@haelp/teto/dist/utils/events.mjs

A typescript-based controllable TETR.IO client.

export class EventEmitter {
    #listeners;
    #maxListeners = 10;
    /** Enables more debugging logs for memory leaks */ verbose = false;
    constructor(){
        this.#listeners = [];
    }
    on(event, cb) {
        this.#listeners.push([
            event,
            cb,
            false
        ]);
        const listeners = this.#listeners.filter(([e])=>e === event);
        if (listeners.length > this.#maxListeners) {
            console.warn(`Max listeners exceeded for event "${String(event)}". Current: ${this.#listeners.filter(([e])=>e === event).length}, Max: ${this.#maxListeners}`);
            if (this.verbose) console.warn(`Trace: ${new Error().stack}\n\nListeners:\n`, listeners.map(([_, fn])=>fn.toString()).join("\n\n"));
        }
        return this;
    }
    off(event, cb) {
        this.#listeners = this.#listeners.filter(([e, c])=>e !== event || c !== cb);
        return this;
    }
    emit(event, data) {
        const toRemove = new Set();
        this.#listeners.forEach(([e, cb, once], idx)=>{
            if (e !== event) return;
            cb(data);
            if (once) toRemove.add(idx);
        });
        this.#listeners = this.#listeners.filter((_, idx)=>!toRemove.has(idx));
        return this;
    }
    once(event, cb) {
        this.#listeners.push([
            event,
            cb,
            true
        ]);
        return this;
    }
    removeAllListeners(event) {
        if (event) {
            this.#listeners = this.#listeners.filter(([e])=>e !== event);
        } else {
            this.#listeners = [];
        }
    }
    set maxListeners(n) {
        if (n <= 0 || !Number.isInteger(n)) {
            throw new RangeError("Max listeners must be a positive integer");
        }
        this.#maxListeners = n;
    }
    get maxListeners() {
        return this.#maxListeners;
    }
    export() {
        return {
            listeners: this.#listeners.map(([event, cb, once])=>({
                    event,
                    cb,
                    once
                })),
            maxListeners: this.#maxListeners,
            verbose: this.verbose
        };
    }
    import(data) {
        data.listeners.forEach(({ event, cb, once })=>{
            if (once) {
                this.once(event, cb);
            } else {
                this.on(event, cb);
            }
        });
        this.#maxListeners = data.maxListeners;
        this.verbose = data.verbose;
        return this;
    }
}

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