export type NewlineLogicalName = 'lf' | 'crlf' | 'cr' | 'space';
export type NewlineOption = NewlineLogicalName | '\n' | '\r\n' | '\r' | ' ';
export type IndentCharLogicalName = 'space' | 'tab';
export type IndentCharOption = IndentCharLogicalName | string;
export type CommaBreakStyle = 'none' | 'before' | 'after';
/**
 * SqlPrintHelper provides utility methods for SQL pretty printing.
 */
export declare class LinePrinter {
    indentChar: IndentCharOption;
    indentSize: number;
    newline: NewlineOption;
    commaBreak: CommaBreakStyle;
    lines: PrintLine[];
    /**
     * @param indentChar Character used for indentation (default: ' ') // Accepts logical names like 'space'/'tab'
     * @param indentSize Number of indentChar per level (default: 0)
     * @param newline Newline string (default: '\r\n') // Accepts logical names like 'lf'/'crlf'/'cr'
     * @param commaBreak Comma break style (default: 'none')
     */
    constructor(indentChar?: IndentCharOption, indentSize?: number, newline?: NewlineOption, commaBreak?: CommaBreakStyle);
    print(): string;
    /**
     * Returns the indent string for a given level.
     * @param level Indentation level
     */
    private indent;
    /**
     * Appends a newline token to the given tokens array if newline is set, or adds an empty line if tokens is empty.
     * @param tokens Array of token objects with 'level' and 'text' property
     * @param level Indentation level
     */
    appendNewline(level: number): void;
    /**
     * Appends text to the last element of tokens array.
     * @param tokens Array of token objects with 'text' property
     * @param text Text to append
     */
    appendText(text: string): void;
    private endsWithAsciiWhitespace;
    trimTrailingWhitespaceFromPreviousLine(): void;
    private findLineEndIndex;
    /**
     * Cleans up the current line for comma formatting.
     * For 'after' and 'none' comma styles, removes empty line when a comma is being added.
     * @returns true if cleanup was performed, false otherwise
     */
    cleanupLine(): boolean;
    private isAsciiWhitespaceOnly;
    private lineHasTrailingComment;
    getCurrentLine(): PrintLine;
    /**
     * Checks if the current line is empty (has no text content)
     * @returns true if current line is empty, false otherwise
     */
    isCurrentLineEmpty(): boolean;
}
export declare class PrintLine {
    level: number;
    text: string;
    constructor(level: number, text: string);
}