mirror of https://github.com/webpack/webpack.git
58 lines
1.6 KiB
JavaScript
58 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 { ConcatSource, RawSource } = require("webpack-sources");
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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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class JsonGenerator {
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generate(module, dependencyTemplates, runtimeTemplate) {
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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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let finalJson;
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if (
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Array.isArray(module.buildMeta.providedExports) &&
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!module.isUsed("default")
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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 module.buildMeta.providedExports) {
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if (exportName === "default") 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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finalJson = reducedJson;
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} else {
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finalJson = data;
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}
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// Use JSON because JSON.parse() is much faster than JavaScript evaluation
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const jsonSource = JSON.stringify(stringifySafe(finalJson));
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const jsonExpr = `JSON.parse(${jsonSource})`;
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source.add(`${module.moduleArgument}.exports = ${jsonExpr};`);
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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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