/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 vote189 views1 answer
Res.write prints html tags as text in express
TypeScript
32 votes205 views6 answers
Bootstrap alerts
TypeScript
0 vote197 views1 answer
What are the common mistakes in testing
TypeScript
0 vote186 views1 answer
Ubuntu hosts file location
TypeScript
0 vote201 views2 answers
Iframe redirects to another page
TypeScript
0 vote193 views1 answer
Typeorm data array from relation
TypeScript
35 votes183 views4 answers
Because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
TypeScript
0 vote183 views1 answer
Wordpress query to get posts by post meta
TypeScript
0 vote189 views1 answer
Targe id that starts with
TypeScript
1 vote188 views1 answer
Rename table of contents latex
TypeScript