Support for webpackPrefetch and webpackPreload

[jomaxx]

Is your feature request related to a problem? Please describe.
Hello, not a problem but a useful enhancement. Webpack has support for preloading and prefetching via magic comments. Currently html-webpack-plugin doesn't make any use of this.

Describe the solution you'd like
Add preloaded and prefetched bundles to the final html output.

Describe alternatives you've considered
The alternative is to do this as a post-build step.

Additional context
https://webpack.js.org/api/module-methods/#magic-comments

[jantimon]

I really like this idea and we almost integrated this feature.
Unfortunately the only way to access information about magic comments is using the api of webpack stats which is very slow and will slow down the compilation for everyone who does not require prefetch or preload tags.

If we can find a better solution I would be very happy to merge a pull request

[MIreland]

Would it make sense to have it available as a disabled-by-default option, so that those of us who would benefit from it could enable it on production builds?

[jantimon]

Great approach 👍

We have something very similar for html minification

[stale]

This issue had no activity for at least half a year. It's subject to automatic issue closing if there is no activity in the next 15 days.