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export const fileExists = async (filename: string): Promise<boolean> => {    try {        await Deno.stat(filename);        // successful, file or directory must exist        return true;    } catch (error) {        if (error instanceof Deno.errors.NotFound) {            // file or directory does not exist            return false;        } else {            // unexpected error, maybe permissions, pass it along            throw error;        }    }};