/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

0 vote265 views1 answer
Angular jasmine tobe empty array
TypeScript
0 vote293 views1 answer
Return tru if one of the objects in a aray has a fild match
TypeScript
1 vote291 views1 answer
Microsoft.portable.csharp.targets was not found vs 2019
TypeScript
0 vote255 views1 answer
Linux host file location
TypeScript
1 vote282 views1 answer
Serenity.is change dialog width
TypeScript
0 vote263 views1 answer
How to execute more commands scripts package.json
TypeScript
5 votes262 views2 answers
Validation minlength angular
TypeScript
0 vote278 views1 answer
React-stripe-elements hidePostalCode
TypeScript
3 votes260 views1 answer
Github screenshots resize
TypeScript
2 votes254 views2 answers
Valid jwt
TypeScript