export type RPCContext = {
    headers: Record<string, string>;
    req?: any;
    env?: any;
    ws?: any;
    waitUntil?: (p: Promise<any>) => void;
};
export type MaybePromise<T> = T | Promise<T>;
export type ProcedureType = 'query' | 'mutation';
export type Merge<A, B> = Omit<A, keyof B> & B;
export type MiddlewareFn<Context, I = unknown, AddContext = object> = (options: {
    context: Context;
    input: I;
    next: (context: Merge<Context, AddContext>) => Promise<any>;
}) => MaybePromise<any>;
export type Procedure<Context, I, O> = {
    type: ProcedureType;
    meta?: any;
    resolve: (options: {
        context: Context;
        input: I;
    }) => Promise<O>;
};