fix: support multiline new URL(..., import.meta.url) expressions

[Copilot]

Fixes #20631

Problem

Starting with Vite 7.1.0, assets referenced via multiline new URL(..., import.meta.url) expressions were not being bundled correctly. This regression was introduced in #20358 when hook filters were added to internal plugins.

The issue occurs when code is formatted with newlines:

// This works ✅
const workerUrl = new URL('worker.js', import.meta.url)

// This was broken ❌ (asset not bundled)
const workerUrl = new URL(
  'worker.js',
  import.meta.url
)

Root Cause

The regex filter in assetImportMetaUrlPlugin was using /new\s+URL.+import\.meta\.url/ which doesn't match across newlines because the . quantifier doesn't match newline characters by default.

Solution

Added the s flag (dotAll) to the regex pattern: /new\s+URL.+import\.meta\.url/s

This makes the . character match newlines, allowing the filter to correctly detect multiline new URL(..., import.meta.url) expressions.

Changes

• Fixed regex filter in packages/vite/src/node/plugins/assetImportMetaUrl.ts
• Added E2E test in playground/assets with separate test file to verify multiline expressions are correctly bundled

Verification

Manual testing confirms that both expressions now work identically:

// Both generate the same bundled output
const singleLine = new URL('./worker.js', import.meta.url)
const multiLine = new URL(
  './worker.js', 
  import.meta.url
)

The test includes a separate multiline-import-meta-url.js file to specifically verify that multiline expressions are detected by the regex filter and properly bundled as assets.

Fixes the specific issue mentioned in #20631 where pdfjs-dist worker assets were not being bundled when using multiline syntax.

---

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[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 (expand for details)

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,AutoDeElevate --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-m3HxaP --remote-debugging-pipe --no-startup-window (dns block)
  • 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,AutoDeElevate --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-kbGNt4 --remote-debugging-pipe --no-startup-window (dns block)
• workers.cloudflare.com

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
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