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'use strict';
module.exports = function (url) {
if (typeof url !== 'string') {
throw new TypeError('Expected a string, got ' + typeof url);
}
url = url.trim();
if (/^\.*\/|^(?!localhost)\w+:/.test(url)) {
return url;
}
return url.replace(/^(?!(?:\w+:)?\/\/)/, 'http://');
};
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