fix(core): prevent duplicate plugins in standalone mode

[webfansplz]

Context

play:standalone resolves both the plugins declared in the playground Vite config and the plugins injected by the standalone launcher.

The previous deduplication only matched plugin names starting with vite:devtools. Devframe plugins and optional integrations use other names, so they could be initialized more than once, causing duplicate setup and RPC registrations.

Changes

• Resolve the standalone DevTools() plugins once and deduplicate using their exact plugin names.
• Preserve duplicate user plugins that are unrelated to the standalone injection.
• Remove the playground’s redundant manual mounts for built-in Devframe plugins.

[pkg-pr-new]

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@vitejs/devtools

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools@422

@vitejs/devtools-kit

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools-kit@422

@vitejs/devtools-oxc

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools-oxc@422

@vitejs/devtools-rolldown

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools-rolldown@422

@vitejs/devtools-vite

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools-vite@422

@vitejs/devtools-vitest

npm i https://pkg.pr.new/vitejs/devtools/@vitejs/devtools-vitest@422

commit: 1351d29

[Copilot]

Pull request overview

This PR fixes standalone-mode plugin initialization by deduplicating all plugins injected by DevTools() (not just those with the vite:devtools prefix), preventing duplicate setup/RPC registrations when the target project config also includes some of the same plugins.

Changes:

• Resolve standalone DevTools() plugins once and dedupe resolved Vite plugins by exact injected plugin names.
• Add unit tests for dedupeVitePlugins to ensure injected plugins are deduped while unrelated user duplicates are preserved.
• Remove redundant manual Devframe plugin mounts from the core playground config (since DevTools() already mounts them).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/node/standalone.ts	Resolves DevTools() once and dedupes injected plugins by exact names.
packages/core/src/node/tests/standalone.test.ts	Adds coverage for the new name-based dedupe behavior.
packages/core/playground/vite.config.ts	Removes redundant manual mounts for built-in Devframe plugins in the playground.

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[webfansplz]

Waiting for #423 to be merged.

[antfu]

I wonder maybe we should have all launcher and devframe plugins wrapped into a single Vite plugin instead of polluting the Vite plugins pipeline

EDIT: I made it in 3fbc896