* origin/master: (28 commits)
  LEGO: check in for master to temporary branch.
  LEGO: check in for master to temporary branch.
  Removes redundant comments (microsoft#20214)
  Catch illegal jsdoc tags on constructors (microsoft#20045)
  Use stricter types for event bodies
  Use {} instead of any to improve type checking
  Update public API baseline
  Update project on PackageInstalledResponse
  Unswap arguments
  LEGO: check in for master to temporary branch.
  Fix visibility checking of mutually recursive exports (microsoft#19929)
  Add dt baseline folder to gitignore (microsoft#20205)
  Support getJSDocCommentsAndTags for special property assignments (microsoft#20193)
  Clean up outliningElementsCollector (microsoft#20143)
  Correct project root path passed to Typings Installer
  Check hasOwnProperty before copying property
  Convert legacy safe list keys to lowercase on construction
  Port generated lib files (microsoft#20177)
  Clean up lexical classifier (microsoft#20123)
  Allow curly around `@type` jsdoc to be optional (microsoft#20074)
  ...