import type { LemmaClient } from "@lemmaoracle/spec";
export type Json = null | boolean | number | string | ReadonlyArray<Json> | Readonly<{
    [k: string]: Json;
}>;
export type Result<T> = Readonly<{
    ok: true;
    value: T;
}> | Readonly<{
    ok: false;
    error: Error;
}>;
export declare const ok: <T>(value: T) => Result<T>;
export declare const err: (error: Error) => Result<never>;
export declare const resolveFetch: (client: LemmaClient) => typeof fetch;
export declare const withApiKey: (client: LemmaClient, headers: Readonly<Record<string, string>>) => Readonly<Record<string, string>>;
export declare const toErrorMessage: (e: unknown) => string;
export declare const reject: <T = never>(message: string) => Promise<T>;
export declare const fetchHint: (client: LemmaClient) => string;
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