初始化

cnf

2025-05-10 386fa0eca75ddc88165f9b73038f2a2239e1072e

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
*/
 
"use strict";
 
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const HelperRuntimeModule = require("./HelperRuntimeModule");
 
/** @typedef {import("../Compilation")} Compilation */
 
class DefinePropertyGettersRuntimeModule extends HelperRuntimeModule {
    constructor() {
        super("define property getters");
    }
 
    /**
     * @returns {string | null} runtime code
     */
    generate() {
        const compilation = /** @type {Compilation} */ (this.compilation);
        const { runtimeTemplate } = compilation;
        const fn = RuntimeGlobals.definePropertyGetters;
        return Template.asString([
            "// define getter functions for harmony exports",
            `${fn} = ${runtimeTemplate.basicFunction("exports, definition", [
                "for(var key in definition) {",
                Template.indent([
                    `if(${RuntimeGlobals.hasOwnProperty}(definition, key) && !${RuntimeGlobals.hasOwnProperty}(exports, key)) {`,
                    Template.indent([
                        "Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });"
                    ]),
                    "}"
                ]),
                "}"
            ])};`
        ]);
    }
}
 
module.exports = DefinePropertyGettersRuntimeModule;