import { type RequireExactlyOne, type Values } from '@augment-vir/common';
import { type AsyncProp, type DeclarativeElementDefinition } from 'element-vir';
/**
 * Base type for loaders passed to {@link createDynamicElementLoader}.
 *
 * @category Internal
 */
export type BaseDynamicElementLoaders = Record<string, () => Promise<DeclarativeElementDefinition>>;
/**
 * Create a dynamic element loader. This should go in your element state. This makes deferring
 * element importing convenient and allows parts of your app to be placed in separate bundles. Make
 * sure to also use {@link renderDynamicElement} to use the output of this loader.
 *
 * @category Util
 * @see {@link renderDynamicElement}
 * @see [example usage](https://github.com/electrovir/vira/blob/dev/packages/vira-book/src/element-book/entries/dynamic-elements.book.ts)
 */
export declare function createDynamicElementLoader<const Loaders extends Readonly<BaseDynamicElementLoaders>>(loaders: Readonly<Loaders>): DynamicElementAsyncProp<Loaders>;
/**
 * The value for the async prop {@link DynamicElementAsyncProp}.
 *
 * @category Internal
 */
export type DynamicElementValue<Loaders extends BaseDynamicElementLoaders> = {
    cache: Partial<Record<keyof Loaders, DeclarativeElementDefinition>>;
    element: Awaited<ReturnType<Values<Loaders>>>;
    key: keyof Loaders;
};
/**
 * An async prop for dynamic loading elements. This is the output from
 * {@link createDynamicElementLoader}.
 *
 * @category Internal
 */
export type DynamicElementAsyncProp<Loaders extends BaseDynamicElementLoaders> = AsyncProp<DynamicElementValue<Loaders>, keyof Loaders>;
/**
 * Params for the `ready` callback in {@link renderDynamicElement}.
 *
 * @category Internal
 */
export type ReadyParams<Loaders extends Readonly<BaseDynamicElementLoaders>> = RequireExactlyOne<{
    [Key in keyof Loaders]: Awaited<ReturnType<Loaders[Key]>>;
}>;
/**
 * Renders the current state of a dynamic element loader. This should go in your render function.
 * Make sure to also use {@link createDynamicElementLoader} to create a dynamic loader in your
 * element's state.
 *
 * @category Util
 * @see {@link createDynamicElementLoader}
 * @see [example usage](https://github.com/electrovir/vira/blob/dev/packages/vira-book/src/element-book/entries/dynamic-elements.book.ts)
 */
export declare function renderDynamicElement<const Loaders extends BaseDynamicElementLoaders, const LoadingReturnValue, const ReadyReturnValue, const ErrorReturnValue>(asyncProp: DynamicElementAsyncProp<Loaders>, { ready, loading, error, key, }: {
    /**
     * If this is left undefined (or falsy), the current key will not be set, whatever the
     * existing key is will continue to be used.
     */
    key?: keyof NoInfer<Loaders> | undefined;
    loading(this: void, params: Promise<ReadyParams<NoInfer<Loaders>>>): LoadingReturnValue;
    ready(this: void, params: ReadyParams<NoInfer<Loaders>>): ReadyReturnValue;
    error(this: void, error: Error): ErrorReturnValue;
}): ReadyReturnValue | LoadingReturnValue | ErrorReturnValue;