* Moved server/lib/utils.js to Typescript
* moved _app.js to Typescript
* Moved _error.js to Typescript
* Added argument for custom props in _app and _error
* Moved _document.js to Typescript
* updated one test
* Updated types and added a validation for _document props
* Improved types
* Fixed some types
* Updated AppType
* Fixed some tests
* Added missing import
* Removed a not very useful type
* Fix missing type
* Move @types/styled-jsx
* Fix typescript errors
- Replaces taskr-babel with taskr-typescript for the `next` package
- Makes sure Node 8+ is used, no unneeded transpilation
- Compile Next.js client side files through babel the same way pages are
- Compile Next.js client side files to esmodules, not commonjs, so that tree shaking works.
- Move error-debug.js out of next-server as it's only used/require in development
- Drop ansi-html as dependency from next-server
- Make next/link esmodule (for tree-shaking)
- Make next/router esmodule (for tree-shaking)
- add typescript compilation to next-server
- Remove last remains of Flow
- Move hoist-non-react-statics to next, out of next-server
- Move htmlescape to next, out of next-server
- Remove runtime-corejs2 from next-server
