index.js

'use strict';

var inspect = require('util').inspect;

module.exports = function isResolvable(moduleId, options) {
	if (typeof moduleId !== 'string') {
		throw new TypeError(inspect(moduleId) + ' is not a string. Expected a valid Node.js module identifier (<string>), for example \'eslint\', \'./index.js\', \'./lib\'.');
	}

	try {
		require.resolve(moduleId, options);
		return true;
	} catch (err) {
		return false;
	}
};