/**
 * Create a GPU device + adapter you own, to pass to `createShader` via the `gpu`
 * option.
 *
 * **You almost certainly don't need this.** Device sharing is automatic: every
 * shader on a page already adopts one lazily-created device, so pipelines compile
 * once for the page and survive component unmounts (which is what keeps SPA route
 * changes fast). Calling this changes *who owns* the device, not whether sharing
 * happens.
 *
 * Reach for it only when you need explicit control — interoperating with another
 * WebGPU renderer that must share the same device, requesting a specific
 * `powerPreference`, or managing the device's lifetime yourself.
 *
 * Returns `null` if WebGPU is unavailable on this device — in that case
 * callers should pass no `gpu` option and let each shader fall back to its
 * own WebGL renderer.
 *
 * @example
 * ```js
 * import { createShader, createSharedDevice } from 'shaders/js'
 *
 * const gpu = await createSharedDevice()
 *
 * const a = await createShader(canvasA, presetA, { gpu })
 * const b = await createShader(canvasB, presetB, { gpu })
 * const c = await createShader(canvasC, presetC, { gpu })
 * // ...all three share the same WebGPU device
 * ```
 */
export declare function createSharedDevice(options?: {
    /** Power preference for the requested adapter. Default `'high-performance'`. */
    powerPreference?: GPUPowerPreference;
}): Promise<{
    device: GPUDevice;
    adapter: GPUAdapter;
} | null>;
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