/**
 * Media natural-size registry.
 *
 * Media layers (ImageTexture, VideoTexture, WebcamTexture) are resize-fit generators: without an
 * explicit bounding box they fill the frame and expose no intrinsic size — which makes them
 * unmeasurable for layout (a stack can't slot an element whose height it can't know). This registry
 * is the browser's `<img naturalWidth>` equivalent: media shaders publish their source's pixel
 * dimensions here as soon as they're known (image decode, video metadata, webcam stream), keyed by
 * URL (webcam uses its device-scoped key).
 *
 * Consumers: `measureNode` (layout measurement) and the Design Editor (natural-size boxes).
 * Listeners fire when a size lands so a layout that measured a still-loading image can re-run.
 */
export interface NaturalSize {
    width: number;
    height: number;
}
/** Publish a media source's intrinsic pixel dimensions (no-op for degenerate sizes). */
export declare function registerNaturalSize(key: string, width: number, height: number): void;
/** Intrinsic pixel dimensions for a media source, if its shader has published them. */
export declare function getNaturalSize(key: string): NaturalSize | null;
/** Subscribe to natural-size arrivals (layout re-measure). Returns an unsubscribe. */
export declare function onNaturalSizeChange(fn: () => void): () => void;
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