import type { sheets_v4 } from '@googleapis/sheets';
export type InputTypes = boolean | string | number | null;
export type RowArray = string[];
export type RowObject = {
  [key: string]: string;
};
export type InputRowArray = InputTypes[];
export type InputRowObject = {
  [key: string]: InputTypes;
};
export type GoogleAuthInput =
  | {
      email: string;
      key: string;
    }
  | {
      client_email: string;
      private_key: string;
    };
export interface GSheetOptions {
  jwt?: GoogleAuthInput;
  spreadsheetId: string;
  range: string;
  http2?: boolean;
  preload?: boolean;
  interval?: number;
  headerRows?: number;
  keyTransform?: Gsheet['keyTransform'];
  sanitize?: Gsheet['sanitize'];
  filter?: Gsheet['filter'];
}
export declare const gSheetDate: (date?: Date) => string;
export declare const gSheetDateTime: (date?: Date) => string;
export declare const trim: <T extends InputTypes>(arg: T) => string | T;
export declare const noChange: (arg: string) => string;
export declare const noFilter: () => boolean;
export declare class Gsheet {
  private client;
  private auth;
  private spreadsheetId;
  private range;
  private headerRows;
  private keyTransform;
  private sanitize;
  private filter;
  private keptSheet;
  private keptColumns;
  constructor(options: GSheetOptions);
  private getSheet;
  private getHeaderRowsOnly;
  private getColumnsFromSheetCache;
  private getColumns;
  columns(): Promise<string[]>;
  rows(): Promise<string[][]>;
  data(): Promise<RowObject[]>;
  private normalizeInputData;
  append(
    arg: InputRowArray | InputRowObject
  ): Promise<import('gaxios').GaxiosResponse<sheets_v4.Schema$AppendValuesResponse>>;
  refresh(): void;
  keepFresh(interval: number): void;
}
export declare const gsheet: (options: GSheetOptions) => Gsheet;
export default gsheet;