/** Canonical form: drop casts/brackets/parens, fold `= ANY (ARRAY[…])` back to `IN`, lower-case, collapse whitespace. */
export declare function normalizeCheckExpr(expr: string): string;
/** True when two CHECK expressions are equivalent after normalization. */
export declare function checkExprEquals(a: string | undefined, b: string | undefined): boolean;
/**
 * `CHECK (<expr>)` → `<expr>` (balanced outer wrapper); returns input unchanged
 * if there is no CHECK wrapper. Tolerates a trailing constraint modifier suffix
 * (`pg_get_constraintdef` can return `CHECK (<expr>) NOT VALID`) so the wrapper
 * still strips cleanly to the inner expression instead of falling through to the
 * unchanged-input fallback (which would cause spurious drop+add churn).
 */
export declare function stripCheckWrapper(def: string): string;
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