Problem with optional properties

[mvcbox]

Hello!
I noticed some peculiarity when working with optional properties.
For example:

interface SomeInterface {
    someOptionalProperty?: string;
}

const value: SomeInterface = { someOptionalProperty: undefined };

This code is quite valid and can be compiled without any problems.

Example with assertType:
For example:

interface SomeInterface {
    someOptionalProperty?: string;
}

const value: SomeInterface = assertType<SomeInterface>({ someOptionalProperty: undefined });

In this case, I will get the error:

TypeGuardError: validation failed at $.someOptionalProperty: expected a string

[mvcbox]

@woutervh- Can you check it please?

[woutervh-]

hi @mvcbox

This is by design. Please see #25 for more info ;)

[mvcbox]

@woutervh- , okay(
Thank for answer