/**
 * The scorer (DES-DEFAULT-EVALS-001 §3, §6): cases in, figures out. Deterministic code only: no model, no clock, no
 * I/O. A case with no observation is `unscored` and is never counted as right or wrong.
 */
import type { DriftKey, EvalCase, SliceScore } from './types.js';
/** Did the system get this case right? `null` when it gave no answer. */
export declare function isCorrect(c: EvalCase): boolean | null;
export declare function isModelLabelled(c: EvalCase): boolean;
export declare function scoreSlice(cases: readonly EvalCase[]): SliceScore;
/** The four slices every suite reports (DES §4): real, synthetic, combined (both, no model labels), model. */
export declare function slices(cases: readonly EvalCase[]): {
    real: SliceScore;
    synthetic: SliceScore;
    combined: SliceScore;
    model: SliceScore;
};
/**
 * The normalization figure (S8): of the inputs observed in two or more places (projects, or surfaces), the share
 * judged the same everywhere. Computed from the same grouping as {@link driftKeys}.
 */
export declare function normalizationRate(cases: readonly EvalCase[], drift: readonly DriftKey[]): {
    compared: number;
    consistent: number;
};
/**
 * Normalization drift (DES §5): the same input judged differently by place. Cases are grouped by suite and
 * `inputKey`; a key whose observed answers differ across projects (or across surfaces, when the cases carry one)
 * is drift. A place where the answers already differ among themselves still counts once per distinct answer.
 */
export declare function driftKeys(cases: readonly EvalCase[]): DriftKey[];
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