/**
 * Opt-in chart-support installer.
 *
 * This file carries the static imports that wire the concrete chart
 * implementation (cache populator, chart builder, ChartEx builder,
 * preset engine, sidecar serialisers, `Chart` class and chart-api
 * helpers) into the excel host. Keep these imports isolated in a
 * separate module so callers who import only the types, the SVG/PNG
 * renderers, or the parser from `./index` do not trigger the entire
 * builder pipeline at bundle time.
 *
 * A single process-wide slot is populated:
 *
 * - The chart-support slot (`@excel/chart-host-registry`) — enables
 *   `worksheet.addChart()`, `worksheet.addLineChart()`, chart cache
 *   population during `workbook.xlsx.writeFile()`, and `Chart`
 *   reconstruction during XLSX load.
 *
 * The slot accepts `null` to uninstall. See
 * {@link uninstallChartSupport} for tests that need to exercise the
 * "no chart support" error path.
 */
/**
 * Install the chart runtime into the excel host.
 *
 * After calling this once, chart-manipulating APIs on `Worksheet`,
 * `Workbook` and `Chartsheet` run the full chart builder and renderer
 * pipeline instead of throwing. Subsequently-loaded workbooks also
 * reconstruct `Chart` instances for their existing charts so consumer
 * code can inspect / mutate them.
 *
 * Safe to call more than once — the registry accepts the last
 * registration. Calling is idempotent and cheap; no shared state is
 * mutated beyond the host-registry slot.
 */
export declare function installChartSupport(): void;
/**
 * Uninstall the chart runtime, restoring the cold-start state where
 * chart-manipulating APIs throw. Mainly useful for tests that exercise
 * the "no chart support" error path. In production, calling this is
 * rarely necessary — subsequent `installChartSupport()` calls simply
 * overwrite the previous registration.
 */
export declare function uninstallChartSupport(): void;