fix: make the project run and compile

[belaczek]

Hi, I saw your PR seek-oss#218 and decides to try moving it forward a bit.

• type and lint errors should be all fixed
• webpack-dev-server was downgraded back to v3 as this version is already compatible with webpack 5. The v4 doesn't seem to be ready yet

I tried to run various scripts and all seem to be ok.

[loliver]

Thanks for looking at this, is webpack-dev-server@4.x.x not needed for webpack@5.x.x? It's obviously been awhile since I've been tinkering with this so can't remember what order I tried various things in. Apologies for the delay in reply, we don't have any urgent reason to get Webpack 5 in to production and the areas I'm using it in are all for component documentation for our design system so are not high priority.

[belaczek]

Hi, no worries. Yes, webpack-dev-server@3 is fully compatible with webpack@5. The v4 of dev server is still in beta.
I think it would make sense to merge my changes into your branch to make sure your PR passes lint checks and somebody else then could continue from that point.
In meantime, I have re-published my own webpack@5 compatible version of the playroom package so I'm currently also not in any urgency pushing the PR forward.

[loliver]

Oh great, I think the lack of node 8 compatibility was a sticking point that contributed to me giving up at the time.