/**
 * The **Import Validator** — inspects a parsed {@link Workbook} (and the derived
 * header row) *before* any data reaches the grid, so problems are surfaced as
 * friendly, actionable messages instead of being silently swallowed or blowing
 * up mid-render.
 *
 * Validation is split into two phases so the pipeline can fail fast:
 * - {@link ImportValidator.validateWorkbook} — structural checks on the raw
 *   workbook (empty workbook, no data rows, ragged rows).
 * - {@link ImportValidator.validateHeaders} — header-level checks once the
 *   header row is known (blank headers, duplicate headers).
 *
 * Formula-level validation (malformed expressions, circular references) is
 * intentionally **not** re-implemented here: those are detected authoritatively
 * by the Formula Engine when the rows are registered (a bad formula stores as
 * `#ERROR!`, a cycle as `#CIRC!`). Duplicating that logic would violate the
 * single-source-of-truth rule.
 *
 * @packageDocumentation
 */
import { type ImportValidationIssue, type ImportValidationResult } from '../../../types/import.types';
import type { WorkbookSheet } from '../model/workbook';
/** Stateless workbook / header validation. */
export declare class ImportValidator {
    /**
     * Combines a set of issues into a result, computing {@link ImportValidationResult.valid}.
     *
     * @param issues - All issues discovered across phases.
     * @returns The aggregated result.
     */
    static toResult(issues: readonly ImportValidationIssue[]): ImportValidationResult;
    /**
     * Structural validation of the chosen sheet.
     *
     * @param sheet          - The sheet to import, or `undefined` when the workbook was empty.
     * @param hasHeaderRow   - Whether the first row is a header row.
     * @returns The issues found (may be empty).
     */
    static validateWorkbook(sheet: WorkbookSheet | undefined, hasHeaderRow: boolean): ImportValidationIssue[];
    /**
     * Header-level validation once the header row has been resolved.
     *
     * @param headers - The resolved header strings, in column order.
     * @returns The issues found (may be empty).
     */
    static validateHeaders(headers: readonly string[]): ImportValidationIssue[];
}
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