@squid-dev/cc-web-term/dist/computer.js

A ComputerCraft terminal for the internet

export class Semaphore {
    constructor() {
        this.listeners = new Set();
    }
    attach(listener) {
        this.listeners.add(listener);
    }
    detach(listener) {
        this.listeners.delete(listener);
    }
    signal() {
        for (const listener of this.listeners)
            listener();
    }
}