tc39-weakrefs-shim/module/internal/WeakRefJobs.js

Shim for TC39 Weakrefs proposal

export function createWeakRefJobs(scheduleClearKeptObjects, hooks = {}) {
    const keptAliveDuringJob = new Set();
    return {
        keepDuringJob(object) {
            if (keptAliveDuringJob.has(object))
                return;
            keptAliveDuringJob.add(object);
            if (hooks.holdObject)
                hooks.holdObject(object);
            if (keptAliveDuringJob.size == 1)
                scheduleClearKeptObjects();
        },
        clearKeptObjects() {
            for (const object of keptAliveDuringJob) {
                // One by one to stay consistent with releaseObject
                keptAliveDuringJob.delete(object);
                if (hooks.releaseObject)
                    hooks.releaseObject(object);
            }
        },
        get isKeepingObjects() {
            return keptAliveDuringJob.size > 0;
        },
    };
}
export function createWeakRefJobsForTaskQueue(setTask, hooks = {}) {
    const jobs = createWeakRefJobs(() => setTask(jobs.clearKeptObjects), hooks);
    return jobs;
}
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