Retain Error Type with runPromise

I feel like I’m missing something really obvious here, so apologies if this is an incredibly dumb question.

I’m trying to introduce Effect into a legacy app, with a plan to slow the move the “edge” further out over time.

The boundary is a Promise-based function, so

runPromise

runPromise

seemed the obvious solution.

However, our error handlers depend on

instanceof

instanceof

and for the error thrown by

runPromise

runPromise

this is

FibreFailureImpl

FibreFailureImpl

rather than our actual error class.

Is there a simple way or retaining the error type without wrapping my pipeline inside a Promise and using

Effect.match

Effect.match

to call

resolve

resolve

reject

reject

.

i.e.

new Promise((resolve, reject) => pipe(
    …,
    Effect.match({
         onFailure: (error) => reject(error),
          onSuccess: () => resolve()
    }),
    Effect.runSync
))

new Promise((resolve, reject) => pipe(
    …,
    Effect.match({
         onFailure: (error) => reject(error),
          onSuccess: () => resolve()
    }),
    Effect.runSync
))

It just feels like I’ve missed something fundamental as it’s quite a lot of boilerplate.

Effect Community•2y ago

adtennant

Retain Error Type with runPromise

runPromise

runPromise

seemed the obvious solution.

However, our error handlers depend on

instanceof

instanceof

and for the error thrown by

runPromise

runPromise

this is

FibreFailureImpl

FibreFailureImpl

rather than our actual error class.

Is there a simple way or retaining the error type without wrapping my pipeline inside a Promise and using

Effect.match

Effect.match

to call

resolve

resolve

reject

reject

.

i.e.

new Promise((resolve, reject) => pipe(
    …,
    Effect.match({
         onFailure: (error) => reject(error),
          onSuccess: () => resolve()
    }),
    Effect.runSync
))

new Promise((resolve, reject) => pipe(
    …,
    Effect.match({
         onFailure: (error) => reject(error),
          onSuccess: () => resolve()
    }),
    Effect.runSync
))

It just feels like I’ve missed something fundamental as it’s quite a lot of boilerplate.

Retain Error Type with runPromise

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