Regression in 4.1.0-beta.4 in Yarn PnP mode, tests hanging indefinitely on Vite 8

Describe the bug

Using Yarn PnP and upgrading Vitest from 4.0.18 to 4.1.0-beta.6 (and Vite to 8.0.0-beta.16) my tests started hanging indefinitely. Upon inspection, this is what the logs showed:

(!) Failed to run dependency scan. Skipping dependency pre-bundling. Error: The following dependencies are imported but could not be resolved:

  @opentelemetry/api (imported by .yarn/__virtual__/vitest-virtual-e4efedcc9d/0/cache/vitest-npm-4.1.0-beta.6-795d1e89bc-7e355c49ce.zip/node_modules/vitest/dist/chunks/traces.CCmnQaNT.js)

Are they installed?
    at .yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:31099:33
    at .yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:23472:15
3:42:12 PM [vite] Internal server error: Failed to resolve import "@opentelemetry/api" from ".yarn/__virtual__/vitest-virtual-e4efedcc9d/0/cache/vitest-npm-4.1.0-beta.6-795d1e89bc-7e355c49ce.zip/node_modules/vitest/dist/chunks/traces.CCmnQaNT.js?v=1267b7c2". Does the file exist?
  Plugin: vite:import-analysis
  File: .yarn/__virtual__/vitest-virtual-e4efedcc9d/0/cache/vitest-npm-4.1.0-beta.6-795d1e89bc-7e355c49ce.zip/node_modules/vitest/dist/chunks/traces.CCmnQaNT.js?v=1267b7c2:15:26
  13 |          constructor(options) {
  14 |                  if (options.enabled) {
  15 |  ..."__vitest_browser_runner__"].wrapDynamicImport(() => import('@opentelemetry/api')).then((api) => {
     |                                                                 ^
  16 |                                  this.#otel = {
  17 |                                          tracer: api.trace.getTracer(options.tracerName || "vitest"),
      at TransformPluginContext._formatLog (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:30104:39)
      at TransformPluginContext.error (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:30101:14)
      at normalizeUrl (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27902:18)
      at .yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27965:30
      at async Promise.all (index 0)
      at TransformPluginContext.transform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27933:4)
      at EnvironmentPluginContainer.transform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:29893:14)
      at loadAndTransform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:24542:26)
3:42:12 PM [vite] Internal server error: Failed to resolve import "@opentelemetry/api" from ".yarn/__virtual__/vitest-virtual-e4efedcc9d/0/cache/vitest-npm-4.1.0-beta.6-795d1e89bc-7e355c49ce.zip/node_modules/vitest/dist/chunks/traces.CCmnQaNT.js?v=1267b7c2". Does the file exist?
  Plugin: vite:import-analysis
  File: .yarn/__virtual__/vitest-virtual-e4efedcc9d/0/cache/vitest-npm-4.1.0-beta.6-795d1e89bc-7e355c49ce.zip/node_modules/vitest/dist/chunks/traces.CCmnQaNT.js?v=1267b7c2:15:26
  13 |          constructor(options) {
  14 |                  if (options.enabled) {
  15 |  ..."__vitest_browser_runner__"].wrapDynamicImport(() => import('@opentelemetry/api')).then((api) => {
     |                                                                 ^
  16 |                                  this.#otel = {
  17 |                                          tracer: api.trace.getTracer(options.tracerName || "vitest"),
      at TransformPluginContext._formatLog (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:30104:39)
      at TransformPluginContext.error (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:30101:14)
      at normalizeUrl (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27902:18)
      at .yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27965:30
      at async Promise.all (index 0)
      at TransformPluginContext.transform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:27933:4)
      at EnvironmentPluginContainer.transform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:29893:14)
      at loadAndTransform (.yarn/__virtual__/vite-virtual-c28d10bf5b/0/cache/vite-npm-8.0.0-beta.16-d82505fa41-8f71a52d21.zip/node_modules/vite/dist/node/chunks/node.js:24542:26)

What's important is that I do NOT have openTelemetry enabled.

Setting pnpMode to loose does not help (as it usually does).

Installing @opentelemetry/api in the project does fix the issue, somewhat unsurprisingly.

I have tried other versions of Vitest and 4.1.0-beta.3 was the latest one that didn't have this error coming up in the logs.

Related PR: https://github.com/vitest-dev/vitest/pull/8994

Reproduction

I believe I have provided sufficient information for this bug to be resolved. If I'm mistaken, please let me know!

System Info

  System:
    OS: macOS 26.3
    CPU: (10) arm64 Apple M1 Max
    Memory: 834.45 MB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.11.1 - /usr/local/bin/node
    Yarn: 4.10.3 - /Users/wojciech.maj/.yarn/switch/bin/yarn
    npm: 11.6.2 - /usr/local/bin/npm
  Browsers:
    Chrome: 144.0.7559.134
    Firefox: 141.0.3
    Safari: 26.3

Used Package Manager

yarn

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

Reproduce the hang with Yarn 4 PnP using Vitest 4.1.0-beta.6 and Vite 8.0.0-beta.16, then inspect the logged vitest/dist/chunks/traces.CCmnQaNT.js path and the changes in related PR #8994. Done means tests no longer hang or fail to resolve @opentelemetry/api when OpenTelemetry is disabled and the dependency is not installed.