import { AssetResult, BlockAPI, CompleteAssetResult, CreativeEngine } from '@cesdk/cesdk-js';
export declare function ensureMetadataKeys(engine: {
    block: BlockAPI;
}, block: number, asset: AssetResult, sourceId: string): void;
export declare const isBlockFromSource: (block: number, sourceId: string, engine: CreativeEngine) => boolean;
export declare const getSourceIdFromBlock: (block: number, engine: CreativeEngine) => string | null;
export declare const getExternalIdFromBlock: (block: number, engine: CreativeEngine) => string | null;
export declare function ensureAssetDuration(engine: {
    block: BlockAPI;
}, asset: CompleteAssetResult, block: number): Promise<void>;