@dhmk/atom/esm/runtime.js

Lightweight mobx-like observable values, computed values and side-effects

export var runtime = {
    currentAtom: undefined,
    counter: 0,
    requireAction: true,
    effects: new Set(),
    addEffect: function (x) {
        runtime.effects.add(x);
    },
    runEffects: function () {
        if (runtime.counter > 0)
            return;
        runtime.counter++;
        var errors = Array();
        runtime.effects.forEach(function (x) {
            runtime.effects.delete(x);
            try {
                x.actualize();
            }
            catch (e) {
                errors.push(e);
            }
        });
        runtime.counter--;
        if (errors.length)
            throw errors.length === 1 ? errors[0] : new AggregateError(errors);
    },
    act: function (fn) {
        var prevAtom = runtime.currentAtom;
        runtime.currentAtom = undefined;
        runtime.counter++;
        try {
            return fn();
        }
        finally {
            runtime.counter--;
            runtime.currentAtom = prevAtom;
            runtime.runEffects();
        }
    },
};