/**
 * Validation for `type="…"` on a `<data>` — the typed output column.
 *
 * Caught at LOAD time rather than partway through writing a file: a bad type
 * discovered mid-write leaves a truncated .parquet behind, and the message
 * would point at a row instead of at the config.
 */
import { type Diagnostic } from '../errors/index.js';
import type { AttrContext } from '../generated/TDCParser.js';
/**
 * `if=` on a named `<data>`, or on the `<line>` holding one.
 *
 * A named `<data>` declares a typed output COLUMN, and a column has one cell per
 * card — the columnar writer collects it once per row and never asks whether the
 * line was rendered. So the condition was simply dropped, and the typed file
 * disagreed with the text rendering of the same config:
 *
 *     text        1  /  X  /  2  /  3  /  4END
 *     parquet     id=[1,2,3,4]  tail=['END','END','END','END']
 *                               only_first=['X','X','X','X']
 *
 * `each=` on a line holding a named `<data>` is refused one function over
 * (TDC209) for exactly this reason — "typed columns are collected once per
 * card". This is the same sentence about a different attribute.
 *
 * The working spelling is to put the condition on the SEQUENCE rather than on
 * the column: a `<gen if="…">` that produces nothing leaves the cell empty, and
 * an empty cell in a nullable column is a NULL — which is what a missing value
 * means in a typed file.
 */
export declare const CONDITIONAL_COLUMN_HINT: string;
export declare function checkDataColumnConditional(attrList: readonly AttrContext[], dAttrs: Record<string, string | undefined>, diagnostics: Diagnostic[]): void;
export declare function checkDataColumnType(attrList: readonly AttrContext[], dAttrs: Record<string, string | undefined>, diagnostics: Diagnostic[]): void;
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