export declare const isImageFile: (filename: string) => boolean;
export declare const isVideoFile: (filename: string) => boolean;
export declare const isGifFile: (filename: string) => boolean;
export declare const isImageOrVideoOrGifFile: (filename: string) => boolean;
/** returns true if content can't change for a given url */
export declare const hasFixedContentAddress: (uri: string) => boolean;
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