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lib/runtime/CompatGetDefaultExportRuntimeModule.js
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Xiao
perf(runtime): skip IIFE wrapping for RuntimeModules without locals (#21633)
09 авг 2026, 17:30
Не верифицирован
09 авг 2026, 17:30
22b12df
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/* MIT License http://www.opensource.org/licenses/mit-license.php */ "use strict"; const RuntimeGlobals = require("../RuntimeGlobals"); const Template = require("../Template"); const HelperRuntimeModule = require("./HelperRuntimeModule"); /** @typedef {import("../Compilation")} Compilation */ class CompatGetDefaultExportRuntimeModule extends HelperRuntimeModule { constructor() { super("compat get default export"); } /** * Returns true, if the runtime module should get it's own scope. * When false, `generate()` must emit complete statements ending with `;` * so a following runtime IIFE is not parsed as a call (ASI). * @returns {boolean} true, if the runtime module should get it's own scope */ shouldIsolate() { return false; } /** * Generates runtime code for this runtime module. * @returns {string | null} runtime code */ generate() { const compilation = /** @type {Compilation} */ (this.compilation); const { runtimeTemplate } = compilation; const fn = RuntimeGlobals.compatGetDefaultExport; return Template.asString([ "// getDefaultExport function for compatibility with non-harmony modules", `${fn} = ${runtimeTemplate.basicFunction("module", [ `${runtimeTemplate.renderConst()} getter = module && module.__esModule ?`, Template.indent([ `${runtimeTemplate.returningFunction("module['default']")} :`, `${runtimeTemplate.returningFunction("module")};` ]), `${RuntimeGlobals.definePropertyGetters}(getter, { a: getter });`, "return getter;" ])};` ]); } } module.exports = CompatGetDefaultExportRuntimeModule;