/**
 * Minimal structural axios surface. No axios dependency — works across 0.31 and 1.x.
 */
export interface AxiosLikeInstance {
    defaults: {
        baseURL?: string;
    };
    interceptors: {
        request: {
            use(onFulfilled: (config: any) => any): unknown;
            eject?(id: unknown): void;
        };
        response: {
            use(onFulfilled: (response: any) => any, onRejected?: (error: any) => any): unknown;
            eject?(id: unknown): void;
        };
    };
}
/**
 * Wire an axios instance into the journey engine (observation-only).
 * Call once per instance (idempotent). Register any async request interceptors
 * (e.g. auth) before this call so this one runs first.
 * Soft-skips when `instance` is missing or not axios-like — hosts can pass axios as-is.
 * Returns a restore function that disposes handlers (they no-op after restore).
 */
export declare function instrumentAxios(instance: AxiosLikeInstance | null | undefined): () => void;
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