Typescript debounce function

debounce.ts

private _debounce(func, wait, immediate) {
    let timeout;
    return () => {
        const context = this;
        const later = () => {
            timeout = null;
            if (!immediate) func.apply(context);
        };

        const callNow = immediate && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);

        if (callNow) func.apply(context);
    };
};

const init = this._debounce(() => {
    var cropper = new Cropper.init();
}, 10, false);