Poor man's derequire

derequire.js

#!/usr/bin/env node

let i = "";
process.stdin.on("readable", () => {
	let chunk;
	while (null !== (chunk = process.stdin.read())) {
		i += chunk.toString();
	}
});
process.stdin.on("end", () => {
	process.stderr.write("Recieved input file\n");

	// derequire stuff
	i = i.split("require").join("_dereq_");


	process.stderr.write("Building blacklist...\n");
	let blacklist = new Set();
	// parse browserify output
	let r1 = /\},\{(?:(?:".+":(?:\d+|undefined),?)+)\}\],\d+:\[function\(_dereq_,module,exports/g;
	let a;
	while (a = r1.exec(i)) {
		let r2 = /"([^"]+)":undefined/g;
		let b;
		while (b = r2.exec(a[0])) {
			blacklist.add(b[1]);
		}
	}

	process.stderr.write("Reverting " + blacklist.size + " dependencies...\n");
	// revert unknown dependencies; hopefully webpack can find them
	i = i.replace(new RegExp(`_dereq_(\\s*\\((['"])(?:${[...blacklist].join("|").split("/").join("\\/")})\\2\\s*\\))`, "g"), "require$1")
		// allow bypassing browserify entirely
		.split("global.nativeRequire").join("require");

	process.stderr.write("Finished transform\n");
	process.stdout.end(i);
});