/**
 * Register an error handler for the current component.
 *
 * Called in the outer function. When the component's outer function or
 * template function throws during render, every registered handler
 * receives the error object. The handler does not return anything —
 * the component renders nothing in production or a dev error message
 * in development.
 *
 * @example
 * ```ts
 * const MyComponent: ComponentFn<{}> = () => {
 *   onError((error) => {
 *     reportToSentry(error);
 *   });
 *   return () => html`<div>${riskyStuff()}</div>`;
 * };
 * ```
 */
export declare const onError: (fn: (error: unknown) => void) => void;
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