message: chore: bump CI typescript version
  Closes
diff: @@ -58,11 +58,18 @@ jobs:
  - attach_workspace: *attach_options
  - run: npm run dtslint
  - typescript3:
  + # Ideally, this package should support typescript@next. However, in the past
  + # that hasn't always been possible and frequent problems with nightly
  + # TypeScript builds resulted in CI failures being deliberately ignored.
  + # Instead, we should aim to keep the TypeScript version specified here as
  + # high as possible, but it should be known to be good. That is, it should be
  + # the upper bound - the latest version of TypeScript that we can be confident
  + # we can support.
  + typescriptLatestSupported:
  <<: *defaults
  steps:
  - attach_workspace: *attach_options
  - - run: npm i --no-save typescript@3.5.*
  + - run: npm i --no-save typescript@3.7.2
  - run: npm run compile
  workflows:
  @@ -79,7 +86,7 @@ workflows:
  - dtslint:
  requires:
  - build
  - - typescript3:
  + - typescriptLatestSupported:
  requires:
  - lint
  - test
  