feat(core): vite integration plugin & environments config

[webfansplz]

Be related to #296 (comment) and vitejs/vite#22312

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commit: 589ba8e

[Copilot]

Pull request overview

Adds a new public “integration” entrypoint to @vitejs/devtools intended to integrate DevTools into Vite’s build flow (and enable Rolldown devtools output), alongside a small refactor of DevTools config normalization.

Changes:

• Add ./integration package export + new src/integration.ts entry for consumers.
• Introduce DevToolsIntegration() Vite plugin (build-only) to enable build.rolldownOptions.devtools and start DevTools.
• Add resolveDevToolsConfig() (and deprecate normalizeDevToolsConfig()) to normalize/merge DevTools config inputs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/core/tsdown.config.ts	Adds build entry for the new integration entrypoint.
packages/core/src/node/plugins/integration.ts	New Vite plugin that enables Rolldown devtools options and starts DevTools during build.
packages/core/src/node/config.ts	Adds resolveDevToolsConfig() + host normalization helper; deprecates old normalizer.
packages/core/src/integration.ts	New public re-export entrypoint for the integration plugin.
packages/core/package.json	Exposes ./integration in the package exports map.

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