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Thanks to @krisdages for finding this! This commit removes the `string` condition on `IsNever` because `keyof never === keyof any === string`. Closes: #109
The tests for this were purely focused around the string form. This commit adds more complete tests to account for the wider range of applicability. This commit also simplifies the conditional of the original form.
The new `IsNever` only works with 3.5, so all older versions need to be dropped. This will bump the major version of `simplytyped` to avoid any breaking changes. I think it is worth it to drop older versions of the language to keep this package from rotting too severely, as long as we are careful with updating the major version whenever we change the supported TS versions. BREAKING CHANGE: no longer supporting typescript < 3.5
Retsam
reviewed
Jul 22, 2019
| export type FunctionPrototypeKeys = keyof Function; | ||
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| export type IsNever<S extends string> = Not<(Record<S, True> & Record<string, False>)[S]>; | ||
| export type IsNever<T> = keyof any extends keyof T ? Not<IsAny<T>> : False; |
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It's weird to me that keyof never is the same as keyof any, while keyof unknown is never. This feels like the sort of thing that might break in a later version of TS, but I suppose that's what the tests are for...
Retsam
approved these changes
Jul 22, 2019
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