feat: skip processing code blocks on specific languages like `styleli…

…nt-prettier` (#415)

.eslintignore

@@ -1 +1,2 @@
 !.eslintrc.js
+test/fixtures

.github/workflows/ci.yml

@@ -15,10 +15,10 @@ jobs:
         node-version: [12, 14, 16]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
 

eslint-plugin-prettier.js

@@ -179,22 +179,53 @@ module.exports = {
             // * Prettier supports parsing the file type
             // * There is an ESLint processor that extracts JavaScript snippets
             //   from the file type.
-            const parserBlocklist = [null, 'markdown', 'html'];
-
-            let inferParserToBabel =
-              parserBlocklist.indexOf(inferredParser) !== -1;
-
-            if (
-              // it could be processed by `@graphql-eslint/eslint-plugin` or `eslint-plugin-graphql`
-              inferredParser === 'graphql' &&
-              // for `eslint-plugin-graphql`, see https://github.com/apollographql/eslint-plugin-graphql/blob/master/src/index.js#L416
-              source.startsWith('ESLintPluginGraphQLFile`')
-            ) {
-              inferParserToBabel = true;
-            }
+            if (filepath === onDiskFilepath) {
+              // The following list means the plugin process source into js content
+              // but with same filename, so we need to change the parser to `babel`
+              // by default.
+              // Related ESLint plugins are:
+              // 1. `eslint-plugin-graphql` (replacement: `@graphql-eslint/eslint-plugin`)
+              // 2. `eslint-plugin-markdown@1` (replacement: `eslint-plugin-markdown@2+`)
+              // 3. `eslint-plugin-html`
+              const parserBlocklist = [null, 'markdown', 'html'];
+
+              let inferParserToBabel =
+                parserBlocklist.indexOf(inferredParser) !== -1;
+
+              if (
+                // it could be processed by `@graphql-eslint/eslint-plugin` or `eslint-plugin-graphql`
+                inferredParser === 'graphql' &&
+                // for `eslint-plugin-graphql`, see https://github.com/apollographql/eslint-plugin-graphql/blob/master/src/index.js#L416
+                source.startsWith('ESLintPluginGraphQLFile`')
+              ) {
+                inferParserToBabel = true;
+              }
 
-            if (filepath === onDiskFilepath && inferParserToBabel) {
-              initialOptions.parser = 'babel';
+              if (inferParserToBabel) {
+                initialOptions.parser = 'babel';
+              }
+            } else {
+              // Similar to https://github.com/prettier/stylelint-prettier/pull/22
+              // In all of the following cases ESLint extracts a part of a file to
+              // be formatted and there exists a prettier parser for the whole file.
+              // If you're interested in prettier you'll want a fully formatted file so
+              // you're about to run prettier over the whole file anyway.
+              // Therefore running prettier over just the style section is wasteful, so
+              // skip it.
+              const parserBlocklist = [
+                'babel',
+                'babylon',
+                'flow',
+                'typescript',
+                'vue',
+                'markdown',
+                'html',
+                'mdx',
+                'angular',
+              ];
+              if (parserBlocklist.indexOf(inferredParser) !== -1) {
+                return;
+              }
             }
 
             const prettierOptions = Object.assign(

package.json

@@ -35,26 +35,33 @@
     "prettier": ">=2.0.0"
   },
   "devDependencies": {
-    "@graphql-eslint/eslint-plugin": "^2.3.0",
+    "@graphql-eslint/eslint-plugin": "^2.5.0",
     "@not-an-aardvark/node-release-script": "^0.1.0",
-    "eslint": "^8.1.0",
+    "@typescript-eslint/parser": "^5.29.0",
+    "eslint": "^8.18.0",
     "eslint-config-not-an-aardvark": "^2.1.0",
-    "eslint-config-prettier": "^8.3.0",
-    "eslint-plugin-eslint-plugin": "^4.0.2",
+    "eslint-config-prettier": "^8.5.0",
+    "eslint-mdx": "^1.17.0",
+    "eslint-plugin-eslint-plugin": "^4.3.0",
+    "eslint-plugin-mdx": "^1.17.0",
     "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "link:.",
     "eslint-plugin-self": "^1.2.1",
-    "graphql": "^15.7.1",
-    "mocha": "^6.2.3",
-    "prettier": "^2.4.1",
-    "vue-eslint-parser": "^8.0.0"
+    "graphql": "^16.5.0",
+    "mocha": "^9.2.2",
+    "prettier": "^2.7.1",
+    "vue-eslint-parser": "^8.3.0"
   },
   "peerDependenciesMeta": {
     "eslint-config-prettier": {
       "optional": true
     }
   },
+  "resolutions": {
+    "@babel/traverse": "^7.18.5"
+  },
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=12.0.0"
   },
   "license": "MIT"
 }

test/fixtures/mdx.mdx

@@ -0,0 +1,7 @@
+import { Fragment } from 'react'
+
+<div>Hello World!</div>
+
+```ts
+export declare const x = 1
+```

test/invalid/mdx.txt

@@ -0,0 +1,20 @@
+CODE:
+import React from 'react'
+
+<div>Hello World</div>
+
+OUTPUT:
+import React from 'react';
+
+<div>Hello World</div>
+
+OPTIONS:
+[]
+
+ERRORS:
+[
+  {
+    message: 'Insert `;`',
+    line: 1, column: 26, endLine: 1, endColumn: 26,
+  },
+]

test/prettier.js

@@ -18,12 +18,38 @@ const path = require('path');
 const eslintPluginPrettier = require('..');
 
 const rule = eslintPluginPrettier.rules.prettier;
-const RuleTester = require('eslint').RuleTester;
+
+const assert = require('assert');
+const { ESLint, RuleTester } = require('eslint');
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
+const eslint = new ESLint({
+  baseConfig: {
+    parserOptions: {
+      ecmaVersion: 2021,
+      ecmaFeatures: {
+        jsx: true,
+      },
+      sourceType: 'module',
+    },
+    extends: 'plugin:prettier/recommended',
+    overrides: [
+      {
+        files: '*.mdx',
+        extends: 'plugin:mdx/recommended',
+        settings: {
+          'mdx/code-block': true,
+        },
+      },
+    ],
+  },
+  useEslintrc: false,
+  ignore: false,
+});
+
 const ruleTester = new RuleTester();
 
 ruleTester.run('prettier', rule, {
@@ -154,6 +180,69 @@ eslintPluginGraphqlRuleTester.run('eslint-plugin-graphql', rule, {
   invalid: [],
 });
 
+const mdxRuleTester = new RuleTester({
+  parser: require.resolve('eslint-mdx'),
+  parserOptions: {
+    ...require('eslint-mdx').DEFAULT_PARSER_OPTIONS,
+    // mdx-js/eslint-mdx#366
+    ecmaVersion: 2021,
+  },
+});
+
+mdxRuleTester.run('eslint-plugin-mdx', rule, {
+  valid: [
+    {
+      code: [
+        "import React from 'react';",
+        '',
+        '<div>Hello World</div>',
+        '',
+      ].join('\n'),
+      filename: 'valid.mdx',
+    },
+  ],
+  invalid: [
+    Object.assign(loadInvalidFixture('mdx'), {
+      filename: 'invalid.mdx',
+    }),
+  ],
+});
+
+runFixture('mdx', [
+  [
+    {
+      column: 33,
+      endColumn: 33,
+      endLine: 1,
+      fix: {
+        range: [32, 32],
+        text: ';',
+      },
+      line: 1,
+      message: 'Insert `;`',
+      messageId: 'insert',
+      nodeType: null,
+      ruleId: 'prettier/prettier',
+      severity: 2,
+    },
+    {
+      column: 27,
+      endColumn: 27,
+      endLine: 6,
+      fix: {
+        range: [91, 91],
+        text: ';',
+      },
+      line: 6,
+      message: 'Insert `;`',
+      messageId: 'insert',
+      nodeType: null,
+      ruleId: 'prettier/prettier',
+      severity: 2,
+    },
+  ],
+]);
+
 // ------------------------------------------------------------------------------
 //  Helpers
 // ------------------------------------------------------------------------------
@@ -193,3 +282,20 @@ function loadInvalidFixture(name) {
 function getPrettierRcJsFilename(dir, file = 'dummy.js') {
   return path.resolve(__dirname, `./prettierrc/${dir}/${file}`);
 }
+
+function runFixture(name, asserts) {
+  return eslint
+    .lintFiles(`test/fixtures/${name}.*`)
+    .then((results) =>
+      assert.deepStrictEqual(
+        asserts,
+        results.map(({ messages }) => messages)
+      )
+    )
+    .catch((err) => {
+      // eslint-disable-next-line no-console
+      console.error(err);
+      // eslint-disable-next-line no-process-exit
+      process.exit(1);
+    });
+}