/**
 * Detect CHECK constraints that only enforce NOT NULL on a single column.
 * Used to align shadow vs target when constraint names differ but behavior matches.
 */
export declare function stripOuterParens(expr: string): string;
/**
 * If `check_clause` is a single-column `IS NOT NULL`, return that column's name (unquoted).
 * Otherwise null.
 */
export declare function parseSingleColumnIsNotNullColumn(checkClause: string | null | undefined): string | null;
/**
 * Stable key for "this CHECK is just NOT NULL on column X of table T".
 * Used to match source vs target without requiring identical constraint names.
 */
export declare function notNullCheckEquivalenceKey(tableName: string, constraintType: string, checkClause: string | null | undefined, columnName: string | null | undefined): string | null;
export declare function collectNotNullCheckKeys(rows: Array<{
    table_name: string;
    constraint_type: string;
    check_clause?: string | null;
    column_name?: string | null;
}>): Set<string>;
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