Use Prettier Config API (#11980)

.prettierrc.js

@@ -0,0 +1,18 @@
+const {esNextPaths} = require('./scripts/shared/pathsByLanguageVersion');
+
+module.exports = {
+  bracketSpacing: false,
+  singleQuote: true,
+  jsxBracketSameLine: true,
+  trailingComma: 'es5',
+  printWidth: 80,
+
+  overrides: [
+    {
+      files: esNextPaths,
+      options: {
+        trailingComma: 'all',
+      },
+    },
+  ],
+};

scripts/prettier/index.js

@@ -7,74 +7,44 @@
 'use strict';
 
 // Based on similar script in Jest
-// https://github.com/facebook/jest/blob/master/scripts/prettier.js
+// https://github.com/facebook/jest/blob/a7acc5ae519613647ff2c253dd21933d6f94b47f/scripts/prettier.js
 
 const chalk = require('chalk');
 const glob = require('glob');
 const prettier = require('prettier');
 const fs = require('fs');
 const listChangedFiles = require('../shared/listChangedFiles');
-const {esNextPaths} = require('../shared/pathsByLanguageVersion');
+const prettierConfigPath = require.resolve('../../.prettierrc');
 
 const mode = process.argv[2] || 'check';
 const shouldWrite = mode === 'write' || mode === 'write-changed';
 const onlyChanged = mode === 'check-changed' || mode === 'write-changed';
 
-const defaultOptions = {
-  bracketSpacing: false,
-  singleQuote: true,
-  jsxBracketSameLine: true,
-  trailingComma: 'all',
-  printWidth: 80,
-};
-const config = {
-  default: {
-    patterns: ['**/*.js'],
-    ignore: [
-      '**/node_modules/**',
-      // ESNext paths can have trailing commas.
-      // We'll handle them separately below.
-      ...esNextPaths,
-    ],
-    options: {
-      trailingComma: 'es5',
-    },
-  },
-  esNext: {
-    patterns: [...esNextPaths],
-    ignore: ['**/node_modules/**'],
-  },
-};
-
 const changedFiles = onlyChanged ? listChangedFiles() : null;
 let didWarn = false;
 let didError = false;
-Object.keys(config).forEach(key => {
-  const patterns = config[key].patterns;
-  const options = config[key].options;
-  const ignore = config[key].ignore;
 
-  const globPattern =
-    patterns.length > 1 ? `{${patterns.join(',')}}` : `${patterns.join(',')}`;
 const files = glob
-    .sync(globPattern, {ignore})
+  .sync('**/*.js', {ignore: '**/node_modules/**'})
   .filter(f => !onlyChanged || changedFiles.has(f));
 
 if (!files.length) {
   return;
 }
 
-  const args = Object.assign({}, defaultOptions, options);
 files.forEach(file => {
+  const options = prettier.resolveConfig.sync(file, {
+    config: prettierConfigPath,
+  });
   try {
     const input = fs.readFileSync(file, 'utf8');
     if (shouldWrite) {
-        const output = prettier.format(input, args);
+      const output = prettier.format(input, options);
       if (output !== input) {
         fs.writeFileSync(file, output, 'utf8');
       }
     } else {
-        if (!prettier.check(input, args)) {
+      if (!prettier.check(input, options)) {
         if (!didWarn) {
           console.log(
             '\n' +
@@ -99,7 +69,6 @@ Object.keys(config).forEach(key => {
     console.log(file);
   }
 });
-});
 
 if (didWarn || didError) {
   process.exit(1);