export declare const DEFAULT_LANGUAGE_MAPPER: {
    readonly ecmascript: 'js';
    readonly javascript: 'js';
    readonly javascriptreact: 'jsx';
    readonly typescript: 'ts';
    readonly typescriptreact: 'tsx';
    readonly markdown: 'md';
    readonly markdownjsx: 'mdx';
    readonly markdownreact: 'mdx';
    readonly mdown: 'md';
    readonly mkdn: 'md';
};
export declare function getShortLang(filename: string, languageMapper?: Record<string, string> | false): string;