import { Transform, TransformCallback } from 'stream';
import { MaskOptions, Paths } from '../utils';
export interface MaskStreamOptions<T = any> extends MaskOptions {
    /** Schema for masking fields in object mode. */
    schema?: Partial<Record<Paths<T> & string, MaskOptions>>;
    /** 'mask' (blocklist) or 'allow' (allowlist). */
    mode?: 'mask' | 'allow';
    /** Allow injecting a specific config instead of loading global file. */
    configOverride?: MaskOptions;
}
export declare class MaskifyStream<T = any> extends Transform {
    private readonly schema;
    private readonly options;
    private readonly configOverride?;
    constructor(schema?: Partial<Record<Paths<T> & string, MaskOptions>>, options?: MaskStreamOptions<T>);
    _transform(chunk: unknown, _encoding: BufferEncoding, callback: TransformCallback): void;
}
export declare function createMaskStream<T = any>(schema?: Partial<Record<Paths<T> & string, MaskOptions>>, options?: MaskStreamOptions<T>): MaskifyStream<T>;
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