type QuoteChar = "'" | '"' | '`';
export declare function isQuoteChar(char: string | undefined): char is QuoteChar;
export declare function findQuoteEnd(sql: string, start: number, quote: string): number;
/**
 * Peel one layer of wrapping parentheses, but only when the leading `(` closes
 * at the very end — so `(a, b)` becomes `a, b` while `(a), (b)` is left intact.
 */
export declare function stripWrappingParens(input: string): string;
/**
 * Index of the `)` that matches the `(` at `openIndex`, or undefined when the
 * parens are unbalanced.
 */
export declare function findMatchingParen(input: string, openIndex: number): number | undefined;
/** Find a clause/delimiter outside quoted strings, identifiers and parentheses. */
export declare function findTopLevelSQLPattern(sql: string, pattern: RegExp): {
    index: number;
    length: number;
} | undefined;
export {};
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