feat(ssr): add import.meta.main support for Node.js module runner

[Copilot]

Implements import.meta.main property for Vite's module runner in Node.js environments. The property is only available when using createNodeImportMeta() and always returns false, following Node.js module runner semantics.

What it does

The import.meta.main property is added exclusively to the Node.js implementation:

• Available only in createNodeImportMeta()
• Always returns false (no dynamic main module detection)
• Not available in the default createDefaultImportMeta()

// When using createNodeImportMeta in Node.js module runner
console.log(import.meta.main) // false (always)

// When using createDefaultImportMeta  
console.log(import.meta.main) // undefined (property not available)

Implementation

• Added main: boolean property to ModuleRunnerImportMeta interface
• Enhanced createNodeImportMeta() to include main: false
• No changes to createDefaultImportMeta() - property remains unavailable there
• No main module tracking logic in ModuleRunner class

Testing

Added e2e test in playground/ssr that verifies import.meta.main returns false in the module runner environment. All existing tests continue to pass, ensuring no regressions.

Use cases

This provides consistency with Node.js module semantics while keeping the implementation simple and avoiding complex main module detection logic.

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• vite.dev
  • Triggering command: /home/REDACTED/.cache/playwright-bin/chromium_headless_shell-1181/chrome-linux/headless_shell --disable-field-trial-config --disable-REDACTED-networking --disable-REDACTED-timer-throttling --disable-REDACTEDing-occluded-windows --disable-back-forward-cache --disable-breakpad --disable-client-side-phishing-detection --disable-component-extensions-with-REDACTED-pages --disable-component-update --no-default-browser-check --disable-default-apps --disable-dev-shm-usage --disable-extensions --disable-features=AcceptCHFrame,AutoExpandDetailsElement,AvoidUnnecessaryBeforeUnloadCheckSync,CertificateTransparencyComponentUpdater,DestroyProfileOnBrowserClose,DialMediaRouteProvider,ExtensionManifestV2Disabled,GlobalMediaControls,HttpsUpgrades,ImprovedCookieControls,LazyFrameLoading,LensOverlay,MediaRouter,PaintHolding,ThirdPartyStoragePartitioning,Translate --allow-pre-commit-input --disable-hang-monitor --disable-ipc-flooding-protection --disable-popup-blocking --disable-prompt-on-repost --disable-renderer-REDACTEDing --force-color-profile=srgb --metrics-recording-only --no-first-run --password-store=basic --use-mock-keychain --no-service-autorun --export-tagged-pdf --disable-search-engine-choice-screen --unsafely-disable-devtools-self-xss-warnings --edge-skip-compat-layer-relaunch --enable-automation --headless --hide-scrollbars --mute-audio --blink-settings=primaryHoverType=2,availableHoverTypes=2,primaryPointerType=4,availablePointerTypes=4 --no-sandbox --no-sandbox --disable-setuid-sandbox --user-data-dir=/tmp/playwright_chromiumdev_profile-g2Jr6U --remote-debugging-pipe --no-startup-window (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• workers.cloudflare.com
  • Triggering command: node (vitest 2) (dns block)
  • Triggering command: node (vitest 1) (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[sapphi-red]

/ecosystem-ci run

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/vite@20517

commit: f2a2885

[vite-ecosystem-ci]

📝 Ran ecosystem CI on f2a2885: Open

suite	result	latest scheduled
vike	✅ success	❌ failure
vitest	❌ failure	❌ failure

✅ astro, analogjs, histoire, ladle, nuxt, laravel, one, marko, qwik, rakkas, quasar, sveltekit, react-router, storybook, vite-plugin-pwa, unocss, vite-plugin-react, vite-environment-examples, vite-plugin-vue, vite-plugin-svelte, vite-plugin-cloudflare, waku, vitepress, vite-plugin-rsc, vite-setup-catalogue, vuepress