export interface LazyClient<T> {
    (): Promise<T>;
    /** Test seam: inject a client so the dynamic SDK import is never made. */
    set(client: T): void;
}
/**
 * Memoise a lazily-built SDK client.
 *
 * Every adapter resolves its SDK through a dynamic import so the dependency
 * stays optional and is only paid for once the provider is actually used.
 * The in-flight promise is cached too, so two concurrent first calls share one
 * client instead of racing to construct two.
 */
export declare function lazyClient<T>(build: () => Promise<T>): LazyClient<T>;
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