refs https://github.com/TryGhost/DevOps/issues/50
- `react-app` comes from `eslint-config-react-app`, which is a CRA package
- we're moving away from that so this commit switches the linting over
to a more recently updated plugin
- once that was removed, we started using a newer version of
`@typescript-eslint/eslint-plugin`, so there were plenty of
updates/exemptions to make
refs: https://github.com/TryGhost/Toolbox/issues/595
We're rolling out new rules around the node assert library, the first of which is enforcing the use of assert/strict. This means we don't need to use the strict version of methods, as the standard version will work that way by default.
This caught some gotchas in our existing usage of assert where the lack of strict mode had unexpected results:
- Url matching needs to be done on `url.href` see aa58b354a4
- Null and undefined are not the same thing, there were a few cases of this being confused
- Particularly questionable changes in [PostExporter tests](c1a468744b) tracked [here](https://github.com/TryGhost/Team/issues/3505).
- A typo see eaac9c293a
Moving forward, using assert strict should help us to catch unexpected behaviour, particularly around nulls and undefineds during implementation.
