mynode/packages/app-clipper/popup/postinstall.js

const fs = require('fs-extra');
const path = require('path');

const baseDir = path.dirname(path.dirname(__dirname));
const sourcePath = `${__dirname}/../../lib/randomClipperPort.js`;
const clipperUtilsPath = `${__dirname}/../../lib/clipperUtils.js`;

const readFileNormalized = (filePath) => {
	const js = fs.readFileSync(filePath, 'utf-8');
	return js
		.replace(/^['"]use strict['"];/, [
			'\'use strict\';',
			// Running the linter causes changes on each full rebuild, since
			// the original file was generated by tsc.
			'/* eslint-disable */',
			`// Copied from ${path.relative(baseDir, filePath)}`,
			'',
		].join('\n'))

		// Normalize line endings to avoid unnecessary changes on Windows
		.replace(/\r\n/g, '\n')
		.trim();
};

// Mozilla insists on building the clipper from a tarball, not from the repository
// so we add this check and only copy the file if it's present. Normally it rarely
// changes anyway and it is committed to the repo.

if (fs.pathExistsSync(sourcePath)) {
	const content = readFileNormalized(sourcePath);
	fs.writeFileSync(`${__dirname}/src/randomClipperPort.js`, content);
}

if (fs.pathExistsSync(clipperUtilsPath)) {
	fs.copySync(clipperUtilsPath, `${__dirname}/../content_scripts/clipperUtils.js`);
}

// These files give warnings when loading the extension in Chrome, in dev mode
fs.removeSync(`${__dirname}/node_modules/public-encrypt/test/test_key.pem`);
fs.removeSync(`${__dirname}/node_modules/public-encrypt/test/test_rsa_pubkey.pem`);
fs.removeSync(`${__dirname}/node_modules/public-encrypt/test/test_rsa_privkey.pem`);