type ActivationFailureHandler = (error: unknown) => void;
/**
 * Run an async callback at most once, falling back when context activation fails.
 *
 * Context providers are synchronous callback invokers by contract. Once the
 * application callback has been invoked, its promise is authoritative: a
 * provider-owned replacement (including a promise that never settles) must not
 * delay or replace application work.
 */
export declare function runAsyncWithContextFallback<T>(activate: (callback: () => Promise<T>) => Promise<T>, callback: () => Promise<T>, onActivationFailure?: ActivationFailureHandler): Promise<T>;
/** Run a sync callback at most once, falling back when context activation fails. */
export declare function runSyncWithContextFallback<T>(activate: (callback: () => T) => T, callback: () => T, onActivationFailure?: ActivationFailureHandler): T;
export {};
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