lingo3d/lib/systems/utils/eventSimpleSystem.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

export default (cb, ticker) => {
    const queued = new Set();
    const execute = (payload) => {
        for (const target of queued)
            cb(target, payload);
    };
    let handle;
    const start = () => (handle = ticker(execute));
    return [
        (item) => {
            if (queued.has(item))
                return;
            queued.add(item);
            if (queued.size === 1)
                start();
        },
        (item) => {
            if (!queued.delete(item))
                return;
            queued.size === 0 && handle?.cancel();
        }
    ];
};
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