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This function uses the rulr.isURL guard to check the input is a valid URL as shown in the example below. It should only throw rulr.InvalidURLError. This function uses the much loved validator package.

import * as rulr from 'rulr'

const constrainToExample = rulr.object({
	required: {
		example: rulr.url,
	},
})

type Example = rulr.Static<typeof constrainToExample>
// {
//   example: rulr.URL
// }

// Valid
const example1: Example = constrainToExample({
	example: '[email protected]',
})

// Invalid: Not a valid URL
const example2: Example = constrainToExample({
	example: 'testexample.org',
})

// Invalid: Not a string
const example3: Example = constrainToExample({
	example: 1,
})