/**
 * Minimal inline port of the `pg-format` helpers this package uses, so the
 * package carries no runtime dependency for them (the CommonJS-only
 * `pg-format` package is awkward to consume from ESM/bundled CLIs).
 *
 * Mirrors `pg-format@1.0.4` byte-for-byte for the inputs postgres-meta feeds
 * it — in particular numbers are quoted (`literal(10)` is `'10'`), because
 * that is what postgres-meta's SQL emits and this package is byte-parity
 * constrained against it. The `supabase/supabase` `packages/pg-meta` port
 * deliberately diverges here (unquoted numbers); do not "fix" this to match it.
 *
 * Originally ported from PostgreSQL's `src/interfaces/libpq/fe-exec.c`.
 */
/**
 * Quote a value as a SQL literal. `null`/`undefined` become `NULL`, booleans
 * `'t'`/`'f'`, dates ISO 8601 strings, arrays comma-separated lists (nested
 * arrays become parenthesised groups), plain objects `'…'::jsonb`, and
 * everything else — including numbers — a single-quoted string with embedded
 * quotes doubled. Strings containing a backslash use the `E'…'` form.
 */
export declare function literal(value?: unknown): string;