/**
 * Stable scalar cell types supported by the public API.
 */
type ExcelColumnDataType = "text" | "number" | "date" | "image";
/**
 * Runtime support:
 * - Browser ESM environments with `Blob`, `FileReader`, `fetch`, and `URL.createObjectURL`.
 * - Node.js can use `fromExcel`, `toExcel`, and `generateExcelTemplate` when compatible browser globals are available.
 *
 * Known limitations:
 * - Schema-based import validates headers strictly against `columns[].name` order and position.
 * - Grouped export expects parent columns and data groups to be declared before children.
 * - Image export requires `imageFetcher`.
 */
interface ExcelDefinition {
    /** File name used for template/export downloads. */
    name: string;
    /** Worksheet name used for export and preferred during import. */
    sheetName?: string;
    /** Stable schema definition for worksheet columns. */
    columns: ExcelColumnDefinition[];
    /** Optional workbook author metadata written into generated files. */
    author?: string;
    /** Workbook creation time accepted as a `Date` or ISO-like string. */
    createTime?: Date | string;
    /** Optional merged title row rendered above the header. */
    title?: string;
    /** Height of the optional merged title row in worksheet units. */
    titleHeight?: number;
    /** Format applied to the optional merged title row. */
    titleFormat?: ExcelCellFormatDefinition;
    /** Maximum upload size (in bytes) enforced for browser-based imports. Defaults to 25 MiB when omitted. */
    maxFileSizeBytes?: number;
    /** Default height used for data rows when exporting a worksheet. */
    defaultRowHeight?: number;
    /** Height applied to header rows during template/export generation. */
    headerRowHeight?: number;
    /** Horizontal column offset before writing the header. */
    dx?: number;
    /** Vertical row offset before writing the header. */
    dy?: number;
    /** Freezes the header area so column labels remain visible while scrolling. */
    isHeaderFreeze?: boolean;
    /** Optional progress callback receiving values from `0` to `100` during long-running work. */
    progressCallback?: (progress: number) => void;
    /**
     * Required when any exported column uses `dataType: "image"`.
     * The callback must resolve to image bytes for the provided URL or identifier.
     */
    imageFetcher?: (url: string) => Promise<Uint8Array>;
    /** Escapes text cells that look like formulas to prevent Excel formula injection. Enabled by default. */
    escapeFormulas?: boolean;
}
interface ExcelColumnDefinition {
    /** Stable programmatic key used to map row objects. Must be unique within a definition. */
    key: string;
    /** Visible worksheet header label. */
    name: string;
    /** Column width used for template/export rendering. */
    width?: number;
    /** Excel note/comment attached to the header cell. */
    note?: string;
    /**
     * Supported values:
     * - `text`
     * - `number`
     * - `date`
     * - `image`
     */
    dataType?: ExcelColumnDataType;
    /** Drop-down allowed values used for template validation and import expectations. */
    allowedValues?: string[];
    /** Parent header key for multi-row headers. Parent columns must be declared first. */
    parent?: string;
    /** Header background color in a CSS-like hex string such as `#RRGGBB`. */
    backgroundColor?: string;
    /** Header text color in a CSS-like hex string such as `#RRGGBB`. */
    color?: string;
    /** Whether the header text should be rendered bold. */
    bold?: boolean;
    /** Base format applied to cells in this column. */
    format?: ExcelCellFormatDefinition;
    /** Conditional or direct format overrides applied to exported cell values. */
    valueFormat?: ExcelCellFormatDefinition[] | ExcelCellFormatDefinition;
    /** Optional logical group identifier for nested export data. */
    dataGroup?: string;
    /** Optional parent group identifier. Referenced groups must be declared first. */
    dataGroupParent?: string;
}
interface ExcelCellFormatDefinition {
    rule?: 'default' | 'eq';
    value?: string;
    color?: string;
    bold?: boolean;
    italic?: boolean;
    underline?: boolean;
    strikethrough?: boolean;
    fontSize?: number;
    backgroundColor?: string;
    align?: 'left' | 'center' | 'right';
    alignVertical?: 'top' | 'center' | 'bottom';
    /** Excel-compatible number format string used for date display. */
    dateFormat?: string;
    borderColor?: string;
}
interface DynamicExcelImportOptions {
    /** Preferred worksheet name. Falls back to the first sheet when omitted or missing. */
    sheetName?: string;
    /** 1-based worksheet row number to use as the header row. Defaults to the first non-empty row. */
    headerRow?: number;
    /** Maximum upload size (in bytes) enforced for browser-based dynamic imports. Defaults to 25 MiB when omitted. */
    maxFileSizeBytes?: number;
}
interface DynamicExcelImportResult {
    /** Actual worksheet name that was imported. */
    sheetName: string;
    /** Header labels read from the worksheet in left-to-right order. */
    headers: string[];
    /** Row data keyed by the imported header labels. */
    rows: Record<string, string>[];
}
export { ExcelDefinition, ExcelColumnDefinition, ExcelCellFormatDefinition, ExcelColumnDataType, DynamicExcelImportOptions, DynamicExcelImportResult };