Interface UpdateHandler<A, R>

interface UpdateHandler<A, R> {
handle: (arg: A) => R | Promise<R>;
validate?: (arg: A) => string | boolean | void;
}

Properties

handle: (arg: A) => R | Promise<R>

Runs once per accepted update; may run steps.

validate?: (arg: A) => string | boolean | void

Runs first; throw (or return a string) to refuse. A refusal records nothing.