mirror of https://github.com/webpack/webpack.git
70 lines
2.4 KiB
JavaScript
70 lines
2.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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const HelperRuntimeModule = require("./HelperRuntimeModule");
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/** @typedef {import("../Compilation")} Compilation */
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class CreateFakeNamespaceObjectRuntimeModule extends HelperRuntimeModule {
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constructor() {
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super("create fake namespace object");
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}
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/**
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* @returns {string | null} runtime code
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*/
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generate() {
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const compilation = /** @type {Compilation} */ (this.compilation);
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const { runtimeTemplate } = compilation;
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const fn = RuntimeGlobals.createFakeNamespaceObject;
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return Template.asString([
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`var getProto = Object.getPrototypeOf ? ${runtimeTemplate.returningFunction(
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"Object.getPrototypeOf(obj)",
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"obj"
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)} : ${runtimeTemplate.returningFunction("obj.__proto__", "obj")};`,
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"var leafPrototypes;",
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"// create a fake namespace object",
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"// mode & 1: value is a module id, require it",
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"// mode & 2: merge all properties of value into the ns",
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"// mode & 4: return value when already ns object",
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"// mode & 16: return value when it's Promise-like",
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"// mode & 8|1: behave like require",
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// Note: must be a function (not arrow), because this is used in body!
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`${fn} = function(value, mode) {`,
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Template.indent([
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"if(mode & 1) value = this(value);",
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"if(mode & 8) return value;",
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"if(typeof value === 'object' && value) {",
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Template.indent([
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"if((mode & 4) && value.__esModule) return value;",
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"if((mode & 16) && typeof value.then === 'function') return value;"
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]),
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"}",
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"var ns = Object.create(null);",
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`${RuntimeGlobals.makeNamespaceObject}(ns);`,
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"var def = {};",
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"leafPrototypes = leafPrototypes || [null, getProto({}), getProto([]), getProto(getProto)];",
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"for(var current = mode & 2 && value; (typeof current == 'object' || typeof current == 'function') && !~leafPrototypes.indexOf(current); current = getProto(current)) {",
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Template.indent([
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`Object.getOwnPropertyNames(current).forEach(${runtimeTemplate.expressionFunction(
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`def[key] = ${runtimeTemplate.returningFunction("value[key]", "")}`,
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"key"
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)});`
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]),
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"}",
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`def['default'] = ${runtimeTemplate.returningFunction("value", "")};`,
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`${RuntimeGlobals.definePropertyGetters}(ns, def);`,
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"return ns;"
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]),
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"};"
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]);
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}
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}
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module.exports = CreateFakeNamespaceObjectRuntimeModule;
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