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66 lines
2.3 KiB
66 lines
2.3 KiB
/* |
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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 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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`${RuntimeGlobals.makeNamespaceObject}(ns);`, |
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"var def = {};", |
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"leafPrototypes = leafPrototypes || [null, getProto({}), getProto([]), getProto(getProto)];", |
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"for(var current = mode & 2 && value; typeof current == 'object' && !~leafPrototypes.indexOf(current); current = getProto(current)) {", |
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Template.indent([ |
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`Object.getOwnPropertyNames(current).forEach(${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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