export type Result<T, E = AdapterError> = {
    readonly ok: true;
    readonly value: T;
} | {
    readonly ok: false;
    readonly error: E;
};
export declare const ok: <T>(value: T) => Result<T, never>;
export declare const err: <E>(error: E) => Result<never, E>;
export type AdapterErrorReason = 'verification-failed' | 'malformed-payload' | 'unsupported-event' | 'rate-limited' | 'upstream-unavailable' | 'unauthorized' | 'not-found' | 'internal';
export interface AdapterError {
    readonly reason: AdapterErrorReason;
    readonly message: string;
    readonly path?: string;
    readonly retryAfterSec?: number;
}
export declare function adapterError(reason: AdapterErrorReason, message: string, extra?: Pick<AdapterError, 'path' | 'retryAfterSec'>): AdapterError;
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