/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

12 votes177 views1 answer
Argument of type 'string | null' is not assignable to parameter of type 'string'. Type 'null' is not assignable to type 'string'
TypeScript
22 votes162 views3 answers
Typescript remove an item from array
TypeScript
0 vote177 views1 answer
Echarts is not defined
TypeScript
0 vote168 views2 answers
Ncbi datasets command-line tool
TypeScript
8 votes182 views6 answers
Cannot be loaded because running scripts is disabled on this system visual studio code
TypeScript
0 vote167 views1 answer
Google sheets importrange named range
TypeScript
2 votes188 views2 answers
Validate email with domain in angular6
TypeScript
1 vote177 views1 answer
List the constituents of the xylem. what would happen if the xylem of root of a plant is blocked?
TypeScript
0 vote146 views1 answer
Join elements in a list with , java
TypeScript
1 vote187 views1 answer
Whats ruby used for
TypeScript