mirror of https://github.com/webpack/webpack.git
42 lines
1.0 KiB
JavaScript
42 lines
1.0 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 DefinePropertyGettersRuntimeModule extends HelperRuntimeModule {
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constructor() {
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super("define property getters");
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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.definePropertyGetters;
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return Template.asString([
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"// define getter functions for harmony exports",
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"var hasOwnProperty = Object.prototype.hasOwnProperty;",
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`${fn} = function(exports, definition) {`,
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Template.indent([
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`for(var key in definition) {`,
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Template.indent([
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"if(hasOwnProperty.call(definition, key) && !hasOwnProperty.call(exports, key)) {",
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Template.indent([
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"Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });"
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]),
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"}"
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]),
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"}"
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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 = DefinePropertyGettersRuntimeModule;
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