import { Column } from './column';
import { ColumnsMap, TypeMap } from './types/mappings';
export declare class ColumnAccessor<T extends TypeMap = any> {
    private _data;
    private _labels_to_indices;
    constructor(_data: ColumnsMap<T>);
    private _names;
    get names(): readonly (string & keyof T)[];
    private _types;
    get types(): T;
    private _columns;
    get columns(): readonly Column<T[keyof T]>[];
    get length(): number;
    has(name: string): boolean;
    get<R extends keyof T>(name: R): ColumnsMap<T>[R];
    addColumns<R extends TypeMap>(data: ColumnsMap<R> | ColumnAccessor<R>): ColumnAccessor<{ [P in keyof (T & R)]: P extends keyof R ? R[P] : P extends keyof T ? T[P] : never; }>;
    dropColumns<R extends keyof T>(names: readonly R[]): ColumnAccessor<{ [P in Exclude<keyof T, R>]: T[P]; }>;
    selectByColumnName<R extends keyof T>(name: R): ColumnAccessor<{ [P in R]: T[P]; }>;
    selectByColumnNames<R extends keyof T>(names: readonly R[]): ColumnAccessor<{ [P in R]: T[P]; }>;
    columnNameToColumnIndex(name: keyof T): number | undefined;
}
//# sourceMappingURL=column_accessor.d.ts.map