export declare function csv(items: Array<any> | string): string;
declare type ImageType = 'webp' | 'png';
export declare function avatarUrl(avatarId: string, pixels?: number, imgType?: ImageType): string;
interface AvatarItemBase {
    avatarId: string;
    avatarUrl(pixels?: number, imgType?: ImageType): string;
}
/** Add an avatar-URL-generating `avatarUrl()` method to an object that has an `avatarId` field. */
export declare function attachAvatarUrlToItem<item extends AvatarItemBase>(item: item): item;
/** Add avatar-URL-generating `avatarUrl()` methods to an objects that have an `avatarId` field. */
export declare function attachAvatarUrlToArrayItems<item extends AvatarItemBase>(items: item[]): item[];
/** For an HTTP query object, convert all array values into CSVs. */
export declare function cleanQuery(query?: {
    [param: string]: string | boolean | string[] | number | null | undefined;
}): {
    [param: string]: string | number | boolean;
};
export declare function capitalize(string: string): string;
export {};
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