export interface PrInfo {
    number: number;
    state: 'OPEN' | 'MERGED' | 'CLOSED';
    headSha: string;
    mergedAt: string | null;
    additions: number;
    deletions: number;
    title: string;
    body: string;
}
export interface GhClient {
    viewPr(pr: number): PrInfo;
    /** Squash-merge. When expectedHead is given, gh refuses unless the PR head still
     *  matches it — so a push during the gate can never land an untested revision. */
    squashMerge(pr: number, expectedHead?: string): void;
    /** OID of the merge commit for a MERGED PR; null while GitHub has not yet
     *  reported one (D9: bootstrap_merged records it). */
    mergeCommitSha(pr: number): string | null;
    comment(pr: number, body: string): void;
    listLabeled(label: string): number[];
    /** D13: changed-file paths of the PR (`gh pr diff --name-only`). */
    changedFiles(pr: number): string[];
    postMergeRed(defaultBranch: string): boolean;
}
export declare function createGhClient(cwd: string): GhClient;
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