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some of optionalDependencies dependencies are remvoved after prune

The problem is related with prune command. For production mode removes dependencies of optionalDependencies packages and app reports missing packages, related with packages under optionalDependencies.

Platform Info

$ npm --versions
{ WacomInkspaceApp: '2.6.1',
  npm: '6.4.1',
  ares: '1.14.0',
  cldr: '33.1',
  http_parser: '2.8.0',
  icu: '62.1',
  modules: '67',
  napi: '3',
  nghttp2: '1.34.0',
  node: '11.0.0',
  openssl: '1.1.0i \n',
  tz: '2018e',
  unicode: '11.0',
  uv: '1.23.2',
  v8: '7.0.276.28-node.5',
  zlib: '1.2.11' }
$ node -p process.platform
darwin