Extracts sources form a sourcemap - quick and dirty

extract.js

const sourceMap = require('source-map');
const fs = require('fs');
const path = require('path');
const fg = require('fast-glob');

(async function() {
	const entries = await fg('*.map');
	entries.forEach(async (fname) => {
		const consumer = await new sourceMap.SourceMapConsumer(JSON.parse(fs.readFileSync(fname)));
		for (const source of consumer.sources) {
			const code = consumer.sourceContentFor(source);
			const file = source.replace('webpack://', './');
			fs.mkdirSync(path.dirname(file), { recursive: true });
			fs.writeFileSync(file, code);
		}
	});
})();