export declare const isValidImageType: (mimeType: string | undefined) => boolean;
export declare const getFileUrlWithSize: (fileUrl: string, size?: "small" | "medium" | "large" | "full") => string;
export declare function capitalize(value: string): string;
export declare const isPinnedPost: (post: any) => post is Amity.PinnedPost;
/**
 * Strips non-serializable properties (functions, class instances) from an
 * Amity.Community SDK object before passing it as a React Navigation param.
 * React Navigation warns when navigation state contains non-serializable
 * values; SDK objects can contain methods such as `createInvitations`.
 */
export declare const serializeCommunity: (community: Amity.Community | undefined | null) => Amity.Community | undefined;
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