Kepler is a tool to generate ePub eBooks from Safari Books Online.
git clone https://github.com/Sneezry/Kepler.git- Open chrome://extensions/ in Chrome
- Enable developer mode
- Load unpackaged extension
- Select Kepler folder
- Open Safari Books Online and login your account
- Open the book you want to convert (such as https://www.safaribooksonline.com/library/view/learning-typescript/9781783985548/)
- Click Kepler icon on top right corner in your browser
- Wait and save ePub eBook
- Download and install Kindle Previewer
- Open the generated ePub file in Kindle Previewer
- Export mobi or azk file
- Import the file into Kindle
- Download KindleGen
./kindlegen <epub-file-name>
I haven't tested these projects, but just show them here in just case you may need them if this project cannot help you.