import { TransformerBase } from '../base';
import { Params } from '../base/estimator';
import { CSRMatrix } from '../data';
export type HasherInput = 'dict' | 'pair' | 'string';
export interface FeatureHasherProps {
    nFeatures?: number;
    inputType?: HasherInput;
    alternateSign?: boolean;
}
export declare class FeatureHasher extends TransformerBase<any, any> {
    private nFeatures;
    private inputType;
    private alternateSign;
    constructor(props?: FeatureHasherProps);
    getParams(): Params;
    fit(_X: any[]): void;
    transform(X: any[]): CSRMatrix;
}