@tanstack/db/dist/esm/strategies/throttleStrategy.js

A reactive client store for building super fast apps on sync

function throttleStrategy(options) {
  const leading = options.leading === true || options.leading === void 0 && options.trailing !== true;
  const trailing = options.trailing !== false;
  let nextAllowedAt = Number.NEGATIVE_INFINITY;
  let trailingTimeout;
  let pendingCallback;
  return {
    _type: `throttle`,
    options,
    execute: (fn) => {
      const now = Date.now();
      if (leading && trailingTimeout === void 0 && now >= nextAllowedAt) {
        nextAllowedAt = now + options.wait;
        fn();
        return;
      }
      if (!trailing) return false;
      pendingCallback = fn;
      if (trailingTimeout === void 0) {
        const delay = leading ? Math.max(0, nextAllowedAt - now) : options.wait;
        trailingTimeout = setTimeout(() => {
          trailingTimeout = void 0;
          nextAllowedAt = Date.now() + options.wait;
          const callback = pendingCallback;
          pendingCallback = void 0;
          callback?.();
        }, delay);
      }
      return;
    },
    cleanup: () => {
    }
  };
}
export {
  throttleStrategy
};
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