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: / lib / nodejs / prepend-http /

Filename : index.js

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'use strict';
module.exports = (url, opts) => {
	if (typeof url !== 'string') {
		throw new TypeError(`Expected \`url\` to be of type \`string\`, got \`${typeof url}\``);
	}

	url = url.trim();
	opts = Object.assign({https: false}, opts);

	if (/^\.*\/|^(?!localhost)\w+:/.test(url)) {
		return url;
	}

	return url.replace(/^(?!(?:\w+:)?\/\/)/, opts.https ? 'https://' : 'http://');
};