/**
 * Types for Composition and Middleware
 */
/**
 * Middleware type - transforms a function by wrapping it
 */
export type Middleware<TInput = any, TOutput = any> = (next: (input: TInput) => Promise<TOutput>) => (input: TInput) => Promise<TOutput>;
/**
 * Configuration for compose function
 */
export interface ComposeConfig<_TInput = void, TOutput = unknown> {
    /**
     * Called before execution starts
     */
    onStart?: () => void | Promise<void>;
    /**
     * Called after successful completion
     */
    onComplete?: (result: TOutput, duration: number) => void | Promise<void>;
    /**
     * Called on error
     */
    onError?: (error: Error) => void | Promise<void>;
}
/**
 * Options for timeout middleware
 */
export interface TimeoutMiddlewareOptions {
    /**
     * Timeout duration in milliseconds
     */
    duration: number;
    /**
     * Custom error message
     */
    message?: string;
}
/**
 * Options for fallback middleware
 */
export interface FallbackMiddlewareOptions<TInput = any, TOutput = any> {
    /**
     * Fallback function(s) to execute if primary fails
     */
    fallback: ((input: TInput) => TOutput | Promise<TOutput>) | Array<(input: TInput) => TOutput | Promise<TOutput>>;
    /**
     * Predicate to determine if fallback should be used
     * @default () => true
     */
    shouldFallback?: (error: Error) => boolean;
}
/**
 * Options for cache middleware
 */
export interface CacheMiddlewareOptions<TInput = any, _TOutput = any> {
    /**
     * Time-to-live in milliseconds
     */
    ttl?: number;
    /**
     * Custom key generation function
     * @default JSON.stringify
     */
    keyFn?: (input: TInput) => string;
}
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