Sample implementation of a custom error

CustomError.ts

class CustomError extends Error {

    get name(): string { return 'CustomError'; };
    public stack: any;

    constructor(public code: number, public message: string) {
        super(message);
        if (typeof (<any>Error).captureStackTrace === 'function') {
            (<any>Error).captureStackTrace(this, this.constructor);
        } else {
            this.stack = (<any>(new Error())).stack;
        }
    }

    toString() {
        return this.name + '[' + this.code + ']: ' + this.message;
    }

}