@promptbook/legacy-documents/esm/src/utils/files/getFileExtension.d.ts

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import type { string_filename } from '../../types/string_filename';
import type { string_mime_type } from '../../types/string_mime_type';
/**
 * Get the file extension from a file name
 *
 * @private within the repository
 */
export declare function getFileExtension(value: string_filename): string_mime_type | null;