export declare class ChartGPUContext {
    /**
     * Get the shared GPUDevice — injected or singleton.
     * First call triggers async adapter/device negotiation if no device
     * has been injected.  Subsequent calls return synchronously via cache.
     */
    static getShared(): Promise<GPUDevice>;
    /**
     * Inject an external GPUDevice (e.g. from brainiac-engine).
     * Must be called before any chart renders.  Replaces the singleton
     * if one was already created.
     */
    static setDevice(device: GPUDevice): void;
    /**
     * Release the shared device and reset state.
     * Does NOT destroy an injected device (the caller owns its lifecycle).
     */
    static destroy(): void;
    /** Whether a device is available without triggering async creation. */
    static hasDevice(): boolean;
    private static _createDevice;
}