86 lines
2.4 KiB
JavaScript
86 lines
2.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { ConcatSource } = require("webpack-sources");
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const { UsageState } = require("./ModuleGraph");
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const JavascriptModulesPlugin = require("./javascript/JavascriptModulesPlugin");
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/** @typedef {import("./Compiler")} Compiler */
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/**
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* @param {string[]} accessor the accessor to convert to path
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* @returns {string} the path
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*/
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const accessorToObjectAccess = accessor => {
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return accessor.map(a => `[${JSON.stringify(a)}]`).join("");
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};
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class ExportPropertyTemplatePlugin {
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/**
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* @param {string|string[]} property the name of the property to export
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* @param {string} explanation an explanation why this property is used
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*/
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constructor(property, explanation) {
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this.property = property;
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this.explanation = explanation;
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}
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/**
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.thisCompilation.tap(
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"ExportPropertyTemplatePlugin",
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compilation => {
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const moduleGraph = compilation.moduleGraph;
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compilation.hooks.seal.tap("ExportPropertyTemplatePlugin", () => {
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for (const { dependencies: deps } of compilation.entries.values()) {
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const dep = deps[deps.length - 1];
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if (dep) {
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const module = moduleGraph.getModule(dep);
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if (module) {
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const exportsInfo = moduleGraph.getExportInfo(
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module,
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Array.isArray(this.property)
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? this.property[0]
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: this.property
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);
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exportsInfo.used = UsageState.Used;
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exportsInfo.canMangleUse = false;
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moduleGraph.addExtraReason(module, this.explanation);
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}
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}
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}
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});
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const hooks = JavascriptModulesPlugin.getCompilationHooks(compilation);
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hooks.render.tap(
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"ExportPropertyTemplatePlugin",
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(source, { chunk, chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return source;
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const postfix = accessorToObjectAccess([].concat(this.property));
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return new ConcatSource(source, postfix);
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}
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);
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hooks.chunkHash.tap(
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"ExportPropertyTemplatePlugin",
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(chunk, hash, { chunkGraph }) => {
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if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return;
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hash.update("export property");
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hash.update(`${this.property}`);
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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 = ExportPropertyTemplatePlugin;
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