/** Returns a bare-safe identifier unchanged; otherwise double-quotes it, doubling embedded double quotes. */
export declare function quoteIdentifier(identifier: string): string;
/** Applies {@link quoteIdentifier} to each `.`-separated component, keeping the dot separator. */
export declare function quoteQualifiedIdentifier(qualified: string): string;
/**
 * Quotes a SQL string literal, doubling any embedded backslash and then any embedded single quote.
 *
 * Redshift processes backslash escape sequences in string literals, so a backslash is doubled to be read as written.
 */
export declare function quoteLiteral(literal: string): string;