import { TransformerBase } from '../base';
import { Params } from '../base/estimator';
import { CSRMatrix, TextDocuments } from '../data';
export interface HashingVectorizerProps {
    nFeatures?: number;
    lowercase?: boolean;
    stopWords?: string[];
    ngramRange?: [number, number];
    binary?: boolean;
    norm?: 'l1' | 'l2' | null;
    alternateSign?: boolean;
}
export declare class HashingVectorizer extends TransformerBase<TextDocuments, CSRMatrix> {
    readonly acceptedInputKinds: readonly ["text"];
    private nFeatures;
    private lowercase;
    private stopWords;
    private ngramRange;
    private binary;
    private norm;
    private alternateSign;
    constructor(props?: HashingVectorizerProps);
    getParams(): Params;
    private analyze;
    fit(documents: string[]): void;
    transform(documents: string[]): CSRMatrix;
}