A dumb way of checking if required parameter is passed

missingRequired.js

function missingRequired() {
	const thisFunc = arguments.callee;
	const caller = thisFunc.caller;
	const passedArgs = caller.arguments;
	const args = caller.toString()
		.replace(/((\/\/.*$)|(\/\*[\s\S]*?\*\/)|(\s))/mg,'') // remove all spacing
		.split(/function\s*\w+\(?/)[1] // remove 'function name ('
		.split(/\)\s*\{/)[0] // remove everything after ){
  		.split(/,/); // break apart into comma separated list of arguments

	args.forEach((arg, index) => {
		const [param, paramDefault] = arg.split('=');
		// If there is a default parameter, and it's name is the same as this
		// function and for this index there was not a passed in value, then we
		// enforce required
		if (paramDefault
			&& paramDefault.match(`${thisFunc.name}`)
			&& !passedArgs[index]
		) {
			throw new Error(`Missing required argument: '${param}'`);
		}
	});
}

function args(required = missingRequired(), alsoRequired = missingRequired(), thing = 2) {
	console.log(alsoRequired)
}

//args() // Error: missing required argument: required
args('test') // Error: missing required argument: alsoRequired
//args('test', 'also test') // 'also test'