mirror of https://github.com/webpack/webpack.git
50 lines
1.6 KiB
JavaScript
50 lines
1.6 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 JsonParser = require("./JsonParser");
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const ConcatSource = require("webpack-sources").ConcatSource;
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const stringifySafe = data => JSON.stringify(data)
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.replace(/\u2028|\u2029/g, str => str === "\u2029" ? "\\u2029" : "\\u2028"); // invalid in JavaScript but valid JSON
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class JsonModulesPlugin {
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apply(compiler) {
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compiler.hooks.compilation.tap("JsonModulesPlugin", (compilation, {
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normalModuleFactory
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}) => {
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normalModuleFactory.hooks.createParser.for("json").tap("JsonModulesPlugin", () => {
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return new JsonParser();
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});
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compilation.moduleTemplates.javascript.hooks.content.tap("JsonModulesPlugin", (moduleSource, module) => {
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if(module.type && module.type.startsWith("json")) {
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const source = new ConcatSource();
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const data = module.buildInfo.jsonData;
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if(Array.isArray(module.buildMeta.providedExports) && !module.isUsed("default")) {
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// Only some exports are used: We can optimize here, by only generating a part of the JSON
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const reducedJson = {};
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for(const exportName of module.buildMeta.providedExports) {
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if(exportName === "default")
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continue;
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const used = module.isUsed(exportName);
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if(used) {
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reducedJson[used] = data[exportName];
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}
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}
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source.add(`${module.moduleArgument}.exports = ${stringifySafe(reducedJson)};`);
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} else {
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source.add(`${module.moduleArgument}.exports = ${stringifySafe(data)};`);
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}
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return source;
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} else {
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return moduleSource;
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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 = JsonModulesPlugin;
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