- vitest and all test types etc (test pass). Needed a few minor changes
to match new behaviour of `expect().toMatchSnapshot` (trailing
whitespace is now important)
- `which` - read the changes and spot-checked it. They dropped <v18
- `webpack-cli` - changes don't affect our usage. Checked with a local
`webpack` build and a "prod" run (`make` no dev)
- `enhanced-ms` - checked and updated to use new functionality
- `typescript` - all tests pass, no warnings.
Tested the site locally too.
