Spitball implementation of fluid.effect which delays notification until all referenced signals have moved away from undefined

fluid-signals.js

fluid.effect = function (func, ...args) {
    return effect( () => {
        let undefinedSignals = false;
        const designalArgs = [];
        for (const arg of args) {
            if (arg instanceof preactSignalsCore.Signal) {
                const value = arg.value;
                designalArgs.push(arg.value);
                if (value === undefined) {
                    undefinedSignals = true;
                }
            } else {
                designalArgs.push(arg);
            }
        }
        // const designalArgs = args.map(arg => arg instanceof preactSignalsCore.Signal ? arg.value : arg);
        if (!undefinedSignals) {
            return typeof(func) === "string" ? fluid.invokeGlobalFunction(func, designalArgs) : func.apply(null, designalArgs);
        }
    });
};