Playground link.

import { expectTypeOf } from 'expect-type';

let x!: any;
expectTypeOf(x).toBeBoolean();
expectTypeOf(x).toEqualTypeOf<boolean>();

The first expectTypeOf passes (which it should not) but the second errs (correctly). They should both err.

P.S. The same is true for other such helpers (like toBeArray, etc).