/**
 * Per-variant Msg coverage tracker — dev-only.
 *
 * Records each dispatched message's discriminant (or `<non-discriminant>`
 * for objects missing a `type` field) along with the message index it
 * fired at. Consumed by the `llui_coverage` MCP tool to surface untested
 * Msg variants: any variant declared in the compiled `__msgSchema` that
 * never fired in the current session shows up in `neverFired`.
 *
 * Zero cost in production: `installSignalDebug` is the only caller, and it
 * never runs in prod builds. Hot path is one optional-chain read per
 * dispatched message (`ci._coverage?.record(...)`).
 */
export interface CoverageSnapshot {
    fired: Record<string, {
        count: number;
        lastIndex: number;
    }>;
    neverFired: string[];
}
export interface CoverageTracker {
    record(variant: string, messageIndex: number): void;
    snapshot(knownVariants?: string[]): CoverageSnapshot;
    clear(): void;
}
export declare function createCoverageTracker(): CoverageTracker;
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