/**
 * @internal
 */
export declare const read: unique symbol;
/**
 * a pipe source should be able to write its output to a pipe target
 *
 * @public
 */
export interface PipeSource<T> {
    pipe: (target: PipeTarget<T>) => void;
    unpipe: () => void;
}
/**
 * a pipe target can receive data from a pipe source
 *
 * @public
 */
export interface PipeTarget<T, S = PipeSource<T>> {
    [read]: (value: T, source?: S) => void;
}
/**
 * @public
 */
export interface Pipe<TIn, TOut> extends PipeTarget<TIn>, PipeSource<TOut> {
}
/**
 * @public
 */
export declare class Transform<TIn, TOut> implements PipeTarget<TIn, PipeSource<TIn>>, PipeSource<TOut> {
    handler: (value: TIn, source?: PipeSource<TIn>) => TOut;
    private target;
    /**
     * creates a pipe that transforms data from `TIn` to `TOut`
     * @param handler - transform data in pipe
     */
    constructor(handler: (value: TIn) => TOut);
    pipe(target: PipeTarget<TOut>): void;
    unpipe(): void;
    /**
     * @internal
     */
    [read](value: TIn, source?: PipeSource<TIn>): void;
}
/**
 * @public
 */
declare const to: {
    <T>(fn: (v: T, s?: PipeSource<T>) => any): PipeTarget<T>;
    console(level?: ConsoleLevel): {
        [read]: ((message?: any, ...optionalParams: any[]) => void) | ((message?: any, ...optionalParams: any[]) => void) | ((message?: any, ...optionalParams: any[]) => void) | ((message?: any, ...optionalParams: any[]) => void);
    };
};
/**
 * @public
 */
export type ConsoleLevel = 'debug' | 'log' | 'warn' | 'error';
export { to };
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