mirror of https://github.com/webpack/webpack.git
59 lines
1.8 KiB
JavaScript
59 lines
1.8 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 { runtimeTemplate } = this.compilation;
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const modern =
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runtimeTemplate.supportsArrowFunction() &&
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runtimeTemplate.supportsConst();
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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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// Note: must be a function (not arrow), because this is used in body!
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`${fn} = function(value, mode) {`,
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Template.indent([
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`if(mode & 1) value = this(value);`,
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`if(mode & 8) return value;`,
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"if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;",
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"var ns = Object.create(null);",
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`${RuntimeGlobals.makeNamespaceObject}(ns);`,
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"var def = {};",
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"if(mode & 2 && typeof value == 'object' && value) {",
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Template.indent([
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modern
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? `for(const key in value) def[key] = () => value[key];`
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: `for(var key in value) def[key] = function(key) { return value[key]; }.bind(null, key);`
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]),
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"}",
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modern
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? "def['default'] = () => value;"
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: "def['default'] = function() { return 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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