/**
 * Deterministic constraint-ordering pass over a single drizzle-kit-generated
 * Postgres migration file.
 *
 * drizzle-kit `generate` emits an incremental delta as a sequence of
 * statements separated by `--> statement-breakpoint`. When an upgrade adds a
 * composite UNIQUE (or PRIMARY KEY) constraint to a parent table AND a new
 * foreign key on a child table that REFERENCES that column set, drizzle-kit
 * can emit the child `ADD CONSTRAINT … FOREIGN KEY` BEFORE the parent
 * `ADD CONSTRAINT … UNIQUE`. Postgres then rejects the FK at apply time with
 *
 *   there is no unique constraint matching given keys for referenced table
 *
 * (A real Attend upgrade delta placed 17 parent UNIQUE constraints after the
 * FKs consuming them.) Constraint replacements expose the inverse problem:
 * drizzle-kit can emit the parent `DROP CONSTRAINT … UNIQUE` before dropping
 * the child FK that still depends on it. Postgres rejects that with 2BP01.
 *
 * This pass reorders ONLY those dependency-linked standalone statements:
 *
 * - a UNIQUE/PRIMARY KEY add is pulled before the earliest FK add consuming it;
 * - a replacement FK drop is pulled before the referenced UNIQUE/PK drop.
 *
 * A bare DROP does not encode its constraint type, so replacement-drop
 * dependencies are inferred from the same-named ADD definitions later in the
 * delta. Statements not participating in a UNIQUE↔FK dependency keep their
 * relative order. The transform is therefore a no-op (byte-identical output)
 * on any already-correct migration — including every fresh
 * `0000_*.sql`, where UNIQUE constraints are inline in CREATE TABLE.
 */
/**
 * Reorder standalone constraint statements within one migration file so a
 * referenced UNIQUE/PRIMARY KEY precedes every FK that consumes it when adding
 * constraints, and every dependent FK precedes that referenced key when
 * dropping replacement constraints. Returns the input unchanged
 * (byte-identical) when nothing is misordered.
 */
export declare function reorderPgConstraintStatements(sql: string): string;
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