If youre a chad, then you forked the template repo and ran the bootstrap.ps1 meaning you alread have the upstream branch.
Otherwise you gonna have to run these powershell commands
If you cloned the repo via sourcetree then youre screwed, cant help you; you might as well quit now.
Now merge in the upstream branch to add the doc gen code
$matches = git remote -v | Select-String -Pattern 'https://(.+)/(.+?)\.git'
$upstream = 'https://' + $matches.Matches.groups[1] + '/npm-package-template.git'
git remote add upstream $upstream
echo "Added remote $upstream"
git fetch upstream
Add the libs and update typescript
git fetch upstream
git merge upstream/master
Now you should get fully sick auotmatic doc generation
yarn add -D typescript typedoc
https://typedoc.org/guides/doccomments/