$ cnpm install is-relative-url
Check if an URL is relative
$ npm install is-relative-url
const isRelativeUrl = require('is-relative-url');
isRelativeUrl('foo/bar');
//=> true
isRelativeUrl('https://sindresorhus.com/foo/bar');
//=> false
isRelativeUrl('//sindresorhus.com');
//=> true
See is-absolute-url for the inverse.
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