export declare const PLAIN_TEXT = "text/plain";
export declare const TEXT_COMMA_SEPARATED_VALUES = "text/csv";
export declare const TEXT_TAB_SEPARATED_VALUES = "text/tab-separated-values";
export declare const APPLICATION_OCTET_STREAM = "application/octet-stream";
export declare function isRecognizedCodeFileName(fileName: string): boolean;
/**
 * Given an initial Content Type and a file name, returns an appropriate Content
 * Type if the initial value is null or empty. Otherwise, the original Content
 * Type is returned.
 * @param type
 * @param fileName
 */
export declare function fixDefaultContentType(type: string | null, fileName: string): string;
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