interface FieldMapping<T = any, R = any> {
    [key: string]: string | ((data: T) => R) | undefined;
}
export declare function getFieldValue<T, R = any>(data: T, fieldKey: string): R | undefined;
export declare function getFieldValue<T, R = any>(data: T, fieldKey: string, mapping: FieldMapping<T, R>): R | undefined;
export declare const getAvatarText: (name: string) => string;
export declare const isWalkIn: (customer_id?: number | string) => boolean;
export {};
