import { DEFAULT_DELIMITER, DEFAULT_QUOTATION } from '../../core/constants';
import { StringCSVLexer, StringCSVLexerTransformerStreamOptions, Token } from '../../core/types';
/**
 * A transform stream that converts a stream of strings into a stream of tokens.
 *
 * For most use cases, prefer the factory function {@link createStringCSVLexerTransformer}.
 * Use this class directly only when you need a custom lexer implementation.
 *
 * @category Low-level API
 *
 * @param lexer - A StringCSVLexer instance (required). Use {@link createStringCSVLexer} to create one.
 * @param options - Stream-specific options (backpressureCheckInterval, etc.)
 * @param writableStrategy - Strategy for the writable side (default: `{ highWaterMark: 65536, size: chunk => chunk.length }`)
 * @param readableStrategy - Strategy for the readable side (default: `{ highWaterMark: 1024, size: () => 1 }`)
 *
 * @see {@link https://github.com/kamiazya/web-csv-toolbox/blob/main/docs/how-to-guides/choosing-the-right-api.md | Choosing the Right API} for guidance on selecting the appropriate API level.
 *
 * @example Custom lexer implementation
 * ```ts
 * import { StringCSVLexerTransformer, type StringCSVLexer, type Token } from 'web-csv-toolbox';
 *
 * // Custom lexer for non-standard CSV dialect
 * class MyCustomLexer implements StringCSVLexer {
 *   lex(chunk?: string, options?: { stream?: boolean }): IterableIterator<Token> {
 *     // Return an iterator (can use internal generator)
 *     return this.#tokens();
 *   }
 *   *#tokens(): Generator<Token> {
 *     // Actual token generation logic
 *   }
 * }
 *
 * const customLexer = new MyCustomLexer();
 * stream.pipeThrough(new StringCSVLexerTransformer(customLexer));
 * ```
 */
export declare class StringCSVLexerTransformer<_Delimiter extends string = DEFAULT_DELIMITER, _Quotation extends string = DEFAULT_QUOTATION> extends TransformStream<string, Token> {
    readonly lexer: StringCSVLexer;
    /**
     * Yields to the event loop to allow backpressure handling.
     * Can be overridden for testing purposes.
     * @internal
     */
    protected yieldToEventLoop(): Promise<void>;
    constructor(lexer: StringCSVLexer, options?: StringCSVLexerTransformerStreamOptions, writableStrategy?: QueuingStrategy<string>, readableStrategy?: QueuingStrategy<Token>);
}