Function warnDev

packages/core/src/runtime/instances.ts:23–27

(message: string)

const DEV_MODE = NODE_ENV !== "production";

function warnDev(message: string): void {
  if (!DEV_MODE) return;
  const c = (globalThis as { console?: { warn?: (msg: string) => void } }).console;
  c?.warn?.(message);
}

/** Effect cleanup function returned by effect callbacks. */
export type EffectCleanup = () => void;