import type { ChartDatapoint } from '../../../core/types/chart-data.js';
import { type FlameIndex } from '../utils/build-flame-index.js';
type UseFlameDataArgs<TData extends ChartDatapoint> = {
    data: readonly TData[];
    idAccessor: string;
    parentIdAccessor: string;
    /**
     * Currently isolated span id, or `undefined` when the full dataset is displayed.
     */
    isolatedId: unknown;
    /**
     * Gates the isolation branch. When `false`, `isolatedRoot` is always `null`
     * and `effectiveData` returns the full indexed dataset, letting the same
     * hook power both the isolate-enabled and isolate-disabled configurations
     * of a flame component.
     */
    isolationEnabled: boolean;
};
type UseFlameDataResult<TData extends ChartDatapoint> = FlameIndex<TData> & {
    /**
     * The indexed datum matching `isolatedId`, or `null` when isolation is off or the id is not found.
     */
    isolatedRoot: TData | null;
    /**
     * `[isolatedRoot, ...descendants]` when isolated; the full indexed dataset otherwise.
     */
    effectiveData: TData[];
    /**
     * Id of the sole root of the currently visible chart, or `undefined` when no
     * such unambiguous root exists (multiple orphan roots visible). Equals
     * `isolatedId` when isolated; otherwise the id of the single raw-data root
     * if there is exactly one. Consumers use this to gate no-op actions — e.g.
     * disabling "isolate" on a span that already occupies the entire chart.
     */
    visibleRootId: unknown;
};
/**
 * Shared data hook for FlameChart / FlameGraph. Wraps `buildFlameIndex`
 * (single `O(n)` pass over raw data) and `collectSubtree` (walk from the
 * isolation root) in memos keyed on the inputs that actually matter, so
 * the expensive index build only reruns when `data` or the id accessors
 * change — never on a re-render triggered by isolation navigation alone.
 * @internal
 */
export declare function useFlameData<TData extends ChartDatapoint>({ data, idAccessor, parentIdAccessor, isolatedId, isolationEnabled, }: UseFlameDataArgs<TData>): UseFlameDataResult<TData>;
export {};
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