rusackas commented on code in PR #45595: URL: https://github.com/apache/superset/pull/45595#discussion_r4373754504
########## superset-frontend/spec/helpers/swcJestTransformer.js: ########## @@ -0,0 +1,135 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +import { createTransformer as createSwcTransformer } from '@swc/jest'; + +/** + * Jest transformer: @swc/jest plus one post-processing step. + * + * SWC's CommonJS output defines every ESM export as a lazy, non-configurable + * getter, which is why `jest.spyOn(module, 'name')` and + * `jest.replaceProperty(module, 'name', value)` throw "Cannot redefine + * property" on anything SWC transformed. Babel's output defined plain + * properties, so the suite relies on spying on module exports everywhere. + * This wrapper marks those getters `configurable: true` so the spies keep + * working, while leaving the getters lazy (an eager rewrite would break + * modules that import each other in a cycle). + * + * The second difference is what a module in an import cycle sees when it + * reads an export that has not been initialised yet. Babel assigns + * `exports.name = void 0` up front, so the read yields `undefined`; SWC's + * getter returns the live binding and throws a ReferenceError (temporal dead + * zone) instead. Several suites spread `jest.requireActual()` of a module + * that is still mid-evaluation, so the getters are made lenient to match + * Babel: an uninitialised export reads as `undefined`. + */ +// SWC keeps a leading doc comment of a default export inside the call, as +// `Object.defineProperty(exports, /** ... */ "default", {`, hence the optional +// block comment before the name. +const EXPORT_GETTER_DESCRIPTOR = + /(Object\.defineProperty\((?:target, name|to, k|exports,\s*(?:\/\*[\s\S]*?\*\/\s*)?"[^"]+"), \{\s*enumerable: true,)(\s*)(get:)/g; +// `_export(exports, { get name () { return binding; }, ... });` is how SWC +// declares named exports; the leniency below is scoped to this block and to +// the `Object.defineProperty(exports, ...)` descriptors, never to getters in +// application code. +const EXPORT_BLOCK = /_export\(exports, \{[\s\S]*?\n\}\);/g; +const EXPORT_BLOCK_GETTER = + /(get [\w$]+ \(\) \{\s*)return ([\w$]+(?:\.[\w$]+)*);/g; +// The `get: function() { return binding; }` form SWC uses for a single export +// or a re-export (`from[k]`), matched together with its descriptor. +const EXPORT_DESCRIPTOR_GETTER = + /(Object\.defineProperty\((?:target, name|to, k|exports,\s*(?:\/\*[\s\S]*?\*\/\s*)?"[^"]+"), \{\s*enumerable: true,\s*)(get: function\(\) \{\s*)return ([\w$]+(?:\.[\w$]+)*|from\[k\]);/g; Review Comment: Done in 6dcb5d4: the optional comment group now accepts `//` line comments as well as `/* */`, and the no-match guard also covers the direct `Object.defineProperty(exports, ...)` form. Added fixtures for the line-commented default export. ########## superset-frontend/spec/helpers/swcJestTransformer.test.js: ########## @@ -0,0 +1,110 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +import { mirrorBabelExportSemantics } from './swcJestTransformer'; + +// The export-helper text is interpolated so this file is not itself rewritten +// by the transformer when Jest loads it; the fixtures stay raw SWC-shaped input. +const EXPORT_FN = '_export'; +const DEFINE = 'defineProperty'; +const GET = 'get'; +const helper = `function ${EXPORT_FN}(target, all) { + for(var name in all)Object.${DEFINE}(target, name, { + enumerable: true, + ${GET}: Object.getOwnPropertyDescriptor(all, name).get + }); +}`; +const exportsBlock = body => `${EXPORT_FN}(exports, { +${body} +});`; + +const NAMED_EXPORTS = `"use strict"; +Object.${DEFINE}(exports, "__esModule", { + value: true +}); +${helper} +${exportsBlock(` ${GET} answer () { + return answer; + }`)} +const answer = 42; +`; + +function load(code) { + const mod = { exports: {} }; + // eslint-disable-next-line no-new-func + new Function('module', 'exports', code)(mod, mod.exports); + return mod.exports; +} + +test('named exports become configurable so jest.spyOn works', () => { + const exports = load(mirrorBabelExportSemantics(NAMED_EXPORTS)); Review Comment: Added fixtures for a doc-commented `"default"` descriptor and a `from[k]` re-export (both assert configurable and lenient), plus a `createTransformer` test covering sync/async output and the cache salt. -- This is an automated message from the Apache Git Service. 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