import { FunctionHandler, InvocationContext } from '@azure/functions';
export type ExceptionalResult = {
    $failed: true;
    $error: Error;
};
export type MiddlewareResult<T> = ExceptionalResult | {
    $failed: false;
    $result: Awaited<T | undefined>;
};
export type BeforeExecutionFunction<T = FunctionHandler> = T extends (...a: infer U) => infer R ? (...a: [...U, MiddlewareResult<R>]) => unknown : never;
export type PostExecutionFunction<T = FunctionHandler> = BeforeExecutionFunction<T>;
export declare const isErrorResult: <T>(result: MiddlewareResult<T> | ExceptionalResult) => result is ExceptionalResult;
export type Options = {
    errorResponseHandler?: (error: unknown, context: InvocationContext) => {
        [key: string]: unknown;
    };
    disableErrorHandling?: boolean;
};
export declare const middleware: <T extends FunctionHandler>(beforeExecution: (BeforeExecutionFunction<T> | false)[], handler: T, postExecution: (PostExecutionFunction<T> | false)[], opts?: Options) => (request: Parameters<T>[0], context: InvocationContext) => ReturnType<T>;