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rOACCT/node_modules/react-dev-utils/evalSourceMapMiddleware.js
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evalSourceMapMiddleware.js
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			/**
			* 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:///<module-id>"
			* Returns a generated source: "<source-text><sourceMappingURL><sourceURL>"
			*
			* 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();
			}
			};
			};