InstanceOf

InstanceOf

Validates if value is instance of an expected type.

Returns: true if value has same type as expectation, else throws.

import { expect } from 'chai';

import { check, iof, UnmatchedTypeError, string, number, PropTypes } from 'typend';

check<string>('foo');

check<number>(1337);

expect(() => check<number>('foo')).to.throw(UnmatchedTypeError);

validate('foo', String);

validate(1337, PropTypes.instanceOf(Number));

validate('foo', string);

validate(1337, number);