tc39-weakrefs-shim/module/utils/tasks/setImmediate.shim.js

Shim for TC39 Weakrefs proposal

import makeTaskQueue from "./taskQueue.js";
export const available = typeof MessageChannel == "function";
export function shim() {
    if (!available)
        throw new Error("MessageChannel not available");
    function register(immediateId) {
        channel.port2.postMessage(immediateId);
        return true;
    }
    const { set, clear, process } = makeTaskQueue(register, true);
    const channel = new MessageChannel();
    channel.port1.addEventListener("message", (event) => process(event.data));
    channel.port1.start();
    return { setImmediate: set, clearImmediate: clear };
}
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