help wantedquestion
説明
I need feedback on the behaviour of the expectError assertion.
The expectType assertion is strict. Which means that expectType<string | number>(concat('a', 'b')) will fail because string | number is defined too wide. See the docs.
I didn't change anything for expectError as I wasn't sure on the exact behaviour.
@cartant asked if it would behave like this (see https://github.com/ReactiveX/rxjs/issues/4871#issuecomment-535725717).
expectError<string | number>(add(1, 2));
//=> no error
The reason behind it could be that because the type is too wide, the assertion is an error and that's what you expect.
I also discussed this with @sindresorhus and he indicated that maybe we should hard fail on that assertion.
I definitely could use feedback on this topic here :).
// @BendingBender