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+# Building
+
+Building the project is not usually needed for local development.
+However, for exports to WPT, or deployment (https://gpuweb.github.io/cts/),
+files can be pre-generated.
+
+The project builds into two directories:
+
+- `out/`: Built framework and test files, needed to run standalone or command line.
+- `out-wpt/`: Build directory for export into WPT. Contains:
+    - An adapter for running WebGPU CTS tests under WPT
+    - A copy of the needed files from `out/`
+    - A copy of any `.html` test cases from `src/`
+
+To build and run all pre-submit checks (including type and lint checks and
+unittests), use:
+
+```sh
+npm test
+```
+
+For checks only:
+
+```sh
+npm run check
+```
+
+For a quicker iterative build:
+
+```sh
+npm run standalone
+```
+
+## Run
+
+To serve the built files (rather than using the dev server), run `npx grunt serve`.
+
+## Export to WPT
+
+Run `npm run wpt`.
+
+Copy (or symlink) the `out-wpt/` directory as the `webgpu/` directory in your
+WPT checkout or your browser's "internal" WPT test directory.