/**
 * ExternalLinkXform — read and write `xl/externalLinks/externalLinkN.xml`.
 *
 * This part describes one external workbook referenced by the current file:
 * the list of sheets inside the foreign workbook, plus an optional cache of
 * the primitive values at each referenced address. The `r:id` attribute on
 * `<externalBook>` points (via the neighbouring `_rels/externalLinkN.xml.rels`)
 * at the actual file; that resolution is handled by the writer/reader in
 * `xlsx.browser.ts`, not here.
 *
 * Schema shape:
 *
 *   <externalLink xmlns=".../spreadsheetml/2006/main"
 *                 xmlns:r=".../relationships">
 *     <externalBook r:id="rId1">
 *       <sheetNames>
 *         <sheetName val="Sheet1"/>
 *         <sheetName val="Sheet2"/>
 *       </sheetNames>
 *       <sheetDataSet>
 *         <sheetData sheetId="0">                (0-based index into sheetNames)
 *           <row r="1">
 *             <cell r="A1" t="n"><v>123</v></cell>
 *             <cell r="B1" t="str"><v>hello</v></cell>
 *           </row>
 *           <row r="2">
 *             <cell r="A2" t="b"><v>1</v></cell>
 *           </row>
 *         </sheetData>
 *         <sheetData sheetId="1" refreshError="1"/>   (no cached values)
 *       </sheetDataSet>
 *     </externalBook>
 *   </externalLink>
 *
 * The `t` attribute on `<cell>` mirrors the inline-value types used inside a
 * worksheet's `<c>` element: "n" (number, default), "str" (string), "b"
 * (boolean), "e" (error). We don't emit shared-string indices here because
 * the externalLink part is self-contained — each cached string is serialised
 * inline as plain text inside `<v>`.
 *
 * Parser state machine:
 *   externalLink → externalBook → sheetNames → sheetName  (stores names in order)
 *                            \→ sheetDataSet → sheetData → row → cell → v  (values)
 *
 * The parser tolerates missing cache data (Excel's `refreshError="1"` mode);
 * sheets without a matching `<sheetData>` simply have no entry in
 * `cachedValues`.
 */
import type { ExternalLinkCachedSheet, ExternalLinkModel } from "../../../workbook.browser.js";
import { BaseXform } from "../base-xform.js";
import type { XmlSink } from "../../../../xml/types.js";
/**
 * Parsed shape of a single externalLinkN.xml part. Callers (xlsx.browser.ts)
 * merge `rId` with the matching `workbookRels` entry to recover the model's
 * `target` / `targetMode`, since those live in the sibling `.rels` file.
 */
export interface ParsedExternalLink {
    /** r:id on <externalBook>. Points at the rel inside externalLinkN.xml.rels. */
    externalBookRId: string;
    sheetNames: string[];
    cachedValues: Record<string, ExternalLinkCachedSheet>;
}
declare class ExternalLinkXform extends BaseXform<ParsedExternalLink> {
    /** Sheet name indexed by sheetId (0-based) — filled during parse. */
    private sheetNamesByIndex;
    /** Current sheet's accumulated cached cells. */
    private currentSheetCells;
    /** Current sheet's name (looked up from sheetId). */
    private currentSheetName;
    /** Current cell being parsed: address + type. */
    private currentCellAddress;
    private currentCellType;
    /** Accumulated text content of the current <v> element. */
    private currentCellValue;
    /** Which element we're currently inside. */
    private inV;
    get tag(): string;
    reset(): void;
    render(xmlStream: XmlSink, model: ExternalLinkModel): void;
    parseOpen(node: any): boolean;
    parseText(text: string): void;
    parseClose(name: string): boolean;
}
export { ExternalLinkXform };