Framework: bump webpack to 3.10

[samouri]

Consult https://github.com/webpack/webpack/releases for a changelog.
Mostly bugfixes, treeshaking support to require.include, and some other minor changes.

I in particular am interested in this release because it includes a memory leak fix for the Scope Hoisting plugin.

to test
no extensive testing necessary. Just make sure you can still start up and click around in Calypso.

[samouri]

dserve link: https://dserve.a8c.com/?branch=update/webpack

[jsnajdr]

There are some very strange failures in the desktop build: it looks more like broken node_modules directory rather than a problem with this PR. Can you verify that?

Locally building CALYPSO_ENV=desktop npm run build always fails on missing electron package, both in this branch and in master, so I'm probably not building it right.

[dmsnell]

I'm suspicious that because we didn't update the webpack.shared.js file in wp-desktop that it's the source of these errors. maybe we just need to update as was done in https://github.com/Automattic/wp-calypso/pull/21349/files#diff-cb006786d97169a6aa9bff024064ecefR106

[jsnajdr]

Or it's a build failure unrelated to this PR. I just got exactly the same failure for an unrelated PR #21641.

[samouri]

The new sections-loader pr broke the desktop builds which is causing all of the canaries to fail.
I have a PR out now to fix it: Automattic/wp-desktop#405

Locally building CALYPSO_ENV=desktop npm run build always fails on missing electron package, both in this branch and in master, so I'm probably not building it right.

Has that ever worked? I've never tried it

[samouri]

@jsnajdr: I was just able to run CALYPSO_ENV=desktop npm run build with no errors in this branch :/