/**
 * Lossless ClickHouse SQL lexer: concatenating every token's `text` reproduces
 * the input exactly. It follows ClickHouse's own lexer closely enough to tell
 * code from strings, quoted identifiers and comments, and names from numbers;
 * it is not a parser.
 */
export type SQLTokenKind = 'whitespace' | 'line_comment' | 'block_comment' | 'string' | 'quoted_identifier' | 'identifier' | 'number' | 'punctuation';
export interface SQLToken {
    kind: SQLTokenKind;
    /** Exact source text of the token. */
    text: string;
    /** Offset of the first character in the input. */
    start: number;
    /** Offset just past the last character. */
    end: number;
    /**
     * `false` only for a string, quoted identifier or block comment that runs to
     * the end of the input without its closing delimiter.
     */
    terminated: boolean;
}
export declare function tokenizeSQL(sql: string): SQLToken[];
/** Whitespace and comments: tokens that never change what a statement means. */
export declare function isTrivia(token: SQLToken): boolean;
/** The name an identifier token denotes: bare text, or the unquoted value. */
export declare function identifierName(token: SQLToken): string | undefined;
/** The value of a terminated string literal (`'…'` or a `$tag$…$tag$` heredoc). */
export declare function stringLiteralValue(token: SQLToken): string | undefined;
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