Try

Go-style Result values for async code: tryCatch runs a function and hands back a success or failure branch instead of throwing. The point is the type system — a Result cannot be read without acknowledging the error branch, whereas a try/catch binding is unknown and easy to ignore. Use it where failure is an expected outcome, and keep throwing for genuinely exceptional states that no caller can sensibly handle.

Example

import { tryCatch } from '@rtorcato/js-common/try'

const result = await tryCatch(() => fetch('/api/user').then((r) => r.json() as Promise<User>))

if (result.error) {
  console.warn('user lookup failed', result.error)
  return null
}

result.data.email // narrowed to User — unreachable without handling `error` first

Note the name collision: tryCatch here is the Result helper. The errors module's similarly-shaped helper is tryWithFallback, which returns a fallback value instead.

Import

import { Failure, Result, Success } from '@rtorcato/js-common/try'

Exports

Name	Summary
`Failure`	Error branch of a `Result` — carries a `null` value and an error of type `E`.
`Result`	Go-style discriminated union representing either a `Success<T>` or a `Failure<E>`, for async code that prefers explicit error returns over thrown exceptions.
`Success`	Successful branch of a `Result` — carries the value and a `null` error.
`isSuccess`	Type guard that narrows a `Result` to its `Success` branch when the error is `null`.
`tryCatch`	Run an async function and capture any thrown error into a `Result`, eliminating try/catch at the call site.

Example​

Import​

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See also​

Example

Import

Exports

See also