import type { TemplateResult } from 'lit';
import { type AsyncState } from './types';
/**
 * Wraps an async operation in an async generator that first yields
 * the `loadingContent` and then the result of the operation.
 */
export declare function loading<T>(asyncOperation: AsyncState<T>, loadingContent?: TemplateResult | string): AsyncIterable<T | TemplateResult | string>;
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