/**
 * Browser download helper shared by every built-in and host-supplied exporter.
 *
 * One implementation rather than four: an exporter that hand-rolled its own
 * anchor click would be the place a leaked object URL or a missing
 * `revokeObjectURL` eventually appears. It is also SSR-safe — with no
 * `document` present the call is an inert no-op instead of a crash, matching how
 * the toast service behaves.
 *
 * @packageDocumentation
 */
/**
 * MIME types for the formats the core writes, so a browser and the OS both
 * recognise the download.
 */
export declare const EXPORT_MIME_TYPES: {
    readonly csv: "text/csv;charset=utf-8;";
    readonly json: "application/json;charset=utf-8;";
    readonly xlsx: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    readonly pdf: "application/pdf";
};
/**
 * Triggers a browser download of in-memory content.
 *
 * The object URL is revoked on the next macrotask rather than synchronously:
 * Safari cancels a download whose URL is revoked in the same tick as the click.
 *
 * @param content  - The payload. A `Blob` is used as-is; a string or buffer is
 *                   wrapped in one using `mimeType`.
 * @param fileName - Download name, extension included.
 * @param mimeType - MIME type used when `content` is not already a `Blob`.
 * @returns `true` when the download was dispatched, `false` in a DOM-less
 *          environment.
 */
export declare function downloadExportFile(content: Blob | string | ArrayBuffer | Uint8Array, fileName: string, mimeType?: string): boolean;
/**
 * Ensures a file name carries the right extension, without ever doubling it.
 *
 * `'employees'`, `'employees.xlsx'` and `'employees.XLSX'` all resolve to
 * `'employees.xlsx'`, so a host can be as explicit (or not) as it likes.
 *
 * @param fileName  - The requested name, with or without an extension.
 * @param extension - The extension to guarantee, without the leading dot.
 */
export declare function withExtension(fileName: string, extension: string): string;
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