import { TransformerBase } from '../base';
import { Params } from '../base/estimator';
import { CSRMatrix, TextDocuments } from '../data';
import { CountVectorizerProps } from './countVectorizer';
import { TfidfTransformerProps } from './tfidfTransformer';
export interface TfidfVectorizerProps extends CountVectorizerProps, TfidfTransformerProps {
}
export declare class TfidfVectorizer extends TransformerBase<TextDocuments, CSRMatrix> {
    readonly acceptedInputKinds: readonly ["text"];
    private props;
    private countState?;
    private tfidfState?;
    constructor(props?: TfidfVectorizerProps);
    getParams(): Params;
    fit(documents: string[]): void;
    transform(documents: string[]): CSRMatrix;
    get vocabulary(): ReadonlyMap<string, number>;
    get idf(): number[];
    getFeatureNamesOut(): string[];
}