coded-error.js

export class CodedError extends Error {
    constructor(code, msg) {
        super(msg)
        this.code = code;
        this.msg = msg;
    }
    static is(code) {
        return (e) => e.code == code;
    }
    static only(code, handler) {
        return err => {
            if (err.code === code) return handler(err)
            throw err;
        }
    }
}