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

• TSchema extends BaseSchema<unknown, unknown, BaseIssue<unknown>>

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
}

Related

The following APIs can be combined with is.

Schemas

• any,
• array,
• bigint,
• blob,
• boolean,
• custom,
• date,
• enum,
• file,
• function,
• instance,
• intersect,
• lazy,
• literal,
• looseObject,
• looseTuple,
• map,
• nan,
• never,
• nonNullable,
• nonNullish,
• nonOptional,
• null,
• nullable,
• nullish,
• number,
• object,
• objectWithRest,
• optional,
• picklist,
• promise,
• record,
• set,
• strictObject,
• strictTuple,
• string,
• symbol,
• tuple,
• tupleWithRest,
• undefined,
• union,
• unknown,
• variant,
• void

Methods

• config,
• fallback,
• keyof,
• omit,
• partial,
• pick,
• pipe,
• required,
• unwrap