/TypeScript/Verify if object is of a certain type type in typescript

Verify if object is of a certain type type in typescript

export interface SuccessResponse<T> extends ResponseEntity {
    data: T;
}

export interface FailureResponse<T> extends ResponseEntity {
    error: T;
}

// type-guard
export function isSuccessResponseTypeGuard<T>(data: ResponseEntity): data is SuccessResponse<T> {
    return (<SuccessResponse<T>>data).data !== undefined;
}

// use
if (!isSuccessResponseTypeGuard<IUser>(result)) {
  throw new UnauthorizedException(result.message);
}

Source: stackoverflow.com

Check type of object typescript

function isFish(pet: Fish | Bird): pet is Fish {
   return (<Fish>pet).swim !== undefined;
}

// Both calls to 'swim' and 'fly' are now okay.
if (isFish(pet)) {
  pet.swim();
}
else {
  pet.fly();
}

Source: stackoverflow.com

Similar codes

4 votes187 views2 answers
How to get value_counts output in dataframe format
TypeScript
-1 vote190 views1 answer
Components of api request
TypeScript
0 vote174 views1 answer
File attachements contac form 7
TypeScript
2 votes174 views2 answers
Flutter run code every second
TypeScript
12 votes212 views4 answers
Google fonts poppins
TypeScript
0 vote187 views1 answer
Cacerts default password
TypeScript
0 vote191 views1 answer
Type 'FormGroup' is missing the following properties from type 'NgForm': submitted, _directives, form, ngSubmit, and 18 more
TypeScript
0 vote179 views1 answer
Material ui tab link external
TypeScript
2 votes166 views1 answer
Typeorm findAndCount orderby
TypeScript
0 vote183 views1 answer
Html form display results same page
TypeScript