/**
 * Single-source type mapping between PostgreSQL, PostGraphile GraphQL, and FieldType.
 *
 * This is the canonical mapping table. All other mappers and tests derive from it:
 * - `mapPgTypeToFieldType` in export-utils.ts
 * - `mapGraphQLTypeToFieldType` in graphql-naming.ts
 * - `pgUdtToGraphQLType` / `pgUdtToGraphQLKind` in cross-flow-parity test
 * - parity table in dynamic-fields test
 *
 * When a new type needs to be supported, add it here and all consumers update automatically.
 */
import { FieldType } from './export-utils';
export interface TypeMapEntry {
    /** PostgreSQL udt_name values from information_schema (e.g. ['int4', 'int2']) */
    pgUdtNames: string[];
    /** PostGraphile v5 GraphQL type name (e.g. 'Int', 'BigInt', 'Datetime') */
    gqlTypeName: string;
    /** FieldType used by csv-to-pg Parser (e.g. 'int', 'timestamptz') */
    fieldType: FieldType;
    /** GraphQL kind that PostGraphile reports via introspection */
    gqlKind: 'SCALAR' | 'OBJECT' | 'ENUM';
    /** Whether this is a PostgreSQL array type (e.g. _uuid, _text, _jsonb) */
    isArray?: boolean;
}
/**
 * Canonical PG → GraphQL → FieldType mapping table.
 * Aligned with PostGraphile v5's PgCodecsPlugin type assignments:
 *   - int2, int4 → Int
 *   - int8 (bigint) → BigInt
 *   - numeric → BigFloat
 *   - float4, float8 → Float
 *   - interval → Interval (OBJECT kind, not SCALAR)
 *   - timestamptz, timestamp → Datetime
 */
export declare const PG_TYPE_MAP: TypeMapEntry[];
/**
 * Look up a TypeMapEntry by PostgreSQL udt_name.
 * Returns undefined for unknown types (callers should fall back to 'text').
 */
export declare const lookupByPgUdt: (udtName: string) => TypeMapEntry | undefined;
/**
 * Look up a TypeMapEntry by GraphQL type name.
 * Returns undefined for unknown types (callers should fall back to 'text').
 */
export declare const lookupByGqlType: (gqlTypeName: string) => TypeMapEntry | undefined;