mirror of https://github.com/webpack/webpack.git
47 lines
1.4 KiB
JavaScript
47 lines
1.4 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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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} runtime code
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*/
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generate() {
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const fn = RuntimeGlobals.createFakeNamespaceObject;
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return Template.asString([
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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 & 8|1: behave like require",
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`${fn} = function(value, mode) {`,
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Template.indent([
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`if(mode & 1) value = this(value);`,
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`if(mode & 8) return value;`,
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"if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;",
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"var ns = Object.create(null);",
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`${RuntimeGlobals.makeNamespaceObject}(ns);`,
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"Object.defineProperty(ns, 'default', { enumerable: true, value: value });",
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"if(mode & 2 && typeof value != 'string') for(var key in value) " +
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`${RuntimeGlobals.definePropertyGetter}(ns, key, function(key) { ` +
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"return value[key]; " +
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"}.bind(null, key));",
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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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