fix: disable code splitting for optimized dependencies

[Methuselah96]

Description

Disables code splitting for optimized dependencies.
Fixes #12423.
Fixes #5142.

Additional context

The esbuild docs say that "code splitting is still a work in progress...with a known ordering issue" and is not "ready for use in production yet". The ordering issue has been around for several years with no end in sight.

It seems problematic to rely on a feature from esbuild that is known to have issues and therefore causes issues for the users of Vite.

See #12423 (comment) for more context.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[ArnaudBarre]

This would probably means that multiple version of the same lib get served, which is a no go for React.

[Methuselah96]

I created this more out of annoyance that Vite is repackaging a non-stable feature of esbuild and calling it stable. It's not a very constructive way for me to vent, I'm just a little frustrated to see Vite doing this and putting users in that situation. Since this is unlikely to go anywhere, I'll go ahead and close it. The ship has already left the harbour and there's no turning back now.

[ArnaudBarre]

Vite will not be where it is without esbuild & esbuild pre-bundling. No body for now has a stable fast bundler available.
And this issue is one the reason esbuild is not used for builds. If you have a something better than esbuild, we will be please to use it. Otherwise you can use webpack of anything else probably less stable than Vite.

[Methuselah96]

If it's not stable, then imo there should be a big disclaimer on the front page that says so, so that people who want stability don't have to waste their time. esbuild is stable, it's just the code splitting feature that is not stable.