export interface IStringBuilder {
    /**
     * Sets the string builder's capacity
     *
     * @param capacity The new capacity
     */
    setCapacity(capacity: number | undefined): IStringBuilder;
    /**
     * Appends `content`
     *
     * @param content The content to append
     */
    append(content: any): IStringBuilder;
    /**
     * Appends `content` `count` times
     *
     * @param content The content to append
     * @param count How many times you want to append it
     */
    appendRepeat(content: any, count: number): IStringBuilder;
    /**
     * Appends `content` as a line
     *
     * @param content The line content
     */
    appendLine(content: any): IStringBuilder;
    /**
     * Appends `content` as lines `count` times
     *
     * @param content The line content
     * @param count How many times you want to append it
     */
    appendLineRepeat(content: any, count: number): IStringBuilder;
    /**
     * Appends all lines
     *
     * @param contents The lines
     */
    appendLines(...contents: any[]): IStringBuilder;
    /**
     * Appends an empty new line
     */
    appendEmptyLine(): IStringBuilder;
    /**
     * Appends `count` empty new lines
     *
     * @param count How many times you want to append it
     */
    appendEmptyLines(count: number): IStringBuilder;
    /**
     * Sets the content
     *
     * @param content The content
     */
    setContent(content: any): IStringBuilder;
    /**
     * Clears the content (sets to undefined)
     */
    clear(): IStringBuilder;
    /**
     * Checks if the content is equal to `other`
     *
     * @param other The string to compare with
     */
    equals(other: string): boolean;
    /**
     * Checks if the content is empty
     */
    isEmpty(): boolean;
    /**
     * Returns the substring at `start` of length `end` (if provided), else, the rest of the content
     *
     * @param start Start index
     * @param end Length
     */
    substring(start: number, end?: number | undefined): string | undefined;
    /**
     * Return the content as string
     */
    toString(): string | undefined;
}
export declare class OutOfRangeError extends Error {
}
export declare class StringBuilder implements IStringBuilder {
    protected content: string | undefined;
    protected capacity: number | undefined;
    constructor(content?: string, capacity?: number);
    setCapacity(capacity: number | undefined): IStringBuilder;
    append(content: any): IStringBuilder;
    appendRepeat(content: any, count: number): IStringBuilder;
    appendLine(content: any): IStringBuilder;
    appendLineRepeat(content: any, count: number): IStringBuilder;
    appendLines(...contents: any[]): IStringBuilder;
    appendEmptyLine(): IStringBuilder;
    appendEmptyLines(count: number): IStringBuilder;
    setContent(content: any): IStringBuilder;
    clear(): IStringBuilder;
    substring(start: number, end?: number | undefined): string | undefined;
    isEmpty(): boolean;
    equals(other: string): boolean;
    toString(): string | undefined;
}