message: chore(compiler): improve performance for language service
diff: @@ -27,6 +27,7 @@ export const compileUsingLanguageService = (
  call: null,
  [LogContexts.logLevel]: LogLevels.trace,
  }
  + let projectVersion = 1
  // Set the file contents into cache.
  const updateMemoryCache = (code: string, fileName: string) => {
  logger.debug({ fileName }, `updateMemoryCache(): update memory cache for language service`)
  @@ -38,10 +39,13 @@ export const compileUsingLanguageService = (
  }
  if (memoryCache.contents[fileName] !== code) {
  memoryCache.contents[fileName] = code
  - memoryCache.versions[fileName] = (memoryCache.versions[fileName] || 0) + 1
  + memoryCache.versions[fileName] = fileVersion + 1
  + // Increment project version for every file change.
  + projectVersion++
  }
  }
  const serviceHost: _ts.LanguageServiceHost = {
  + getProjectVersion: () => String(projectVersion),
  getScriptFileNames: () => Object.keys(memoryCache.versions),
  getScriptVersion: (fileName: string) => {
  const normalizedFileName = normalize(fileName),
  