/**
 * Pure helpers for `model3d` (embedded GLB/GLTF) elements (Svelte port of the
 * vanilla binding's `renderModel3dElement`). The actual scene mounting is
 * stateful (DOM refs, an async lifecycle) and lives in the `Model3dView` SFC
 * via the shared framework-free `mountModel3D` controller; this module only
 * holds the pure data-URL -> blob-URL conversion so it stays unit-testable
 * without a DOM.
 */
/** Default MIME for GLB binaries when the element omits `modelMimeType`. */
export declare const DEFAULT_MODEL_MIME = "model/gltf-binary";
/**
 * Convert the base64 `modelData` data URL to a blob (object) URL the shared
 * GLTF loader can fetch. Returns undefined for missing / malformed data URLs.
 */
export declare function modelDataToBlobUrl(dataUrl: string | undefined, mimeType: string | undefined): string | undefined;
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