Throwing error on given `view-source:` url string

[mebble]

const normalize = require('normalize-url');
const n = normalize('view-source:https://github.com/sindresorhus/normalize-url/blob/master/index.js')

throws the error:

Thrown:
TypeError [ERR_INVALID_URL]: Invalid URL: http:view-source:https://github.com/sindresorhus/normalize-url/blob/master/index.js
    at onParseError (internal/url.js:243:9)
    at new URL (internal/url.js:319:5)
    at normalizeUrl
    [....]
 {
  input: 'http:view-source:https://github.com/sindresorhus/normalize-url/blob/master/index.js',
  code: 'ERR_INVALID_URL'
}

Is this intentionally an error? Seems unintentional to me because it first prepends http to the input, turning it into 'http:view-source:https://... and then leaving it to the URL function to handle it, if I'm correct.

It would be awesome if we could have view-source urls handled by this module itself. Either define a normalisation result for view-source like how it's done for data urls, or return a clear error message.

[sindresorhus]

I agree the error could be better (PR welcome for that), but I'm not interested in supporting lots of random protocols.