* Update CI to only run on Node 10 and 12, add engines to package.json

* Update TypeScript target

* Remove Bublé as a transpilation option from tests (it is still needed in sourcemap tests)

* Remove minNodeVersion form tests

* Reformat package.json

* Create a separate chunk for watch mode via a dynamic import

* Bundle chokidar

* Handle conditional fsevents import

* Only run tests on Node 10 and 12 as we want to do this anyway and chokidar depends on utils.promisify

* Improve chunking

* Refactor and simplify watcher

* Make watcher a proper parameter

* Only unwatch and watch on Linux systems

* No longer run JS files through TypeScript for improved bundling performance

* Remove active deprecations

* Make inactive deprecations active

* Improve coverage

* Improve coverage

* Refine transformer

* Improve coverage

* Refactoring option normalization

* Improve coverage