[Tests] migrate helper parsers function from eslint-plugin-react

Co-authored-by: Ross Rosales <52366381+ROSSROSALES@users.noreply.github.com>
Co-authored-by: Jordan Harband <ljharb@gmail.com>

Author: ROSSROSALES

__tests__/__util__/helpers/getESLintCoreRule.js

@@ -0,0 +1,9 @@
+import { version } from 'eslint/package.json';
+import semver from 'semver';
+
+const isESLintV8 = semver.major(version) >= 8;
+
+// eslint-disable-next-line global-require, import/no-dynamic-require, import/no-unresolved
+const getESLintCoreRule = (ruleId) => (isESLintV8 ? require('eslint/use-at-your-own-risk').builtinRules.get(ruleId) : require(`eslint/lib/rules/${ruleId}`));
+
+export default getESLintCoreRule;

__tests__/__util__/helpers/parsers.js

@@ -0,0 +1,186 @@
+import path from 'path';
+import semver from 'semver';
+import entries from 'object.entries';
+import { version } from 'eslint/package.json';
+import flatMap from 'array.prototype.flatmap';
+
+let tsParserVersion;
+try {
+  // eslint-disable-next-line import/no-unresolved, global-require
+  tsParserVersion = require('@typescript-eslint/parser/package.json').version;
+} catch (e) { /**/ }
+
+const disableNewTS = semver.satisfies(tsParserVersion, '>= 4.1') // this rule is not useful on v4.1+ of the TS parser
+  ? (x) => ({ ...x, features: [].concat(x.features, 'no-ts-new') })
+  : (x) => x;
+
+function minEcmaVersion(features, parserOptions) {
+  const minEcmaVersionForFeatures = {
+    'class fields': 2022,
+    'optional chaining': 2020,
+    'nullish coalescing': 2020,
+  };
+  const result = Math.max(
+    ...[].concat(
+      (parserOptions && parserOptions.ecmaVersion) || [],
+      flatMap(entries(minEcmaVersionForFeatures), (entry) => {
+        const f = entry[0];
+        const y = entry[1];
+        return features.has(f) ? y : [];
+      }),
+    ).map((y) => (y > 5 && y < 2015 ? y + 2009 : y)), // normalize editions to years
+  );
+  return Number.isFinite(result) ? result : undefined;
+}
+
+const NODE_MODULES = '../../node_modules';
+
+const parsers = {
+  BABEL_ESLINT: path.join(__dirname, NODE_MODULES, 'babel-eslint'),
+  '@BABEL_ESLINT': path.join(__dirname, NODE_MODULES, '@babel/eslint-parser'),
+  TYPESCRIPT_ESLINT: path.join(__dirname, NODE_MODULES, 'typescript-eslint-parser'),
+  '@TYPESCRIPT_ESLINT': path.join(__dirname, NODE_MODULES, '@typescript-eslint/parser'),
+  disableNewTS,
+  babelParserOptions: function parserOptions(test, features) {
+    return {
+      ...test.parserOptions,
+      requireConfigFile: false,
+      babelOptions: {
+        presets: [
+          '@babel/preset-react',
+        ],
+        plugins: [
+          '@babel/plugin-syntax-do-expressions',
+          '@babel/plugin-syntax-function-bind',
+          ['@babel/plugin-syntax-decorators', { legacy: true }],
+        ],
+        parserOpts: {
+          allowSuperOutsideMethod: false,
+          allowReturnOutsideFunction: false,
+        },
+      },
+      ecmaFeatures: {
+
+        ...test.parserOptions && test.parserOptions.ecmaFeatures,
+        jsx: true,
+        modules: true,
+        legacyDecorators: features.has('decorators'),
+      },
+    };
+  },
+  all: function all(tests) {
+    const t = flatMap(tests, (test) => {
+      /* eslint no-param-reassign: 0 */
+      if (typeof test === 'string') {
+        test = { code: test };
+      }
+      if ('parser' in test) {
+        delete test.features;
+        return test;
+      }
+      const features = new Set([].concat(test.features || []));
+      delete test.features;
+
+      const es = minEcmaVersion(features, test.parserOptions);
+
+      function addComment(testObject, parser) {
+        const extras = [].concat(
+          `features: [${Array.from(features).join(',')}]`,
+          `parser: ${parser}`,
+          testObject.parserOptions ? `parserOptions: ${JSON.stringify(testObject.parserOptions)}` : [],
+          testObject.options ? `options: ${JSON.stringify(testObject.options)}` : [],
+          testObject.settings ? `settings: ${JSON.stringify(testObject.settings)}` : [],
+        );
+
+        const extraComment = `\n// ${extras.join(', ')}`;
+
+        // Augment expected fix code output with extraComment
+        const nextCode = { code: testObject.code + extraComment };
+        const nextOutput = testObject.output && { output: testObject.output + extraComment };
+
+        // Augment expected suggestion outputs with extraComment
+        // `errors` may be a number (expected number of errors) or an array of
+        // error objects.
+        const nextErrors = testObject.errors
+          && typeof testObject.errors !== 'number'
+          && {
+            errors: testObject.errors.map(
+              (errorObject) => {
+                const nextSuggestions = errorObject.suggestions && {
+                  suggestions: errorObject.suggestions.map((suggestion) => ({ ...suggestion, output: suggestion.output + extraComment })),
+                };
+
+                return { ...errorObject, ...nextSuggestions };
+              },
+            ),
+          };
+
+        return {
+
+          ...testObject,
+          ...nextCode,
+          ...nextOutput,
+          ...nextErrors,
+        };
+      }
+
+      const skipBase = (features.has('class fields') && semver.satisfies(version, '< 8'))
+        || (es >= 2020 && semver.satisfies(version, '< 6'))
+        || features.has('no-default')
+        || features.has('bind operator')
+        || features.has('do expressions')
+        || features.has('decorators')
+        || features.has('flow')
+        || features.has('ts')
+        || features.has('types')
+        || (features.has('fragment') && semver.satisfies(version, '< 5'));
+
+      const skipBabel = features.has('no-babel');
+      const skipOldBabel = skipBabel
+        || features.has('no-babel-old')
+        || features.has('optional chaining')
+        || semver.satisfies(version, '>= 8');
+      const skipNewBabel = skipBabel
+        || features.has('no-babel-new')
+        || !semver.satisfies(version, '^7.5.0') // require('@babel/eslint-parser/package.json').peerDependencies.eslint
+        || features.has('flow')
+        || features.has('types')
+        || features.has('ts');
+      const skipTS = semver.satisfies(version, '<= 5') // TODO: make these pass on eslint 5
+        || features.has('no-ts')
+        || features.has('flow')
+        || features.has('jsx namespace')
+        || features.has('bind operator')
+        || features.has('do expressions');
+      const tsOld = !skipTS && !features.has('no-ts-old');
+      const tsNew = !skipTS && !features.has('no-ts-new');
+
+      return [].concat(
+        skipBase ? [] : addComment(
+          {
+            ...test,
+            ...typeof es === 'number' && {
+              parserOptions: { ...test.parserOptions, ecmaVersion: es },
+            },
+          },
+          'default',
+        ),
+        skipOldBabel ? [] : addComment({
+          ...test,
+          parser: parsers.BABEL_ESLINT,
+          parserOptions: parsers.babelParserOptions(test, features),
+        }, 'babel-eslint'),
+        skipNewBabel ? [] : addComment({
+          ...test,
+          parser: parsers['@BABEL_ESLINT'],
+          parserOptions: parsers.babelParserOptions(test, features),
+        }, '@babel/eslint-parser'),
+        tsOld ? addComment({ ...test, parser: parsers.TYPESCRIPT_ESLINT }, 'typescript-eslint') : [],
+        tsNew ? addComment({ ...test, parser: parsers['@TYPESCRIPT_ESLINT'] }, '@typescript-eslint/parser') : [],
+      );
+    });
+    return t;
+  },
+};
+
+export default parsers;