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mimeType

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This function uses the rulr.isMimeType guard to check the input is a valid MIME type as shown in the example below. It should only throw rulr.InvalidMimeTypeError. This function uses the much loved validator package.

import * as rulr from 'rulr'

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

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

// Valid
const example1: Example = constrainToExample({
	example: 'application/json',
})

// Invalid: Not a valid MIME type
const example2: Example = constrainToExample({
	example: 'applications/json',
})

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