[Tests] add parsers.all helper

Author: ljharb

tests/src/parsers.js

@@ -0,0 +1,158 @@
+'use strict';
+
+// const path = require('path');
+const semver = require('semver');
+const version = require('eslint/package.json').version;
+const flatMap = require('array.prototype.flatmap');
+const tsParserVersion = require('@typescript-eslint/parser/package.json').version;
+
+const disableNewTS = semver.satisfies(tsParserVersion, '>= 4.1') // this rule is not useful on v4.1+ of the TS parser
+  ? (x) => Object.assign({}, x, { features: [].concat(x.features, 'no-ts-new') })
+  : (x) => x;
+
+// const NODE_MODULES = '../../node_modules';
+
+// TODO: consolidate
+import { parsers as utilsParsers } from './utils';
+
+const parsers = {
+  ...utilsParsers,
+  disableNewTS,
+  babelParserOptions: function parserOptions(test, features) {
+    return Object.assign({}, 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: Object.assign(
+        {},
+        test.parserOptions && test.parserOptions.ecmaFeatures,
+        {
+          jsx: true,
+          modules: true,
+          legacyDecorators: features.has('decorators'),
+        },
+      ),
+    });
+  },
+  all: function all(tests) {
+    const t = flatMap(tests, (test) => {
+      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 = test.parserOptions && test.parserOptions.ecmaVersion;
+
+      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) => Object.assign({}, suggestion, {
+                    output: suggestion.output + extraComment,
+                  })),
+                };
+
+                return Object.assign({}, errorObject, nextSuggestions);
+              },
+            ),
+          };
+
+        return Object.assign(
+          {},
+          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') || 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(
+          Object.assign({}, test, features.has('class fields') && {
+            parserOptions: Object.assign({}, test.parserOptions, {
+              ecmaVersion: Math.max((test.parserOptions && test.parserOptions.ecmaVersion) || 0, 2022),
+            }),
+          }),
+          'default',
+        ),
+        skipOldBabel ? [] : addComment(Object.assign({}, test, {
+          parser: parsers.BABEL_ESLINT,
+          parserOptions: parsers.babelParserOptions(test, features),
+        }), 'babel-eslint'),
+        skipNewBabel ? [] : addComment(Object.assign({}, test, {
+          parser: parsers['@BABEL_ESLINT'],
+          parserOptions: parsers.babelParserOptions(test, features),
+        }), '@babel/eslint-parser'),
+        tsOld ? addComment(Object.assign({}, test, { parser: parsers.TYPESCRIPT_ESLINT }), 'typescript-eslint') : [],
+        tsNew ? addComment(Object.assign({}, test, { parser: parsers['@TYPESCRIPT_ESLINT'] }), '@typescript-eslint/parser') : [],
+      );
+    });
+    return t;
+  },
+};
+
+module.exports = parsers;