import type { QueryExecutor } from './introspect';
/** `pg_proc.provolatile`: `i` immutable, `s` stable, `v` volatile. */
export type Volatility = 'i' | 's' | 'v';
export interface ProcVolatility {
    /** Schema-qualified name, or bare name if in `pg_catalog` / a common system schema. */
    name: string;
    volatility: Volatility;
    isSecurityDefiner: boolean;
    /** True if this is a built-in / system function (we usually allow-list these). */
    isSystem: boolean;
}
/**
 * Look up `(schema, name)` tuples in pg_proc and return their volatility.
 * Returns a map keyed by the two names the AST walker might see:
 *   - `schema.name` (schema-qualified)
 *   - `name` (unqualified; only used when the function lives in `pg_catalog`)
 */
export declare function lookupVolatility(exec: QueryExecutor, names: Array<{
    schema?: string;
    name: string;
}>): Promise<Map<string, ProcVolatility>>;