Hey and thanks for this lib - I started using it to day, coming from using plain .ts files with typed variable assignments & forced errors with // @ts-expect-error on top. It worked well, but I want to get to something more structured.
I see I also have to use // ts-expect-error to catch expected errors in ts-expect-error, which is fine.
I'm also in the habit of documenting the expected errors, like we do in out code tests, but it's purely for documentation & future reference, as it's not possible to be checked. For example:
const identity = <T>(val: T): T => val
// @ts-expect-error: TS2322: Type number is not assignable to type string
const str: string = identity(123)
In ts-expect we have the expectType<number>("test"); // Compiler error example, but we don't document the error somehow, so it can be checked.
An exotic new version could support something like:
expectTypeError<number>("test", `TS2345: Argument of type string is not assignable to parameter of type number`);
and perhaps do some magic to obtain error codes & descriptions.
I know this is much much harder, and probably not just a lib, as it perhaps would have to incorporate information from the IDE or TS compiler to do the trick, but there might be a way ;-) Maybe an IDE plugin? Who knows!
Anyway, just a thought, just sharing!
Hey and thanks for this lib - I started using it to day, coming from using plain .ts files with typed variable assignments & forced errors with
// @ts-expect-erroron top. It worked well, but I want to get to something more structured.I see I also have to use
// ts-expect-errorto catch expected errors ints-expect-error, which is fine.I'm also in the habit of documenting the expected errors, like we do in out code tests, but it's purely for documentation & future reference, as it's not possible to be checked. For example:
In
ts-expectwe have theexpectType<number>("test"); // Compiler errorexample, but we don't document the error somehow, so it can be checked.An exotic new version could support something like:
and perhaps do some magic to obtain error codes & descriptions.
I know this is much much harder, and probably not just a lib, as it perhaps would have to incorporate information from the IDE or TS compiler to do the trick, but there might be a way ;-) Maybe an IDE plugin? Who knows!
Anyway, just a thought, just sharing!