message: Pin to 6.0.65 to fix build in short term.
  Fixes
  A recent change to broke some interface compatibility relating to our usage of streams with gulpif (https://github.com/DefinitelyTyped/DefinitelyTyped/commit/915a86f88bc2aad2e1dd59e2fea5edb1603c3cd7#diff-8811b50169fd98160ad78b073b4d0163). Not sure yet what the underlying issue is, so this pins to the version we know works for now.
diff: },
  "devDependencies": {
  "@types/fs-extra": "0.0.37",
  - "@types/node": "^6",
  + "@types/node": "=6.0.65",
  "@polymer/tools-common": "^1.0.1",
  "chai": "^3.5.0",
  "clang-format": "=1.0.48",
  