export interface VerifyPreWindowInputs {
    /** Every declared positive-fixture PR (duplicates fine; membership decides candidacy). */
    fixturePrs: readonly number[];
    /** The frozen split's train slice (members need no ancestry proof). */
    trainPrs: readonly number[];
    /** The frozen split's held-out slice (members are NEVER candidates — FM (c)). */
    heldOutPrs: readonly number[];
    /** PR → merge commit, from the full lc enumeration at the artifact's `asOfCommit`. */
    mergeCommitByPr: ReadonlyMap<number, string>;
    /** `true` iff the commit is an ancestor of the frozen split's `cutBoundarySha`. */
    isAncestorOfCutBoundary: (mergeCommit: string) => boolean;
}
/**
 * Derive the set of fixture PRs proven STRICTLY PRE-WINDOW: outside the window
 * (∉ train ∪ heldOut) with a resolvable merge commit that is an ancestor of the
 * cut boundary. Train/held-out members are never in the result (train needs no
 * proof; held-out must fail the gate as held-out, not ride an ancestry set).
 */
export declare function verifyPreWindowFixturePrs(inputs: VerifyPreWindowInputs): ReadonlySet<number>;
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