I'm trying to find the documentation for ReactJS LTS (long-term support), including duration and the versions currently supported. I've reviewed their website (https://reactjs.org/docs/faq-versioning.html) and versioning (https://reactjs.org/versions/) but I can't find a clear definition. Any help would be greatly appreciated.
According to this Github issue comment from Feb 24, 2019, their policy on support is the following:
Once a new major is released, we generally stop releasing new fixes for a previous major. The only exception is absolutely critical bugs (including security vulnerabilities).