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

Shim for TC39 Weakrefs proposal

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const taskQueue_js_1 = __importDefault(require("./taskQueue.js"));
exports.available = typeof MessageChannel == "function";
function shim() {
    if (!exports.available)
        throw new Error("MessageChannel not available");
    function register(immediateId) {
        channel.port2.postMessage(immediateId);
        return true;
    }
    const { set, clear, process } = taskQueue_js_1.default(register, true);
    const channel = new MessageChannel();
    channel.port1.addEventListener("message", (event) => process(event.data));
    channel.port1.start();
    return { setImmediate: set, clearImmediate: clear };
}
exports.shim = shim;
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