.c8rc

@@ -0,0 +1,13 @@
+{
+    "include": [
+        "bin/**/*.js",
+        "conf/**/*.js",
+        "lib/**/*.js"
+    ],
+    "reporter": [
+        "lcov",
+        "text-summary",
+        "cobertura"
+    ],
+    "sourceMap": true
+}

.eslintignore

@@ -1,11 +1,14 @@
 /build/**
 /coverage/**
-/docs/**
+/docs/*
+!/docs/*.js
+!/docs/tools/
 /jsdoc/**
 /templates/**
 /tests/bench/**
 /tests/fixtures/**
 /tests/performance/**
 /tmp/**
+/tools/internal-rules/node_modules/**
 test.js
 !.eslintrc.js

.eslintrc.js

@@ -1,30 +1,200 @@
+/*
+ * IMPORTANT!
+ *
+ * Any changes made to this file must also be made to eslint.config.js.
+ *
+ * Internally, ESLint is using the eslint.config.js file to lint itself.
+ * This file is needed too, because:
+ *
+ * 1. ESLint VS Code extension expects eslintrc config files to be
+ *    present to work correctly.
+ *
+ * Once we no longer need to support both eslintrc and flat config, we will
+ * remove this file.
+ */
+
+
 "use strict";
 
 const path = require("path");
-const rulesDirPlugin = require("eslint-plugin-rulesdir");
 
-rulesDirPlugin.RULES_DIR = path.join(__dirname, "tools/internal-rules");
+const INTERNAL_FILES = {
+    CLI_ENGINE_PATTERN: "lib/cli-engine/**/*",
+    LINTER_PATTERN: "lib/linter/**/*",
+    RULE_TESTER_PATTERN: "lib/rule-tester/**/*",
+    RULES_PATTERN: "lib/rules/**/*",
+    SOURCE_CODE_PATTERN: "lib/source-code/**/*"
+};
+
+/**
+ * Resolve an absolute path or glob pattern.
+ * @param {string} pathOrPattern the path or glob pattern.
+ * @returns {string} The resolved path or glob pattern.
+ */
+function resolveAbsolutePath(pathOrPattern) {
+    return path.resolve(__dirname, pathOrPattern);
+}
+
+/**
+ * Create an array of `no-restricted-require` entries for ESLint's core files.
+ * @param {string} [pattern] The glob pattern to create the entries for.
+ * @returns {Object[]} The array of `no-restricted-require` entries.
+ */
+function createInternalFilesPatterns(pattern = null) {
+    return Object.values(INTERNAL_FILES)
+        .filter(p => p !== pattern)
+        .map(p => ({
+            name: [
+
+                // Disallow all children modules.
+                resolveAbsolutePath(p),
+
+                // Allow the main `index.js` module.
+                `!${resolveAbsolutePath(p.replace(/\*\*\/\*$/u, "index.js"))}`
+            ]
+        }));
+}
 
 module.exports = {
     root: true,
     plugins: [
         "eslint-plugin",
-        "node",
-        "rulesdir"
+        "internal-rules"
     ],
     extends: [
-        "./packages/eslint-config-eslint/default.yml",
-        "plugin:node/recommended",
-        "plugin:eslint-plugin/recommended"
+        "eslint/eslintrc"
     ],
+    parserOptions: {
+        ecmaVersion: 2021
+    },
     rules: {
-        "eslint-plugin/consistent-output": "error",
-        "eslint-plugin/no-deprecated-context-methods": "error",
-        "eslint-plugin/prefer-output-null": "error",
-        "eslint-plugin/prefer-placeholders": "error",
-        "eslint-plugin/report-message-format": ["error", "[^a-z].*\\.$"],
-        "eslint-plugin/test-case-property-ordering": "error",
-        "eslint-plugin/test-case-shorthand-strings": "error",
-        "rulesdir/multiline-comment-style": "error"
-    }
+        "internal-rules/multiline-comment-style": "error"
+    },
+    overrides: [
+        {
+            files: ["tools/*.js", "docs/tools/*.js"],
+            rules: {
+                "no-console": "off",
+                "n/no-process-exit": "off"
+            }
+        },
+        {
+            files: ["lib/rules/*", "tools/internal-rules/*"],
+            excludedFiles: ["index.js"],
+            extends: [
+                "plugin:eslint-plugin/rules-recommended"
+            ],
+            rules: {
+                "eslint-plugin/prefer-placeholders": "error",
+                "eslint-plugin/prefer-replace-text": "error",
+                "eslint-plugin/report-message-format": ["error", "[^a-z].*\\.$"],
+                "eslint-plugin/require-meta-docs-description": ["error", { pattern: "^(Enforce|Require|Disallow) .+[^. ]$" }],
+                "internal-rules/no-invalid-meta": "error"
+            }
+        },
+        {
+            files: ["lib/rules/*"],
+            excludedFiles: ["index.js"],
+            rules: {
+                "eslint-plugin/require-meta-docs-url": ["error", { pattern: "https://eslint.org/docs/latest/rules/{{name}}" }]
+            }
+        },
+        {
+            files: ["tests/lib/rules/*", "tests/tools/internal-rules/*"],
+            extends: [
+                "plugin:eslint-plugin/tests-recommended"
+            ],
+            rules: {
+                "eslint-plugin/test-case-property-ordering": "error",
+                "eslint-plugin/test-case-shorthand-strings": "error"
+            }
+        },
+        {
+            files: ["tests/**/*"],
+            env: { mocha: true },
+            rules: {
+                "no-restricted-syntax": ["error", {
+                    selector: "CallExpression[callee.object.name='assert'][callee.property.name='doesNotThrow']",
+                    message: "`assert.doesNotThrow()` should be replaced with a comment next to the code."
+                }]
+            }
+        },
+
+        // Restrict relative path imports
+        {
+            files: ["lib/*"],
+            excludedFiles: ["lib/unsupported-api.js"],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns()
+                ]]
+            }
+        },
+        {
+            files: [INTERNAL_FILES.CLI_ENGINE_PATTERN],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(INTERNAL_FILES.CLI_ENGINE_PATTERN)
+                ]]
+            }
+        },
+        {
+            files: [INTERNAL_FILES.LINTER_PATTERN],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(INTERNAL_FILES.LINTER_PATTERN),
+                    "fs",
+                    resolveAbsolutePath("lib/cli-engine/index.js"),
+                    resolveAbsolutePath("lib/rule-tester/index.js")
+                ]]
+            }
+        },
+        {
+            files: [INTERNAL_FILES.RULES_PATTERN],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(INTERNAL_FILES.RULES_PATTERN),
+                    "fs",
+                    resolveAbsolutePath("lib/cli-engine/index.js"),
+                    resolveAbsolutePath("lib/linter/index.js"),
+                    resolveAbsolutePath("lib/rule-tester/index.js"),
+                    resolveAbsolutePath("lib/source-code/index.js")
+                ]]
+            }
+        },
+        {
+            files: ["lib/shared/**/*"],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(),
+                    resolveAbsolutePath("lib/cli-engine/index.js"),
+                    resolveAbsolutePath("lib/linter/index.js"),
+                    resolveAbsolutePath("lib/rule-tester/index.js"),
+                    resolveAbsolutePath("lib/source-code/index.js")
+                ]]
+            }
+        },
+        {
+            files: [INTERNAL_FILES.SOURCE_CODE_PATTERN],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(INTERNAL_FILES.SOURCE_CODE_PATTERN),
+                    "fs",
+                    resolveAbsolutePath("lib/cli-engine/index.js"),
+                    resolveAbsolutePath("lib/linter/index.js"),
+                    resolveAbsolutePath("lib/rule-tester/index.js"),
+                    resolveAbsolutePath("lib/rules/index.js")
+                ]]
+            }
+        },
+        {
+            files: [INTERNAL_FILES.RULE_TESTER_PATTERN],
+            rules: {
+                "n/no-restricted-require": ["error", [
+                    ...createInternalFilesPatterns(INTERNAL_FILES.RULE_TESTER_PATTERN),
+                    resolveAbsolutePath("lib/cli-engine/index.js")
+                ]]
+            }
+        }
+    ]
 };

.gitattributes

@@ -1,4 +1,8 @@
 # Convert text file line endings to lf
 * text=auto
 
-*.js    text eol=lf
+*.js text eol=lf
+
+# The test fixtures are text files.
+/tests/fixtures/**/* text eol=lf
+/tests/fixtures/ignored-paths/crlf/.eslintignore text eol=crlf

.github/CODEOWNERS

@@ -0,0 +1,2 @@
+/docs/ @eslint/website-team @eslint/eslint-team
+* @eslint/eslint-team