npm 7 support

[benmccann]

From RobotWizard on Discord:

npm init svelte@next followed by npm install is broken on npm 7. Need to do npm install --legacy-peer-deps because SvelteKit pulls in an old version of postcss. It's pulled in via Snowpack's usage of css-modules-loader-core, which is a library that looks like it hasn't been touched in a few years. It seems @lukeed was giving this a look at some point: css-modules/css-modules-loader-core#231. The fix might be for Snowpack to use postcss directly and stop using it through css-modules-loader-core. Or for Snowpack to stop using postcss altogether since I'm not really sure why it should necessarily be required

[benmccann]

Some discussion on this here: FredKSchott/snowpack#1410

[FredKSchott]

Bah, that's annoying. I'm actually about to update our CSS Modules support in Snowpack anyway, will take a look at fixing this issue at the same time. Appreciate the ping!

[FredKSchott]

Fix added to Snowpack: FredKSchott/snowpack#1666

[benmccann]

thanks @FredKSchott !!