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This function uses the rulr.text guard to check the input is a valid text string (max 65,535 characters) as shown in the example below. It should only throw rulr.InvalidTextError.

import * as rulr from 'rulr'

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

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

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

// Valid
const example1: Example = constrainToExample({
	example: Array(65535).fill('a').join(''),
})

// Invalid: Too many characters
const example2: Example = constrainToExample({
	example: Array(65536).fill('a').join(''),
})

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