/**
 * Rendered text -> a typed value for the declared column type.
 *
 * The engine produces strings; a typed container needs real values. Everything
 * that cannot be represented exactly is an ERROR, never a silent rounding or a
 * truncation — a synthetic dataset that quietly loses digits is worse than one
 * that refuses to be written.
 * Spec: docs/specs/2026-07-19-typed-output-and-parquet-writer.md §5.
 */
import type { ColumnType } from '../column-type.js';
/** A value ready for PLAIN encoding; `null` means the column is NULL on this row. */
export type TypedValue = null | boolean | number | bigint | string | Uint8Array;
/**
 * Convert one rendered cell. Throws a message describing the value and the
 * expectation; the writer adds the column name and row index around it.
 */
export declare function convertValue(raw: string, type: ColumnType): TypedValue;
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