/**
 * Change detection for cell values.
 *
 * Sits on the hottest path in the grid: at thousands of updates per second it
 * runs once per candidate cell per frame. Every branch is therefore ordered by
 * how often it is taken — the overwhelming majority of comparisons are two
 * primitives — and no branch allocates.
 *
 * @packageDocumentation
 */
/**
 * Returns `true` when two cell values are visually identical and no DOM write
 * is needed.
 *
 * Semantics, in order of frequency:
 * - **Primitives** — strict equality, with `NaN === NaN` treated as unchanged
 *   (`Object.is`) so a numeric column holding `NaN` does not repaint forever.
 * - **`null` / `undefined`** — treated as equal to each other: both render as
 *   an empty cell, so swapping one for the other is not a visible change.
 * - **`Date`** — compared by timestamp, not identity; a re-parsed date with the
 *   same instant must not count as a change.
 * - **Arrays** — compared shallowly by length and element identity. Array cells
 *   (tag/badge columns) are small by construction, and a deep walk would cost
 *   more than the repaint it avoids.
 * - **Other objects** — compared by reference. Immutable updates therefore
 *   diff correctly; in-place mutation of a nested object is a deliberate
 *   non-signal, matching how the row pipeline treats `row.data` identity.
 *
 * @param a - Previously rendered value.
 * @param b - Current value from the row data.
 * @returns `true` when the DOM already shows `b`.
 */
export declare function isSameCellValue(a: unknown, b: unknown): boolean;
/**
 * Snapshots a value so a later {@link isSameCellValue} comparison stays correct
 * even if the caller mutates the original in place.
 *
 * Only arrays are copied — and only their top level, matching the comparison
 * depth. Everything else is stored as-is: primitives are immutable, and object
 * cells are compared by reference by design.
 *
 * @param value - Value about to be recorded in the virtual tree.
 * @returns A value safe to retain until the next diff.
 */
export declare function snapshotCellValue(value: unknown): unknown;
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