The possibility to create issue or pull request templates in GitHub is nothing new. However it is also possible to create multiple templates and offer a nice view to the user that lets him choose a suitable template before creating a new issue.
To do this, create a new file .github/ISSUE_TEMPLATE/bug.md:
---
name: Bug report
about: Create a new bug report
---
Template goes here.
The name and about attributes will be shown to the user before he creates a new issue. If you want some more issue templates just create new files in this directory. At the end it could look like the issue template chooser of facebook/jest:
They have 4 different templates and if nothing seems to fit for your issue you can still choose to have no template. You can try it out on Jests GitHub page. Create a new issue (but don’t submit it) to see how the template choosing works.
The same is possible for pull requests, however there isn’t a nice page offering the templates and instead it seems you have to use it as a query string in the url by adding:
?quick_pull=1&template=bug.md to use the template at .github/PULL_REQUEST_TEMPLATE/bug.md