is

Checks if the input matches the scheme.

By using a type predicate, this function can be used as a type guard.

const result = v.is<TSchema>(schema, input);

Generics

Parameters

  • schema TSchema
  • input unknown

Returns

  • result boolean

Example

The following example show how is can be used.

const EmailSchema = v.pipe(v.string(), v.email());
const data: unknown = 'jane@example.com';

if (v.is(EmailSchema, data)) {
  const email = data; // string
}

The following APIs can be combined with is.

Schemas

Methods

Contributors

Thanks to all the contributors who helped make this page better!

  • GitHub profile picture of @fabian-hiller

Partners

Thanks to our partners who support the project ideally and financially.

Sponsors

Thanks to our GitHub sponsors who support the project financially.

  • GitHub profile picture of @antfu
  • GitHub profile picture of @Thanaen
  • GitHub profile picture of @osdiab
  • GitHub profile picture of @ruiaraujo012
  • GitHub profile picture of @hyunbinseo
  • GitHub profile picture of @F0rce
  • GitHub profile picture of @UniquePixels
  • GitHub profile picture of @jdgamble555
  • GitHub profile picture of @nickytonline
  • GitHub profile picture of @KubaJastrz
  • GitHub profile picture of @andrewmd5
  • GitHub profile picture of @caegdeveloper
  • GitHub profile picture of @dslatkin
  • GitHub profile picture of @BrianCurliss