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try catch error typescript

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Suman Majhi answered on May 3, 2022 Popularity 10/10 Helpfulness 7/10

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try catch error typescript

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// doc: https://devblogs.microsoft.com/typescript/announcing-typescript-4-0/#unknown-on-catch
try {  /* ... */ }
catch (e: unknown) { // <-- note `e` has explicit `unknown` type
    e.message // errors
    if (typeof e === "string") {
        e.toUpperCase() // works, `e` narrowed to string
    } else if (e instanceof Error) {
        e.message // works, `e` narrowed to Error
    }
    // ... handle other error types 
}


// Typescript 4.4 added the ability to make unknown the default on catch variables using the useUnknownInCatchVariables  flag.

Popularity 10/10 Helpfulness 7/10 Language typescript

Source: Grepper

Tags: try-catch typescript

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Contributed on May 03 2022

Suman Majhi

0 Answers Avg Quality 2/10

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typescript catch error type

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class MyError extends Error {
  constructor(message: string) {
    super(message);
    Object.setPrototypeOf(this, MyError.prototype)
  }
}

const myFunction = () => {
  throw new MyError('some reason');
}

try {
  myFunction();
} catch (error) {
  if (error instanceof MyError) {
    // Handle MyError....
  }
}

Popularity 10/10 Helpfulness 2/10 Language typescript

Source: www.ashsmith.io

Tags: typescript t

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Contributed on May 05 2022

What

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Handling errors in TypeScript

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type ErrorWithMessage = {
  message: string
}

function isErrorWithMessage(error: unknown): error is ErrorWithMessage {
  return (
    typeof error === 'object' &&
    error !== null &&
    'message' in error &&
    typeof (error as Record<string, unknown>).message === 'string'
  )
}

function toErrorWithMessage(maybeError: unknown): ErrorWithMessage {
  if (isErrorWithMessage(maybeError)) return maybeError

  try {
    return new Error(JSON.stringify(maybeError))
  } catch {
    // fallback in case there's an error stringifying the maybeError
    // like with circular references for example.
    return new Error(String(maybeError))
  }
}

function getErrorMessage(error: unknown) {
  return toErrorWithMessage(error).message
}

Popularity 8/10 Helpfulness 2/10 Language typescript

Source: kentcdodds.com

Tags: typescript t

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Contributed on Oct 24 2023

Arus

0 Answers Avg Quality 2/10

try catch error typescript

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