svelte-codemirror-editor

/**
 * Reduce calls to the passed function.
 *
 * @param func - Function to debounce.
 * @param threshold - The delay to avoid recalling the function.
 * @param execAsap - If true, the Function is called at the start of the threshold, otherwise the Function is called at the end of the threshold.
 */
export function debounce<T extends (...args: any[]) => any>(func: T, threshold: number, execAsap = false): T {
  let timeout: any;

  return function debounced(...args: any[]): any {
    const self = this;

    if (timeout) clearTimeout(timeout);
    else if (execAsap) func.apply(self, args);

    timeout = setTimeout(delayed, threshold || 100);

    function delayed(): void {
      if (!execAsap) func.apply(self, args);
      timeout = null;
    }
  } as T;
}