## Performance improvement
- [x] Performance improvement
Uses `fs.readdir`'s `withFileTypes` option, added in NodeJS version 10, to simultaneously read the target directories files and their stats, removing the need to call `fs.stat` on each of the files individually.
Similar to #27769, applies the same change to `recursiveCopy` and `recursiveDelete`.
* Run prettier over packages/**/*.js
* Run prettier over packages/**/*.ts
* Run prettier over examples
* Remove tslint
* Run prettier over examples
* Run prettier over all markdown files
* Run prettier over json files
* Remove client bundles for AMP pages
after build since they are not used
* Remove trailing white space
* Use async-sema to limit removing AMP client bundles
* Bring AMP client bundle removing
semaphore concurrency down to 20
* Don't check blocked pages when
deleting AMP client bundles
* Update client bundle removing for AMP pages
* Add error handling for removing client AMP pages
* rethrow error unless ENOENT during
deleting AMP client pages
* Handle error during removing AMP client
pages the same during dev
* Fix throwing instead of rejecting
* Make sure next/config is set before requiring page
* Update error check
* return on reject
* Fix next/config
