Function.instanceOf

umt / instanceOf

Function: instanceOf()

instanceOf<T>(classConstructor, message?): (value) => ValidateCoreReturnType<T> & StandardSchemaV1<T, T>

Defined in: Validate/instanceof/core.ts:26

Creates a validator that checks whether a value is an instance of the given constructor. Subclasses of the constructor satisfy the validator, matching native instanceof semantics.

Type Parameters

T

T

The instance type produced by the constructor

Parameters

classConstructor

Constructor<T>

Constructor whose instances are accepted

message?

string

Custom error message for validation failure

Returns

(value) => ValidateCoreReturnType<T> & StandardSchemaV1<T, T>

• Validator function for instances of the constructor