“Versuchen Sie, Fehlertypscript zu fangen” Code-Antworten

Versuchen Sie, Fehlertypscript zu fangen

// 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.

Suman Majhi

Typscript Catch -Fehlertyp

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....
  }
}

What

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