/*! Copyright 2023 the gnablib contributors MPL-1.1 */
export declare class StringBuilder {
    private readonly _nl;
    private readonly _parts;
    constructor(newline?: string);
    get length(): number;
    append(content: string): void;
    appendLine(content?: string): void;
    clear(): void;
    cutLast(num?: number): string;
    toString(): string;
}