/**
 * `receipt.json` — the record `aidlc verify` writes after running the test command.
 *
 * It holds hashes and metadata only. Test output can print tokens and the receipt is
 * committed, so the output itself is never stored (tool-written-test-receipts/AC-7).
 * A read that finds any field of the wrong type is `unreadable`, never a pass (AC-16).
 *
 * Requirements: tool-written-test-receipts/AC-5, AC-7, AC-16
 */
export declare const RECEIPT_FILE = "receipt.json";
export interface Receipt {
    version: 1;
    /** HEAD when the run started. */
    commit: string;
    /** Whether any path outside the instance's state directory had changed (AC-6). */
    dirty: boolean;
    command_sha256: string;
    /** A signal is recorded as 128 + its number (AC-10). */
    exit_code: number;
    /** sha256 of stdout and stderr bytes in arrival order. */
    output_sha256: string;
    duration_ms: number;
    cli_version: string;
    /** ISO 8601 UTC. */
    finished_at: string;
}
export type ReadReceiptResult = {
    ok: true;
    receipt: Receipt;
} | {
    ok: false;
    reason: 'missing' | 'unreadable';
};
export declare function sha256(data: string | Buffer): string;
export declare function hashCommand(command: string): string;
export declare function receiptPath(projectRoot: string, instance: string): string;
export declare function readReceipt(projectRoot: string, instance: string): ReadReceiptResult;
export declare function writeReceipt(projectRoot: string, instance: string, receipt: Receipt): string;
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