fs.readFile(languageServerArtifactFile, (err, data) => {
   if (err) throw err
   else {
     const languageServerArtifact = data.toString().trim()
     const languageServerVersion = languageServerArtifact.split(":")[2]
     const isOldServer = compareVersions(languageServerVersion, "0.9.x") <= 0
     fetchWithCoursier(coursierPath, languageServerArtifact).then((languageServerClasspath) => {
       run({
         command: "java",
         args: ["-classpath", languageServerClasspath, "dotty.tools.languageserver.Main", "-stdio"]
       }, isOldServer)
     })
   }
 })

 (a, b) =>
   compareVersions(ts.versionMajorMinor, b) < 0 &&
   compareVersions(a, b) <= 0
     ? b
     : a,