Add string.boolean.parse keyword

[aelesia]

Request a feature

Add string.boolean.parse to support parsing boolean strings

🤷 Motivation

string.integer.parse and string.numeric.parse exist, but there's no equivalent for booleans. Parsing "true"/"false" strings from environment variables, query params, and serialized data is a common use case.

💡 Solution

Add string.boolean and string.boolean.parse following the exact same pattern as stringInteger/stringNumeric in string.ts. Validate that the string is "true" | "false", then morph it into a boolean

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Happy to open a PR for this.

[pullfrog]

  ^{｜ Build this ➔ ｜ Make a plan ➔}

[Bas950]

Yea I just use

const Booleanize = type('0|1|boolean|null|undefined|"true"|"false"').pipe(Boolean)

would be nice if it was supported by default though.

[aelesia]

I have a similar export, but the main draw of using Arktype for me is that the entire schema can be written in plain JSON and transported/stored without requiring any dependencies or code. I would prefer to be able to express this as a regular string instead of using an import.