feat: support @graphql-eslint/eslint-plugin out of box

.github/workflows/ci.yml

@@ -13,6 +13,7 @@ jobs:
       matrix:
         eslint-version: [7.x, 6.x, 5.x]
         node-version: [16.x, 14.x, 12.x, 10.x, 8.x, 6.x]
+        test-graphql: [true, false]
 
         exclude:
           # eslint 7 does not support node 6 or 8
@@ -26,6 +27,11 @@ jobs:
             node-version: 8.x
           - eslint-version: 6.x
             node-version: 6.x
+          # the version of graphql-config used in @graphql-eslint/eslint-plugin does not support node 8
+          - test-graphql: true
+            node-version: 8.x
+          - test-graphql: true
+            node-version: 6.x
 
     steps:
       - uses: actions/checkout@v2
@@ -41,5 +47,8 @@ jobs:
       - name: Install
         run: yarn install
 
+      - if: matrix.test-graphql == true
+        run: yarn add -D @graphql-eslint/eslint-plugin graphql
+
       - name: Test
         run: yarn run test

eslint-plugin-prettier.js

@@ -165,7 +165,7 @@ module.exports = {
                 })
               : null;
 
-            const prettierFileInfo = prettier.getFileInfo.sync(
+            const { ignored, inferredParser } = prettier.getFileInfo.sync(
               onDiskFilepath,
               Object.assign(
                 {},
@@ -175,7 +175,7 @@ module.exports = {
             );
 
             // Skip if file is ignored using a .prettierignore file
-            if (prettierFileInfo.ignored) {
+            if (ignored) {
               return;
             }
 
@@ -206,11 +206,21 @@ module.exports = {
             // * Prettier supports parsing the file type
             // * There is an ESLint processor that extracts JavaScript snippets
             //   from the file type.
-            const parserBlocklist = [null, 'graphql', 'markdown', 'html'];
+            const parserBlocklist = [null, 'markdown', 'html'];
+
+            let inferParserToBabel =
+              parserBlocklist.indexOf(inferredParser) !== -1;
+
             if (
-              filepath === onDiskFilepath &&
-              parserBlocklist.indexOf(prettierFileInfo.inferredParser) !== -1
+              // 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) {
               // Prettier v1.16.0 renamed the `babylon` parser to `babel`
               // Use the modern name if available
               const supportBabelParser = prettier

test/prettier.js

@@ -26,6 +26,14 @@ const RuleTester = require('eslint').RuleTester;
 
 const ruleTester = new RuleTester();
 
+let graphqlEslintParserPath;
+
+try {
+  graphqlEslintParserPath = require.resolve('@graphql-eslint/eslint-plugin');
+} catch (e) {
+  // ignore
+}
+
 ruleTester.run('prettier', rule, {
   valid: [
     // Correct style.
@@ -77,8 +85,26 @@ ruleTester.run('prettier', rule, {
     {
       code: `('');\n`,
       filename: path.join(__filename, '0_fake_virtual_name.js')
+    },
+    {
+      code: 'ESLintPluginGraphQLFile`type Query {\n  foo: String!\n}`\n',
+      filename: getPrettierRcJsFilename('no-semi', 'dummy.graphql'),
+      parserOptions: {
+        ecmaVersion: 2015
+      }
     }
-  ],
+  ].concat(
+    graphqlEslintParserPath
+      ? {
+          code: `type Query {
+  foo: String!
+}
+`,
+          filename: 'valid.graphql',
+          parser: graphqlEslintParserPath
+        }
+      : []
+  ),
   invalid: [
     '01',
     '02',

test/prettierrc/no-semi/.prettierrc

@@ -0,0 +1,4 @@
+{
+  "semi": false
+}
+