Strip IIFEs from files in a directory. You'll need minimist and recursive-readdir. Doesn't work on IIFEs that have args passed in

iifestrip.js

var fs = require('fs');
var path = require('path');
var recursive = require('recursive-readdir');

var argv = require('minimist')(process.argv.slice(2));
var iifepath = path.resolve(process.cwd(), argv.path);

function isIIFEStart (string) {
	// whatever you don't know my life
	return string === '(function () {' ||
			string === '(function(){' ||
			string === '(function() {' ||
			string === '(function (){';
}

function isIIFEEnd (string) {
	return string === '})();' || string === '})()';
}

recursive(iifepath, function (err, files) {
	files.forEach((file) => {
		if (path.extname(file) !== '.js') {
			return;
		}
		if (file.indexOf('test.js') !== -1) {
			return;
		}
		if (file.indexOf('tests.js') !== -1) {
			return;
		}
		if (file.indexOf('spec.js') !== -1) {
			return;
		}
		if (file.indexOf('legacy/tests') !== -1) {
			return;
		}

		var contents = fs.readFileSync(file, 'utf8');
		var lines = contents.split('\n');

		// Find the first line with content
		let firstLineWithContent;
		let i = 0;
		while (i < lines.length) {
			firstLineWithContent = lines[i];
			if (firstLineWithContent !== '') {
				break;
			}
			i++;
		}

		// If it's not an IIFE, abandon
		if (!isIIFEStart(firstLineWithContent)) {
			return;
		}

		let lastLineWithContent;
		// Find the last line with content
		let k = lines.length - 1;
		while (k > 0) {
			lastLineWithContent = lines[k];
			if (lastLineWithContent !== '') {
				break;
			}
			k--;
		}

		// If it's not an IIFE, abandon
		if (!isIIFEEnd(lastLineWithContent)) {
			return;
		}

		// Remove first line
		lines.splice(i, 1);
		// Remove last line (-1 for the removed first line)
		lines.splice(k - 1, 1);

		var strippedFile = lines.join('\n');
		fs.writeFileSync(file, strippedFile, 'utf8');
	});
});