/** * Copyright (c) 2015-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ 'use strict'; function base64SourceMap(source) { const base64 = Buffer.from(JSON.stringify(source.map()), 'utf8').toString( 'base64' ); return `data:application/json;charset=utf-8;base64,${base64}`; } function getSourceById(server, id) { const module = Array.from(server._stats.compilation.modules).find( (m) => server._stats.compilation.chunkGraph.getModuleId(m) == id, ); return module.originalSource(); } /* * Middleware responsible for retrieving a generated source * Receives a webpack internal url: "webpack-internal:///" * Returns a generated source: "" * * Based on EvalSourceMapDevToolModuleTemplatePlugin.js */ module.exports = function createEvalSourceMapMiddleware(server) { return function handleWebpackInternalMiddleware(req, res, next) { if (req.url.startsWith('/__get-internal-source')) { const fileName = req.query.fileName; const id = fileName.match(/webpack-internal:\/\/\/(.+)/)[1]; if (!id || !server._stats) { next(); } const source = getSourceById(server, id); const sourceMapURL = `//# sourceMappingURL=${base64SourceMap(source)}`; const sourceURL = `//# sourceURL=webpack-internal:///${module.id}`; res.end(`${source.source()}\n${sourceMapURL}\n${sourceURL}`); } else { next(); } }; };