Unify ESLint and Prettier across xplat/yoga (#1335)

Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1335

Reviewed By: christophpurrer

Differential Revision: D47459866

fbshipit-source-id: fd6b4e4e2518d91968ac7180b32129b3f70edf88

.eslintrc.js

@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+module.exports = {
+  root: true,
+  ignorePatterns: [
+    '/website',
+    '**/binaries/**',
+    '**/build/**',
+    '**/generated/**',
+  ],
+  extends: ['eslint:recommended', 'plugin:prettier/recommended'],
+  plugins: ['prettier'],
+  rules: {
+    'no-unused-vars': ['error', {argsIgnorePattern: '^_'}],
+    'no-var': 'error',
+    'prefer-arrow-callback': 'error',
+    'prefer-const': 'error',
+    'prefer-object-spread': 'error',
+    'prefer-spread': 'error',
+    'require-await': 'error',
+  },
+  env: {
+    commonjs: true,
+    es2018: true,
+  },
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 'latest',
+  },
+  overrides: [
+    {
+      files: ['**/*.ts', '**/*.tsx'],
+      extends: ['plugin:@typescript-eslint/recommended'],
+      parser: '@typescript-eslint/parser',
+      parserOptions: {
+        project: true,
+      },
+      plugins: ['@typescript-eslint'],
+      rules: {
+        '@typescript-eslint/ban-ts-comment': 'off',
+        '@typescript-eslint/no-unused-vars': [
+          'error',
+          {argsIgnorePattern: '^_'},
+        ],
+        '@typescript-eslint/no-var-requires': 'off',
+      },
+    },
+    {
+      files: ['**/.eslintrc.js', '**/just.config.js'],
+      env: {
+        node: true,
+      },
+    },
+    {
+      files: ['jest.*', '**/tests/**'],
+      env: {
+        node: true,
+      },
+      extends: ['plugin:jest/recommended'],
+      globals: {
+        getMeasureCounter: 'writable',
+        getMeasureCounterMax: 'writable',
+        getMeasureCounterMin: 'writable',
+        Yoga: 'writable',
+        YGBENCHMARK: 'writable',
+      },
+    },
+  ],
+};