Clousre in EventEmitter

    private handleSignals(
        proc: NodeJS.Process,
        signals: NodeJS.Signals[],
        errorToCallbacks: Map<EProcessError | EProcessSignals, Array<() => void>>,
    ): void {
        let currCloseCbs: Array<() => void> = [() => {}];
        for (const sig of signals) {
            currCloseCbs = errorToCallbacks.get(sig as EProcessSignals); //does this array of callbacks of this iteration<
            proc.on(sig, (): void => {
                ...
                currCloseCbs.map((cb) => cb()); //will be a closure while calling this
                ...
            });
        }
    }