/**
 * Semantic equality for catalog constraint rows (shadow vs target).
 * Avoids false "constraint has changed" when Postgres catalog shape differs cosmetically.
 */
export declare function normalizeReferentialAction(rule: string | null | undefined): string;
/** Sorted, comma-separated column list for multi-column UNIQUE / PK / FK. */
export declare function normalizeConstraintColumnList(columnName: string | null | undefined): string;
/**
 * Collapse whitespace / casing / redundant parens on CHECK expressions so
 * catalog text matches state SQL after apply.
 */
export declare function normalizeCheckClauseForCompare(clause: string | null | undefined): string;
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