All done!

Or I think so. One thing I'm concious we're missing is our extra rule that enforces `.js` when requiring files. We were getting this from [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import) via StandardJS using the `'import/extensions': ['error', 'always']` rule in our old config.

neostandard does not currently include eslint-plugin-import or the rules StandardJS was using from it. This is because it didn't support ESLint's flat-file config [until recently](un-ts/eslint-plugin-import-x#122).

neostandard has a [PR open](neostandard/neostandard#197) that re-enables the 'import' rules. At which point we can piggy back again and add our extra 'import/extensions'.

Activity looks good so I'm inclined to go without in the short term and wait for the PR to be merged and neostandard to be updated.