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4 years ago
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { ConcatSource, RawSource } = require("webpack-sources");
const stringifySafe = data => {
const stringified = JSON.stringify(data);
if (!stringified) {
return undefined; // Invalid JSON
}
return stringified.replace(/\u2028|\u2029/g, str =>
str === "\u2029" ? "\\u2029" : "\\u2028"
); // invalid in JavaScript but valid JSON
};
class JsonGenerator {
generate(module, dependencyTemplates, runtimeTemplate) {
const source = new ConcatSource();
const data = module.buildInfo.jsonData;
if (data === undefined) {
return new RawSource(
runtimeTemplate.missingModuleStatement({
request: module.rawRequest
})
);
}
let finalJson;
if (
Array.isArray(module.buildMeta.providedExports) &&
!module.isUsed("default")
) {
// Only some exports are used: We can optimize here, by only generating a part of the JSON
const reducedJson = {};
for (const exportName of module.buildMeta.providedExports) {
if (exportName === "default") continue;
const used = module.isUsed(exportName);
if (used) {
reducedJson[used] = data[exportName];
}
}
finalJson = reducedJson;
} else {
finalJson = data;
}
// Use JSON because JSON.parse() is much faster than JavaScript evaluation
const jsonSource = JSON.stringify(stringifySafe(finalJson));
const jsonExpr = `JSON.parse(${jsonSource})`;
source.add(`${module.moduleArgument}.exports = ${jsonExpr};`);
return source;
}
}
module.exports = JsonGenerator;