mirror of https://github.com/webpack/webpack.git
90 lines
2.5 KiB
JavaScript
90 lines
2.5 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, RawSource } = require("webpack-sources");
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const Generator = require("./Generator");
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const { UsageState } = require("./ModuleGraph");
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const RuntimeGlobals = require("./RuntimeGlobals");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("./Generator").GenerateContext} GenerateContext */
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/** @typedef {import("./NormalModule")} NormalModule */
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const stringifySafe = data => {
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const stringified = JSON.stringify(data);
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if (!stringified) {
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return undefined; // Invalid JSON
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}
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return stringified.replace(/\u2028|\u2029/g, str =>
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str === "\u2029" ? "\\u2029" : "\\u2028"
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); // invalid in JavaScript but valid JSON
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};
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const TYPES = new Set(["javascript"]);
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class JsonGenerator extends Generator {
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/**
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* @returns {Set<string>} available types (do not mutate)
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*/
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getTypes() {
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return TYPES;
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}
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/**
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* @param {NormalModule} module the module
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* @param {string=} type source type
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* @returns {number} estimate size of the module
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*/
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getSize(module, type) {
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let data = module.buildInfo.jsonData;
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if (!data) return 0;
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return stringifySafe(data).length + 10;
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}
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/**
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* @param {NormalModule} module module for which the code should be generated
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* @param {GenerateContext} generateContext context for generate
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* @returns {Source} generated code
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*/
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generate(module, { moduleGraph, runtimeTemplate, runtimeRequirements }) {
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const source = new ConcatSource();
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const data = module.buildInfo.jsonData;
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if (data === undefined) {
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return new RawSource(
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runtimeTemplate.missingModuleStatement({
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request: module.rawRequest
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})
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);
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}
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runtimeRequirements.add(RuntimeGlobals.module);
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const providedExports = moduleGraph.getProvidedExports(module);
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if (
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Array.isArray(providedExports) &&
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module.isExportUsed(moduleGraph, "default") === UsageState.Unused
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) {
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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 providedExports) {
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if (exportName === "default") continue;
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const used = module.getUsedName(moduleGraph, exportName);
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if (typeof used === "string") {
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reducedJson[used] = data[exportName];
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}
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}
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source.add(
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`${module.moduleArgument}.exports = ${stringifySafe(reducedJson)};`
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);
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} else {
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source.add(`${module.moduleArgument}.exports = ${stringifySafe(data)};`);
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}
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return source;
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}
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}
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module.exports = JsonGenerator;
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