61 replies

Creating a Helper Function to Catch and Remove Specific Errors in TypeScript

I'm trying to write a helper function that catches a specific error and remove it from the propagated error type.

For example

Effect<R, Error1 | Error2 | Error3, A>

Effect<R, Error1 | Error2 | Error3, A>

Effect<R, Error1 | Error2 | Error3, A>

Effect<R, Error1 | Error2 | Error3, A>, And then

pipe(
  ...,
  Effect.catchTag('Error2', () => ....)
)

pipe(
  ...,
  Effect.catchTag('Error2', () => ....)
)

pipe(
  ...,
  Effect.catchTag('Error2', () => ....)
)

pipe(
  ...,
  Effect.catchTag('Error2', () => ....)
)

Which should result in

Effect<R, Error1 | Error3, A>

Effect<R, Error1 | Error3, A>

Effect<R, Error1 | Error3, A>

Effect<R, Error1 | Error3, A>. Currently unable to specify the expected error type

Error2

Error2

Error2

Error2 without loosing the ability to exclude it from the output type. How do I go about that?