refactor(stylelint-copyright): migrate to TS

packages/stylelint-copyright/package.json

@@ -2,14 +2,19 @@
   "name": "stylelint-copyright",
   "version": "2.0.0-beta.20",
   "description": "Stylelint plugin to check CSS files for a copyright header.",
-  "main": "index.js",
+  "main": "lib/index.js",
   "license": "MIT",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/facebook/docusaurus.git",
     "directory": "packages/stylelint-copyright"
   },
   "dependencies": {
-    "stylelint": "^14.8.2"
+    "stylelint": "^14.8.2",
+    "tslib": "^2.4.0"
   }
 }

packages/stylelint-copyright/__tests__/index.test.js → packages/stylelint-copyright/src/__tests__/index.test.ts

@@ -6,13 +6,21 @@
  */
 /* eslint-disable jest/no-conditional-expect */
 
-const path = require('path');
-const stylelint = require('stylelint');
-const rule = require('..');
+import path from 'path';
+import stylelint, {type LinterResult} from 'stylelint';
+import rule from '../index';
 
-const {ruleName, messages} = rule;
+const {ruleName} = rule;
 
-function getOutputCss(output) {
+declare global {
+  namespace jest {
+    interface Matchers<R> {
+      toHaveMessage: () => R;
+    }
+  }
+}
+
+function getOutputCss(output: LinterResult) {
   // eslint-disable-next-line no-underscore-dangle
   const result = output.results[0]._postcssResult;
   return result.root.toString(result.opts.syntax);
@@ -97,6 +105,8 @@ function testStylelintRule(config, tests) {
         }
 
         return {
+          message: () =>
+            'Expected "reject" test case to not have a "message" property',
           pass: true,
         };
       },
@@ -106,7 +116,7 @@ function testStylelintRule(config, tests) {
 
 testStylelintRule(
   {
-    plugins: [path.join(__dirname, '..')],
+    plugins: [path.join(__dirname, '../../lib/index.js')],
     rules: {
       [ruleName]: [true, {header: '*\n * Copyright'}],
     },
@@ -143,7 +153,8 @@ testStylelintRule(
  * Copyright
  */
 .foo {}`,
-        message: messages.rejected,
+        message:
+          'Missing copyright in the header comment (docusaurus/copyright-header)',
         line: 1,
         column: 1,
       },
@@ -154,7 +165,8 @@ testStylelintRule(
  * Copyright
  */
 .foo {}`,
-        message: messages.rejected,
+        message:
+          'Missing copyright in the header comment (docusaurus/copyright-header)',
         line: 1,
         column: 1,
       },
@@ -173,7 +185,8 @@ testStylelintRule(
 */
 
 .foo {}`,
-        message: messages.rejected,
+        message:
+          'Missing copyright in the header comment (docusaurus/copyright-header)',
         line: 1,
         column: 1,
       },
@@ -192,7 +205,8 @@ testStylelintRule(
  */
 
 .foo {}`,
-        message: messages.rejected,
+        message:
+          'Missing copyright in the header comment (docusaurus/copyright-header)',
         line: 1,
         column: 1,
       },
@@ -217,7 +231,8 @@ testStylelintRule(
  * Copyright
  */
  .foo {}`,
-        message: messages.rejected,
+        message:
+          'Missing copyright in the header comment (docusaurus/copyright-header)',
         line: 1,
         column: 1,
       },

packages/stylelint-copyright/src/index.ts

@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import stylelint from 'stylelint';
+
+const ruleName = 'docusaurus/copyright-header';
+const messages = stylelint.utils.ruleMessages(ruleName, {
+  rejected: 'Missing copyright in the header comment',
+});
+
+type SecondaryOption = {header?: string};
+
+const plugin = stylelint.createPlugin(
+  ruleName,
+  (primaryOption: boolean, secondaryOption: SecondaryOption, context) =>
+    (root, result) => {
+      stylelint.utils.validateOptions(
+        result,
+        ruleName,
+        {
+          actual: primaryOption,
+          possible: [true, false],
+        },
+        {
+          actual: secondaryOption,
+          possible: (v) => typeof (v as SecondaryOption)?.header === 'string',
+        },
+      );
+
+      if (
+        root.first &&
+        root.first.type === 'comment' &&
+        root.first.source?.start?.column === 1
+      ) {
+        const {text} = root.first;
+        if (text === secondaryOption.header) {
+          return;
+        }
+      }
+      if (context.fix) {
+        root.first?.before(`/*${secondaryOption.header}\n */`);
+        return;
+      }
+
+      stylelint.utils.report({
+        message: messages.rejected,
+        node: root,
+        result,
+        ruleName,
+      });
+    },
+);
+
+export = plugin;

packages/stylelint-copyright/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo",
+    "rootDir": "src",
+    "outDir": "lib"
+  }
+}