Use next.js method for detecting webpack 5

[ScriptedAlchemy]

I noticed you opted towards unstable_webpack5 flag that's manually passed.

Just wanted some information on why we need a manual flag for this, the rest of next and patched community plugins / loaders use the require('webpack').version to determine if its WP5 automatically

[martpie]

require('webpack').version requires Webpack at runtime, and Webpack in not installed at production time with npm install --production and yarn install --production, as it is a dev dependencies.

So this is why you need to pass a flag, because require('webpack') would throw at runtime on production.

[martpie]

sidenote: It works for Next.js because they only use it at build time, and not at runtime (and next.config.js is executed also at runtime)

[ScriptedAlchemy]

Thanks! Was wondering 💭