Maybe

Maybe

Validates if value is nil or matches expectation.

Returns: true if value is an undefined|null(nil) or matches expectation, else throws.

import { expect } from 'chai';

import { maybe, Maybe, PropTypes, ValidationError, validate } from 'typend';

validate(undefined, PropTypes.maybe(String));

validate(null, PropTypes.maybe(String));

validate('foo', PropTypes.maybe(String));

validate('foo', new Maybe(String));

expect(() => validate('foo', maybe('baz'))).to.throw(ValidationError);