1 files changed, 156 insertions, 0 deletions
diff --git a/comm/.eslintrc.js b/comm/.eslintrc.js
new file mode 100644
index 0000000000..9d98f39b4a
--- /dev/null
+++ b/comm/.eslintrc.js
@@ -0,0 +1,156 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const path = require("path");
+
+const xpcshellTestConfig = require("eslint-plugin-mozilla/lib/configs/xpcshell-test.js");
+const browserTestConfig = require("eslint-plugin-mozilla/lib/configs/browser-test.js");
+const fs = require("fs");
+
+/**
+ * Some configurations have overrides, which can't be specified within overrides,
+ * so we need to remove them.
+ */
+function removeOverrides(config) {
+  config = { ...config };
+  delete config.overrides;
+  return config;
+}
+
+function readFile(path) {
+  return fs
+    .readFileSync(path, { encoding: "utf-8" })
+    .split("\n")
+    .filter(p => p && !p.startsWith("#"))
+    .map(p => p.replace(/^comm\//, ""));
+}
+
+const ignorePatterns = [
+  ...readFile(path.join(__dirname, "tools", "lint", "ThirdPartyPaths.txt")),
+  ...readFile(path.join(__dirname, "tools", "lint", "Generated.txt")),
+];
+
+const xpcshellTestPaths = [
+  "**/test*/unit*/",
+  "**/test*/xpcshell/",
+  "chat/**/test*/",
+];
+
+const browserTestPaths = [
+  "**/test*/**/browser/",
+  "mail/base/test/performance/",
+  "mail/base/test/webextensions/",
+  "mail/test/static/",
+];
+
+module.exports = {
+  parser: "@babel/eslint-parser",
+  parserOptions: {
+    sourceType: "script",
+    babelOptions: {
+      configFile: path.join(__dirname, "..", ".babel-eslint.rc.js"),
+    },
+  },
+  settings: {
+    "import/extensions": [".mjs"],
+    // To avoid bad interactions of the html plugin with the xml preprocessor in
+    // eslint-plugin-mozilla, we turn off processing of the html plugin for .xml
+    // files.
+    "html/xml-extensions": [".xhtml"],
+  },
+  // Ignore eslint configurations in parent directories.
+  root: true,
+
+  ignorePatterns,
+
+  // We would like the same base rules as provided by
+  // mozilla/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/recommended.js
+  extends: ["plugin:mozilla/recommended"],
+
+  // When adding items to this file please check for effects on sub-directories.
+  plugins: ["mozilla", "import"],
+
+  rules: {
+    complexity: ["error", 80],
+    "func-names": ["error", "never"],
+    "mozilla/prefer-boolean-length-check": "off",
+  },
+
+  overrides: [
+    {
+      files: [".eslintrc.js"],
+      env: {
+        node: true,
+        browser: false,
+      },
+    },
+    {
+      files: ["*.mjs"],
+      rules: {
+        "import/default": "error",
+        "import/export": "error",
+        "import/named": "error",
+        "import/namespace": "error",
+        "import/newline-after-import": "error",
+        "import/no-duplicates": "error",
+        "import/no-absolute-path": "error",
+        "import/no-named-default": "error",
+        "import/no-named-as-default": "error",
+        "import/no-named-as-default-member": "error",
+        "import/no-self-import": "error",
+        "import/no-unassigned-import": "error",
+        "import/no-unresolved": [
+          "error",
+          // Bug 1773473 - Ignore resolver URLs for chrome and resource as we
+          // do not yet have a resolver for them.
+          { ignore: ["chrome://", "resource://"] },
+        ],
+        "import/no-useless-path-segments": "error",
+      },
+    },
+    {
+      files: ["mail/components/storybook/**"],
+      rules: {
+        "import/no-unresolved": "off",
+      },
+    },
+    {
+      ...removeOverrides(xpcshellTestConfig),
+      files: xpcshellTestPaths.map(path => `${path}**`),
+      rules: {
+        ...xpcshellTestConfig.rules,
+        "func-names": "off",
+      },
+    },
+    {
+      // If it is a test head file, we turn off global unused variable checks, as it
+      // would require searching the other test files to know if they are used or not.
+      // This would be expensive and slow, and it isn't worth it for head files.
+      // We could get developers to declare as exported, but that doesn't seem worth it.
+      files: [
+        ...browserTestPaths.map(path => `${path}head*.js`),
+        ...xpcshellTestPaths.map(path => `${path}head*.js`),
+      ],
+      rules: {
+        "no-unused-vars": [
+          "error",
+          {
+            args: "none",
+            vars: "local",
+          },
+        ],
+      },
+    },
+    {
+      ...browserTestConfig,
+      files: browserTestPaths.map(path => `${path}**`),
+      rules: {
+        ...browserTestConfig.rules,
+        "func-names": "off",
+      },
+    },
+  ],
+};