Migrate internal ESLint rules to ESM (#17123)

eslint.config.js

@@ -20,7 +20,7 @@ const ignores = `
 test*.*
 # Ignore directories and files in 'tests/format'
 tests/format/**/*
-# Unignore directories and 'jsfmt.spec.js', 'format.test.js' file
+# Unignore directories and 'format.test.js' file
 !tests/format/**/
 !tests/format/**/format.test.js
 tests/integration/cli/
@@ -289,11 +289,7 @@ export default [
   },
   // CommonJS modules
   {
-    files: [
-      "**/*.cjs",
-      "scripts/tools/eslint-plugin-prettier-internal-rules/**/*.js",
-      "website/**/*.js",
-    ],
+    files: ["**/*.cjs", "website/**/*.js"],
     languageOptions: {
       sourceType: "script",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/await-cli-tests.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "CallExpression",
   '[callee.type="Identifier"]',
@@ -9,12 +7,9 @@ const selector = [
 const MESSAGE_ID_CALL = "await-cli-tests/call";
 const MESSAGE_ID_GETTER = "await-cli-tests/getter";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/await-cli-tests.js",
-    },
     messages: {
       [MESSAGE_ID_CALL]: "'runCli()' should be awaited or calling `.test()`.",
       [MESSAGE_ID_GETTER]: "'runCli().{{property}}' should be awaited.",

scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js

@@ -1,6 +1,4 @@
-"use strict";
-
-const path = require("path");
+import path from "node:path";
 
 const parentPropertyCheckSelector = [
   "FunctionDeclaration",
@@ -44,12 +42,9 @@ const keyCheckSelector = [
 const MESSAGE_ID_PREFER_KEY_CHECK = "prefer-key-check";
 const MESSAGE_ID_KEY_CHECK_FIRST = "key-check-on-left";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/better-parent-property-check-in-needs-parens.js",
-    },
     messages: {
       [MESSAGE_ID_PREFER_KEY_CHECK]:
         "Prefer `key {{operator}} {{propertyText}}` over `parent.{{property}} {{operator}} node`.",

scripts/tools/eslint-plugin-prettier-internal-rules/directly-loc-start-end.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "MemberExpression",
   "[computed=false]",
@@ -9,12 +7,9 @@ const selector = [
 
 const MESSAGE_ID = "directly-loc-start-end";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/directly-loc-start-end.js",
-    },
     messages: {
       [MESSAGE_ID]:
         "Please import `{{function}}` function and use it directly.",

scripts/tools/eslint-plugin-prettier-internal-rules/flat-ast-path-call.js

@@ -1,5 +1,3 @@
-"use strict";
-
 // This rule only work for nested `AstPath#call()` for now
 
 function astPathCallSelector(path) {
@@ -29,12 +27,9 @@ const selector = [
 
 const MESSAGE_ID = "flat-ast-path-call";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/flat-ast-path-call.js",
-    },
     messages: {
       [MESSAGE_ID]: "Do not use nested `AstPath#{{method}}(…)`.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/index.js

@@ -1,25 +1,40 @@
-"use strict";
+import fs from "node:fs/promises";
+import path from "node:path";
+import packageJson from "./package.json" with { type: "json" };
 
-module.exports = {
-  rules: {
-    "await-cli-tests": require("./await-cli-tests.js"),
-    "better-parent-property-check-in-needs-parens": require("./better-parent-property-check-in-needs-parens.js"),
-    "directly-loc-start-end": require("./directly-loc-start-end.js"),
-    "flat-ast-path-call": require("./flat-ast-path-call.js"),
-    "jsx-identifier-case": require("./jsx-identifier-case.js"),
-    "massage-ast-parameter-names": require("./massage-ast-parameter-names.js"),
-    "no-conflicting-comment-check-flags": require("./no-conflicting-comment-check-flags.js"),
-    "no-doc-public-import": require("./no-doc-public-import.js"),
-    "no-empty-flat-contents-for-if-break": require("./no-empty-flat-contents-for-if-break.js"),
-    "no-identifier-n": require("./no-identifier-n.js"),
-    "no-legacy-format-test": require("./no-legacy-format-test.js"),
-    "no-node-comments": require("./no-node-comments.js"),
-    "no-unnecessary-ast-path-call": require("./no-unnecessary-ast-path-call.js"),
-    "prefer-ast-path-each": require("./prefer-ast-path-each.js"),
-    "prefer-create-type-check-function": require("./prefer-create-type-check-function.js"),
-    "prefer-indent-if-break": require("./prefer-indent-if-break.js"),
-    "prefer-is-non-empty-array": require("./prefer-is-non-empty-array.js"),
-    "prefer-fs-promises-submodule": require("./prefer-fs-promises-submodule.js"),
-    "prefer-ast-path-getters": require("./prefer-ast-path-getters.js"),
-  },
+const rules = {};
+
+for (const dirent of await fs.readdir(import.meta.dirname, {
+  withFileTypes: true,
+})) {
+  const fileName = dirent.name;
+
+  if (
+    dirent.isDirectory() ||
+    !fileName.endsWith(".js") ||
+    fileName === "index.js" ||
+    fileName === "test.js"
+  ) {
+    continue;
+  }
+
+  const name = path.basename(fileName, ".js");
+  const { default: rule } = await import(
+    new URL(fileName, import.meta.url).href
+  );
+
+  if (rule.meta?.docs?.url) {
+    throw new Error(`Please remove 'meta.docs.url' from '${fileName}'.`);
+  }
+
+  rule.meta ??= {};
+  rule.meta.docs ??= {};
+  rule.meta.docs.url = `https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/${fileName}`;
+
+  rules[name] = rule;
+}
+
+export default {
+  meta: { name: packageJson.name, version: packageJson.version },
+  rules,
 };

scripts/tools/eslint-plugin-prettier-internal-rules/jsx-identifier-case.js

@@ -1,16 +1,11 @@
-"use strict";
-
 const MESSAGE_ID = "jsx-identifier-case";
 
 // To ignore variables, config eslint like this
 // {'prettier-internal-rules/jsx-identifier-case': ['error', 'name1', ... 'nameN']}
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/jsx-identifier-case.js",
-    },
     messages: {
       [MESSAGE_ID]: "Please rename '{{name}}' to '{{fixed}}'.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/massage-ast-parameter-names.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const MESSAGE_ID = "massage-ast-parameter-names";
 
 const massageAstFunctionSelector = [
@@ -17,12 +15,9 @@ const getVariableIdentifiers = ({ identifiers, references }) => [
   ]),
 ];
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/massage-ast-parameter-names.js",
-    },
     messages: {
       [MESSAGE_ID]:
         "The {{name}} node parameter '{{original}}' should be named '{{name}}'.",

scripts/tools/eslint-plugin-prettier-internal-rules/no-conflicting-comment-check-flags.js

@@ -1,4 +1,3 @@
-"use strict";
 const MESSAGE_ID_UNIQUE = "unique";
 const MESSAGE_ID_CONFLICTING = "conflicting";
 
@@ -37,12 +36,9 @@ const flatFlags = (node) => {
   return flags.map((node) => node.property.name);
 };
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-conflicting-comment-check-flags.js",
-    },
     messages: {
       [MESSAGE_ID_UNIQUE]: "Do not use same flag multiple times.",
       [MESSAGE_ID_CONFLICTING]: "Do not use {{flags}} together.",

scripts/tools/eslint-plugin-prettier-internal-rules/no-doc-public-import.js

@@ -1,5 +1,4 @@
-"use strict";
-const path = require("path");
+import path from "node:path";
 
 const selector = [
   ":matches(ImportDeclaration, ExportNamedDeclaration, ImportExpression)",
@@ -8,10 +7,13 @@ const selector = [
 ].join("");
 
 const messageId = "no-doc-public-import";
-const docIndexFile = path.join(__dirname, "../../../src/document/public.js");
+const docIndexFile = path.join(
+  import.meta.dirname,
+  "../../../src/document/public.js",
+);
 const ignored = new Set([
-  path.join(__dirname, "../../../src/index.js"),
-  path.join(__dirname, "../../../src/standalone.js"),
+  path.join(import.meta.dirname, "../../../src/index.js"),
+  path.join(import.meta.dirname, "../../../src/standalone.js"),
 ]);
 
 const docProperties = new Set(["builders", "debug", "printer", "utils"]);
@@ -84,12 +86,9 @@ function fix(source, context) {
   };
 }
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-doc-public-import.js",
-    },
     messages: {
       [messageId]: "Do not {{type}} document/public.js file",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/no-empty-flat-contents-for-if-break.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "CallExpression",
   "[optional=false]",
@@ -13,12 +11,9 @@ const selector = [
 
 const messageId = "no-empty-flat-contents-for-if-break";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-empty-flat-contents-for-if-break.js",
-    },
     messages: {
       [messageId]:
         "Please don't pass an empty string to second parameter of ifBreak.",

scripts/tools/eslint-plugin-prettier-internal-rules/no-identifier-n.js

@@ -1,6 +1,5 @@
-"use strict";
+import { findVariable } from "@eslint-community/eslint-utils";
 
-const { findVariable } = require("@eslint-community/eslint-utils");
 const ERROR = "error";
 const SUGGESTION = "suggestion";
 const selector = [
@@ -12,12 +11,9 @@ const selector = [
   ].join(", ")})`,
 ].join("");
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-identifier-n.js",
-    },
     messages: {
       [ERROR]: "Please rename variable 'n'.",
       [SUGGESTION]: "Rename to `node`.",

scripts/tools/eslint-plugin-prettier-internal-rules/no-legacy-format-test.js

@@ -1,6 +1,4 @@
-"use strict";
-
-const path = require("path");
+import path from "node:path";
 
 const legacyRunFormatTestCall = [
   "CallExpression",
@@ -38,12 +36,9 @@ const MESSAGE_ID_ARGUMENT = "dirname-argument";
 const MESSAGE_ID_PROPERTY = "dirname-property";
 const MESSAGE_ID_LEGACY_FILENAME = "legacy-filename";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-legacy-format-test.js",
-    },
     messages: {
       [MESSAGE_ID_LEGACY_FUNCTION_NAME]:
         "Use `runFormatTest(…)` instead of `run_spec(…)`.",

scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js

@@ -1,5 +1,4 @@
-"use strict";
-const path = require("path");
+import path from "node:path";
 
 // `node.comments`
 const memberExpressionSelector = [
@@ -25,12 +24,9 @@ const selector = `:matches(${memberExpressionSelector}, ${objectPatternSelector}
 
 const messageId = "no-node-comments";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-node-comments.js",
-    },
     messages: {
       [messageId]: "Do not access node.comments.",
     },
@@ -62,7 +58,7 @@ module.exports = {
         }
         const { file, functions } = option;
         return [
-          path.join(__dirname, "../../..", file),
+          path.join(import.meta.dirname, "../../..", file),
           functions ? new Set(functions) : true,
         ];
       }),

scripts/tools/eslint-plugin-prettier-internal-rules/no-unnecessary-ast-path-call.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "CallExpression",
   "[optional=false]",
@@ -14,12 +12,9 @@ const selector = [
 
 const messageId = "no-unnecessary-ast-path-call";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/no-unnecessary-ast-path-call.js",
-    },
     messages: {
       [messageId]: "Do not use `AstPath.call()` with one argument.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/package.json

@@ -3,9 +3,9 @@
   "version": "1.0.3",
   "description": "Prettier internal eslint rules",
   "private": true,
-  "type": "commonjs",
+  "type": "module",
   "author": "fisker",
-  "main": "./index.js",
+  "exports": "./index.js",
   "license": "MIT",
   "scripts": {
     "test": "node test.js",

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-ast-path-each.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "ExpressionStatement",
   ">",
@@ -16,12 +14,9 @@ const selector = [
 
 const messageId = "prefer-ast-path-each";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/require-json-extensions.js",
-    },
     messages: {
       [messageId]: "Prefer `AstPath#each()` over `AstPath#map()`.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-ast-path-getters.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "CallExpression",
   "[optional=false]",
@@ -53,12 +51,9 @@ function getReplacement(callExpression) {
   }
 }
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/prefer-ast-path-getters.js",
-    },
     fixable: "code",
     hasSuggestions: true,
     messages: {

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-create-type-check-function.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const MESSAGE_ID = "prefer-create-type-check-function";
 
 const isTypeAccess = (node, parameterName) => {
@@ -135,12 +133,9 @@ const selector = [
   "[generator!=true]",
 ].join("");
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/prefer-create-type-check-function.js",
-    },
     messages: {
       [MESSAGE_ID]:
         "Prefer use `createTypeCheckFunction` to create this function",

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-fs-promises-submodule.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "ImportDeclaration",
   "[specifiers.length=1]",
@@ -11,12 +9,9 @@ const selector = [
 
 const messageId = "prefer-fs-promises-submodule";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/prefer-fs-promises-submodule.js",
-    },
     messages: {
       [messageId]:
         'Prefer `import fs from "node:fs/promises"` instead of `import { promises as fs } from "fs";`',

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-indent-if-break.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const selector = [
   "CallExpression",
   "[optional=false]",
@@ -18,12 +16,9 @@ const selector = [
 
 const messageId = "prefer-indent-if-break";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/prefer-indent-if-break.js",
-    },
     messages: {
       [messageId]: "Prefer `indentIfBreak(…)` over `ifBreak(indent(…), …)`.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/prefer-is-non-empty-array.js

@@ -1,5 +1,3 @@
-"use strict";
-
 const getLengthSelector = (path) =>
   `[${path}.type="MemberExpression"][${path}.property.type="Identifier"][${path}.property.name="length"]`;
 const selector = [
@@ -52,12 +50,9 @@ const isArrayIsArrayCall = (node) =>
 
 const MESSAGE_ID = "prefer-is-non-empty-array";
 
-module.exports = {
+export default {
   meta: {
     type: "suggestion",
-    docs: {
-      url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/prefer-is-non-empty-array.js",
-    },
     messages: {
       [MESSAGE_ID]: "Please use `isNonEmptyArray()`.",
     },

scripts/tools/eslint-plugin-prettier-internal-rules/test.js

@@ -1,12 +1,10 @@
-"use strict";
-
-const path = require("path");
-const { outdent } = require("outdent");
-const { RuleTester } = require("eslint");
-const { rules } = require("./index.js");
+import path from "node:path";
+import { RuleTester } from "eslint";
+import { outdent } from "outdent";
+import plugin from "./index.js";
 
 const test = (ruleId, tests) => {
-  new RuleTester().run(ruleId, rules[ruleId], tests);
+  new RuleTester().run(ruleId, plugin.rules[ruleId], tests);
 };
 
 test("await-cli-tests", {
@@ -254,7 +252,7 @@ test("no-identifier-n", {
         },
       ],
     },
-    // ESLint 8 doesn't allow suggest invalid code
+    // ESLint>=8 doesn't allow suggest invalid code
     // {
     //   code: "const n = 1;const node = 2;",
     //   output: null,
@@ -308,12 +306,12 @@ test("no-node-comments", {
     "const comments = node.notComments",
     {
       code: "function functionName() {return node.comments;}",
-      filename: path.join(__dirname, "../../..", "a.js"),
+      filename: path.join(import.meta.dirname, "../../..", "a.js"),
       options: ["a.js"],
     },
     {
       code: "function functionName() {return node.comments;}",
-      filename: path.join(__dirname, "../../..", "a.js"),
+      filename: path.join(import.meta.dirname, "../../..", "a.js"),
       options: [{ file: "a.js", functions: ["functionName"] }],
     },
   ],
@@ -330,7 +328,7 @@ test("no-node-comments", {
     {
       code: "function notFunctionName() {return node.comments;}",
       output: null,
-      filename: path.join(__dirname, "../../..", "a.js"),
+      filename: path.join(import.meta.dirname, "../../..", "a.js"),
       options: [{ file: "a.js", functions: ["functionName"] }],
       errors: [{ message: "Do not access node.comments." }],
     },