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

Shim for TC39 Weakrefs proposal

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function makeTaskQueue(register, letCallbackErrorsBubble = false) {
    const queue = new Array(1);
    function set(callback, ...args) {
        const queueId = queue.length;
        queue[queueId] = { callback, args };
        let error;
        try {
            if (!register(queueId))
                error = new Error("Failed to register task");
        }
        catch (err) {
            error = err;
        }
        if (error) {
            delete queue[queueId];
            throw error;
        }
        return queueId;
    }
    function clear(queueId) {
        delete queue[queueId];
    }
    function processBubble(queueId) {
        if (!(queueId in queue))
            return;
        const { callback, args } = queue[queueId];
        delete queue[queueId];
        callback(...args);
    }
    function processCatch(queueId) {
        if (!(queueId in queue))
            return;
        const { callback, args } = queue[queueId];
        delete queue[queueId];
        try {
            callback(...args);
        }
        catch (err) {
            setTimeout(() => {
                throw err;
            }, 0);
        }
    }
    return {
        set,
        clear,
        process: letCallbackErrorsBubble ? processBubble : processCatch,
    };
}
exports.default = makeTaskQueue;
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