Extendable custom errors for Typescript.

error.ts

 class CustomError extends Error {
     public name = this.constructor.name;
     constructor(message?: string, opts?: { name?: string }) {
         super(message); // 'Error' breaks prototype chain here
         Object.setPrototypeOf(this, new.target.prototype); // restore prototype chain
     }
 }
 
 // tslint:disable-next-line: max-classes-per-file
 class SuperBadError extends CustomError {
     constructor(message?: string) {
         super(message);
     }
 }
 
 // tslint:disable-next-line: max-classes-per-file
 class EvenWorseError extends SuperBadError {
     constructor(message?: string) {
         super(message);
     }
 }
 
 throw new EvenWorseError('Uhh ohh'); // => throws: EvenWorseError: Uhh ohh