export type RequestUploadEvidence = {
    readonly state: 'observed';
    readonly bodyWrite: 'observed' | 'not-observed';
    readonly bodyWriteCompleteMs?: number;
    readonly nativeResponseHeadersMs?: number;
    readonly alpn: 'h2' | 'http/1.1' | 'unavailable';
    readonly nodeWritableBufferBytes?: number;
} | {
    readonly state: 'unavailable';
} | {
    readonly state: 'work-limit';
} | {
    readonly state: 'ambiguous';
    readonly requestCount: number;
};
/** Observe public native events only; never read request fields, mutate transport or imply remote receipt. */
export declare function createRequestUploadObserver(): {
    run<T>(operation: () => T): T;
    snapshot(): RequestUploadEvidence;
    close(): void;
};
export declare function formatRequestUploadEvidence(evidence: RequestUploadEvidence | undefined): string;
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