export declare class SyncStdio {
    private bufferedData;
    private readonly stderr;
    private readonly stdin;
    private readonly stdout;
    private readonly readBuffer;
    constructor({ errorFD, readFD, writeFD }: SyncStdioOptions);
    writeErrorLine(line: string): void;
    writeLine(line: string): void;
    readLine(): string | undefined;
    private writeBuffer;
}
export interface SyncStdioOptions {
    /**
     * The file descriptor from which data is to be read. This MUST be opened for
     * blocking (O_SYNC) reading.
     */
    readonly readFD: number;
    /**
     * The file descriptor to which data is to be written. This SHOULD be opened
     * for blocking (O_SYNC) writing.
     */
    readonly writeFD: number;
    /**
     * The file descriptor to which errors data is to be written. This SHOULD be
     * opened for blocking (O_SYNC) writing.
     */
    readonly errorFD: number;
}
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