }}
+{{ content }}
+</html>
+""")
+
+    (folder / "Foo.jinja").write_text("""
+{#js foo.js #}
+<Layout>
+<p>Foo</p>
+</Layout>
+""")
+
+    (folder / "Bar.jinja").write_text("""
+{#js bar.js #}
+<Layout>
+<p>Bar</p>
+</Layout>
+""")
+
+    html = catalog.render("Foo")
+    print(html, "\n")
+    assert (
+        """
+<html>
+<script type="module" src="/static/components/foo.js"></script>
+<p>Foo</p>
+</html>
+""".strip()
+        in html
+    )
+
+    html = catalog.render("Bar")
+    print(html)
+    assert (
+        """
+<html>
+<script type="module" src="/static/components/bar.js"></script>
+<p>Bar</p>
+</html>
+""".strip()
+        in html
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_do_not_mess_with_external_jinja_env(folder_t, folder, autoescape):
+    """https://github.com/jpsca/jinjax/issues/19"""
+    (folder_t / "greeting.html").write_text("Jinja still works")
+    (folder / "Greeting.jinja").write_text("JinjaX works")
+
+    jinja_env = jinja2.Environment(
+        loader=jinja2.FileSystemLoader(folder_t),
+        extensions=["jinja2.ext.i18n"],
+    )
+    jinja_env.globals = {"glo": "bar"}
+    jinja_env.filters = {"fil": lambda x: x}
+    jinja_env.tests = {"tes": lambda x: x}
+    jinja_env.autoescape = autoescape
+
+    catalog = jinjax.Catalog(
+        jinja_env=jinja_env,
+        extensions=["jinja2.ext.debug"],
+        globals={"xglo": "foo"},
+        filters={"xfil": lambda x: x},
+        tests={"xtes": lambda x: x},
+    )
+    catalog.add_folder(folder)
+
+    html = catalog.render("Greeting")
+    assert html == Markup("JinjaX works")
+
+    assert catalog.jinja_env.globals["catalog"] == catalog
+    assert catalog.jinja_env.globals["glo"] == "bar"
+    assert catalog.jinja_env.globals["xglo"] == "foo"
+    assert catalog.jinja_env.filters["fil"]
+    assert catalog.jinja_env.filters["xfil"]
+    assert catalog.jinja_env.tests["tes"]
+    assert catalog.jinja_env.tests["xtes"]
+    assert "jinja2.ext.InternationalizationExtension" in catalog.jinja_env.extensions
+    assert "jinja2.ext.DebugExtension" in catalog.jinja_env.extensions
+    assert "jinja2.ext.ExprStmtExtension" in catalog.jinja_env.extensions
+
+    tmpl = jinja_env.get_template("greeting.html")
+    assert tmpl.render() == "Jinja still works"
+
+    assert jinja_env.globals["catalog"] == catalog
+    assert jinja_env.globals["glo"] == "bar"
+    assert "xglo" not in jinja_env.globals
+    assert jinja_env.filters["fil"]
+    assert "xfil" not in jinja_env.filters
+    assert jinja_env.tests["tes"]
+    assert "xtes" not in jinja_env.tests
+    assert "jinja2.ext.InternationalizationExtension" in jinja_env.extensions
+    assert "jinja2.ext.DebugExtension" not in jinja_env.extensions
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_auto_reload(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Layout.jinja").write_text("""
+<html>
+{{ content }}
+</html>
+""")
+
+    (folder / "Foo.jinja").write_text("""
+<Layout>
+<p>Foo</p>
+<Bar></Bar>
+</Layout>
+""")
+
+    bar_file = folder / "Bar.jinja"
+    bar_file.write_text("<p>Bar</p>")
+
+    html1 = catalog.render("Foo")
+    print(bar_file.stat().st_mtime)
+    print(html1, "\n")
+    assert (
+        """
+<html>
+<p>Foo</p>
+<p>Bar</p>
+</html>
+""".strip()
+        in html1
+    )
+
+    # Give it some time so the st_mtime are different
+    time.sleep(0.1)
+
+    catalog.auto_reload = False
+    bar_file.write_text("<p>Ignored</p>")
+    print(bar_file.stat().st_mtime)
+    html2 = catalog.render("Foo")
+    print(html2, "\n")
+
+    catalog.auto_reload = True
+    bar_file.write_text("<p>Updated</p>")
+    print(bar_file.stat().st_mtime)
+    html3 = catalog.render("Foo")
+    print(html3, "\n")
+
+    assert html1 == html2
+    assert (
+        """
+<html>
+<p>Foo</p>
+<p>Updated</p>
+</html>
+""".strip()
+        in html3
+    )
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_subcomponents(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    """Issue https://github.com/jpsca/jinjax/issues/32"""
+    (folder / "Page.jinja").write_text("""
+{#def message #}
+<html>
+<p>lorem ipsum</p>
+<Subcomponent />
+{{ message }}
+</html>
+""")
+
+    (folder / "Subcomponent.jinja").write_text("""
+<p>foo bar</p>
+""")
+
+    html = catalog.render("Page", message="<3")
+
+    if autoescape:
+        expected = """
+<html>
+<p>lorem ipsum</p>
+<p>foo bar</p>
+&lt;3
+</html>"""
+    else:
+        expected = """
+<html>
+<p>lorem ipsum</p>
+<p>foo bar</p>
+<3
+</html>"""
+
+    assert html == Markup(expected.strip())
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_fingerprint_assets(catalog, folder: Path, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Layout.jinja").write_text("""
+<html>
+{{ catalog.render_assets() }}
+{{ content }}
+</html>
+""")
+
+    (folder / "Page.jinja").write_text("""
+{#css app.css, http://example.com/super.css #}
+{#js app.js #}
+<Layout>Hi</Layout>
+""")
+
+    (folder / "app.css").write_text("...")
+
+    catalog.fingerprint = True
+    html = catalog.render("Page", message="Hello")
+    print(html)
+
+    assert 'src="/static/components/app.js"' in html
+    assert 'href="/static/components/app-' in html
+    assert 'href="http://example.com/super.css' in html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_colon_in_attrs(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "C.jinja").write_text("""
+<div {{ attrs.render() }}></div>
+""")
+
+    (folder / "Page.jinja").write_text("""
+<C hx-on:click="show = !show" />
+""")
+
+    html = catalog.render("Page", message="Hello")
+    print(html)
+    assert """<div hx-on:click="show = !show"></div>""" in html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_template_globals(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Input.jinja").write_text("""
+{# def name, value #}<input type="text" name="{{name}}" value="{{value}}">
+""")
+
+    (folder / "CsrfToken.jinja").write_text("""
+<input type="hidden" name="csrft" value="{{csrf_token}}">
+""")
+
+    (folder / "Form.jinja").write_text("""
+<form><CsrfToken/>{{content}}</form>
+""")
+
+    (folder / "Page.jinja").write_text("""
+{# def value #}
+<Form><Input name="foo" :value="value"/></Form>
+""")
+
+    html = catalog.render("Page", value="bar", __globals={"csrf_token": "abc"})
+    print(html)
+    assert """<input type="hidden" name="csrft" value="abc">""" in html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_template_globals_update_cache(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "CsrfToken.jinja").write_text(
+        """<input type="hidden" name="csrft" value="{{csrf_token}}">"""
+    )
+    (folder / "Page.jinja").write_text("""<CsrfToken/>""")
+
+    html = catalog.render("Page", __globals={"csrf_token": "abc"})
+    print(html)
+    assert """<input type="hidden" name="csrft" value="abc">""" in html
+
+    html = catalog.render("Page", __globals={"csrf_token": "xyz"})
+    print(html)
+    assert """<input type="hidden" name="csrft" value="xyz">""" in html
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_alpine_sintax(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Greeting.jinja").write_text("""
+{#def message #}
+<button @click="alert('{{ message }}')">Say Hi</button>""")
+
+    html = catalog.render("Greeting", message="Hello world!")
+    print(html)
+    expected = """<button @click="alert('Hello world!')">Say Hi</button>"""
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_alpine_sintax_in_component(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Button.jinja").write_text(
+        """<button {{ attrs.render() }}>{{ content }}</button>"""
+    )
+
+    (folder / "Greeting.jinja").write_text(
+        """<Button @click="alert('Hello world!')">Say Hi</Button>"""
+    )
+
+    html = catalog.render("Greeting")
+    print(html)
+    expected = """<button @click="alert('Hello world!')">Say Hi</button>"""
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_autoescaped_attrs(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "CheckboxItem.jinja").write_text(
+        """<div {{ attrs.render(class="relative") }}></div>"""
+    )
+
+    (folder / "Page.jinja").write_text(
+        """<CheckboxItem class="border border-red-500" />"""
+    )
+
+    html = catalog.render("Page")
+    print(html)
+    expected = """<div class="border border-red-500 relative"></div>"""
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize(
+    "template",
+    [
+        pytest.param(
+            dedent(
+                """
+                {# def
+                href,
+                hx_target="#maincontent",
+                hx_swap="innerHTML show:body:top",
+                hx_push_url=true,
+                #}
+                <a href="{{href}}" hx-get="{{href}}" hx-target="{{hx_target}}"
+                hx-swap="{{hx_swap}}"
+                {% if hx_push_url %}hx-push-url="true"{% endif %}>
+                {{- content -}}
+                </a>
+                """
+            ),
+            id="no comment",
+        ),
+        pytest.param(
+            dedent(
+                """
+                {# def
+                href,
+                hx_target="#maincontent",  # css selector
+                hx_swap="innerHTML show:body:top",
+                hx_push_url=true,
+                #}
+                <a href="{{href}}" hx-get="{{href}}" hx-target="{{hx_target}}"
+                hx-swap="{{hx_swap}}"
+                {% if hx_push_url %}hx-push-url="true"{% endif %}>
+                {{- content -}}
+                </a>
+                """
+            ),
+            id="comment with # on line",
+        ),
+        pytest.param(
+            dedent(
+                """
+                {# def
+                href,                               # url of the target page
+                hx_target="#maincontent",           # css selector
+                hx_swap="innerHTML show:body:top",  # browse on top of the page
+                hx_push_url=true,                   # replace the url of the browser
+                #}
+                <a href="{{href}}" hx-get="{{href}}" hx-target="{{hx_target}}"
+                hx-swap="{{hx_swap}}"
+                {% if hx_push_url %}hx-push-url="true"{% endif %}>
+                {{- content -}}
+                </a>
+                """
+            ),
+            id="many comments",
+        ),
+        pytest.param(
+            dedent(
+                """
+                {# def
+                href: str,                                 # url of the target page
+                hx_target: str = "#maincontent",           # css selector
+                hx_swap: str = "innerHTML show:body:top",  # browse on top of the page
+                hx_push_url: bool = true,                  # replace the url
+                #}
+                <a href="{{href}}" hx-get="{{href}}" hx-target="{{hx_target}}"
+                hx-swap="{{hx_swap}}"
+                {% if hx_push_url %}hx-push-url="true"{% endif %}>
+                {{- content -}}
+                </a>
+                """
+            ),
+            id="many comments and typing",
+        ),
+    ],
+)
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_strip_comment(catalog, folder, autoescape, template):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "A.jinja").write_text(template)
+
+    (folder / "Page.jinja").write_text("""<A href="/yolo">Yolo</A>""")
+
+    html = catalog.render("Page")
+    print(html)
+    expected = """
+<a href="/yolo" hx-get="/yolo" hx-target="#maincontent"
+hx-swap="innerHTML show:body:top"
+hx-push-url="true">Yolo</a>""".strip()
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_auto_load_assets_with_same_name(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Layout.jinja").write_text(
+        """{{ catalog.render_assets() }}\n{{ content }}"""
+    )
+
+    (folder / "FooBar.css").touch()
+
+    (folder / "common").mkdir()
+    (folder / "common" / "Form.jinja").write_text(
+        """
+{#js "shared.js" #}
+<form></form>"""
+    )
+
+    (folder / "common" / "Form.css").touch()
+    (folder / "common" / "Form.js").touch()
+
+    (folder / "Page.jinja").write_text(
+        """
+{#css "Page.css" #}
+<Layout><common.Form></common.Form></Layout>"""
+    )
+
+    (folder / "Page.css").touch()
+    (folder / "Page.js").touch()
+
+    html = catalog.render("Page")
+    print(html)
+
+    expected = """
+<link rel="stylesheet" href="/static/components/Page.css">
+<link rel="stylesheet" href="/static/components/common/Form.css">
+<script type="module" src="/static/components/Page.js"></script>
+<script type="module" src="/static/components/shared.js"></script>
+<script type="module" src="/static/components/common/Form.js"></script>
+<form></form>
+""".strip()
+
+    assert html == Markup(expected)
+
+
+def test_vue_like_syntax(catalog, folder):
+    (folder / "Test.jinja").write_text("""
+    {#def a, b, c, d #}
+    {{ a }} {{ b }} {{ c }} {{ d }}
+    """)
+    (folder / "Caller.jinja").write_text(
+        """<Test :a="2+2" b="2+2" :c="{'lorem': 'ipsum'}" :d="false" />"""
+    )
+    html = catalog.render("Caller")
+    print(html)
+    expected  = """4 2+2 {'lorem': 'ipsum'} False""".strip()
+    assert html == Markup(expected)
+
+
+def test_jinja_like_syntax(catalog, folder):
+    (folder / "Test.jinja").write_text("""
+    {#def a, b, c, d #}
+    {{ a }} {{ b }} {{ c }} {{ d }}
+    """)
+    (folder / "Caller.jinja").write_text(
+        """<Test a={{ 2+2 }} b="2+2" c={{ {'lorem': 'ipsum'} }} d={{ false }} />"""
+    )
+    html = catalog.render("Caller")
+    print(html)
+    expected  = """4 2+2 {'lorem': 'ipsum'} False""".strip()
+    assert html == Markup(expected)
+
+
+def test_mixed_syntax(catalog, folder):
+    (folder / "Test.jinja").write_text("""
+    {#def a, b, c, d #}
+    {{ a }} {{ b }} {{ c }} {{ d }}
+    """)
+    (folder / "Caller.jinja").write_text(
+        """<Test :a={{ 2+2 }} b="{{2+2}}" :c={{ {'lorem': 'ipsum'} }} :d={{ false }} />"""
+    )
+    html = catalog.render("Caller")
+    print(html)
+    expected  = """4 {{2+2}} {'lorem': 'ipsum'} False""".strip()
+    assert html == Markup(expected)
+
+
+@pytest.mark.parametrize("autoescape", [True, False])
+def test_slots(catalog, folder, autoescape):
+    catalog.jinja_env.autoescape = autoescape
+
+    (folder / "Component.jinja").write_text(
+        """
+<p>{{ content }}</p>
+<p>{{ content("first") }}</p>
+<p>{{ content("second") }}</p>
+<p>{{ content("antoher") }}</p>
+<p>{{ content() }}</p>
+""".strip()
+    )
+
+    (folder / "Messages.jinja").write_text(
+        """
+<Component>
+{% if _slot == "first" %}Hello World
+{%- elif _slot == "second" %}Lorem Ipsum
+{%- elif _slot == "meh" %}QWERTYUIOP
+{%- else %}Default{% endif %}
+</Component>
+""".strip()
+    )
+
+    html = catalog.render("Messages")
+    print(html)
+    expected = """
+<p>Default</p>
+<p>Hello World</p>
+<p>Lorem Ipsum</p>
+<p>Default</p>
+<p>Default</p>
+""".strip()
+    assert html == Markup(expected)