export interface HookEvent {
    hook_event_name: string;
    event_type?: string;
    provider: string;
    tool_name?: string;
    tool_input?: unknown;
    tool_output?: {
        text: string;
    } | null;
    success?: boolean;
    session_id?: string | null;
    message?: string | null;
    timestamp: string;
    [key: string]: unknown;
}
/** Canonical event_type for a hook_event_name (falls back to snake_case-ing the name). */
export declare function eventTypeFor(hookEventName: string): string;
export declare function normalizeEvent(provider: string, raw: Record<string, unknown>): HookEvent | null;
/**
 * Append a normalized event to a JSONL sink file.
 * Creates the directory if it doesn't exist.
 * Silently ignores write errors (non-critical path).
 */
export declare function appendHookEvent(jsonlPath: string, provider: string, raw: Record<string, unknown>, fs: {
    mkdirSync: (p: string, opts: {
        recursive: boolean;
    }) => void;
    appendFileSync: (p: string, d: string, opts: BufferEncoding | {
        encoding: BufferEncoding;
    }) => void;
}, path: {
    dirname: (p: string) => string;
}, onError?: (err: unknown) => void): void;
/**
 * Per-family normalizer. Concrete providers override `normalizeRaw` when they
 * speak a native event dialect (copilot-sdk, opencode-sdk, dummy). CLI-hook
 * families inherit the already-formatted pass-through.
 */
export declare abstract class ProviderNormalizer {
    abstract readonly provider: string;
    normalize(raw: Record<string, unknown>): HookEvent | null;
}