Effect CommunityEC
Effect Community•3y ago•
7 replies
tomchristensen

Handling only some errors in an Async API

What's the best way to deal with an async API where I want to catch some errors and ignore others (i.e. let the program die)?

So far I've been using the pattern below, however 1) it feels a bit verbose and unnecessary to create wrappers for the "irrelevant" errors, and 2) it doesn't cause the program to just die when an IrrelevantError occurs.

Effect.tryPromise({
  try: () => someThirdPartyFn(),
  catch: (e) => {
    if (weCareAbout(e)) {
      return new RelevantError(e)
    } else {
      return new IrrelevantError(e)
    }
  }
})


I considered just using Effect.promise to run the promise, then Effect.catchSomeDefect to recover from the errors I care about, however that seems like an anti-pattern (and catchSomeDefect comes with a strong health warning as well).
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