dropbox-adapter.js

class Task extends EventEmitter {

    _innerResolve;

    constructor() {
        super();
    }

    get running() {
        return this._innerResolve !== undefined;
    }

    start() {
        Promise.race([
            this.run(),
            (new Promise((resolve, reject) => {
                this._innerResolve = resolve;
            }))
        ]);
    }

    stop() {
        if (this.running) {
            this._innerResolve();
        }
    }

    async run() {
        // No-op.
        return new Promise((reject, resolve) => {});
    }

}