copilot-pull-request-reviewer is suddenly crashing when assigned to a PR

[perezd]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Copilot Code Review

Body

Here's what I am seeing:

Using default CAPI authentication (token)
[CLI subprocess] node:internal/modules/package_json_reader:301
[CLI subprocess]   throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
[CLI subprocess]         ^
[CLI subprocess] Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
[CLI subprocess]     at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
[CLI subprocess]     at packageResolve (node:internal/modules/esm/resolve:768:81)
[CLI subprocess]     at moduleResolve (node:internal/modules/esm/resolve:859:18)
[CLI subprocess]     at defaultResolve (node:internal/modules/esm/resolve:992:11)
[CLI subprocess]     at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
[CLI subprocess]     at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
[CLI subprocess]     at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
[CLI subprocess]     at #resolve (node:internal/modules/esm/loader:673:17)
[CLI subprocess]     at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
[CLI subprocess]     at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
[CLI subprocess]   code: 'ERR_MODULE_NOT_FOUND'
[CLI subprocess] }
[CLI subprocess] Node.js v24.16.0
Error creating PR review request: CLI server exited with code 1
Reporting error to sweagentd...
Copilot API POST /agents/swe/agent/jobs/274583492-1240178658-68a3de70-b224-444a-bd70-ae7eb16620ad/progress
stderr: node:internal/modules/package_json_reader:301
  throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
        ^
Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
    at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
    at packageResolve (node:internal/modules/esm/resolve:768:81)
    at moduleResolve (node:internal/modules/esm/resolve:859:18)
    at defaultResolve (node:internal/modules/esm/resolve:992:11)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
    at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
    at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
    at #resolve (node:internal/modules/esm/loader:673:17)
    at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
    at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
  code: 'ERR_MODULE_NOT_FOUND'
}
Node.js v24.16.0 (errorDetails: {"configurationError":false}, autofind.js version: 0.1.77)
Error successfully reported to sweagentd.
Error: CLI server exited with code 1
stderr: node:internal/modules/package_json_reader:301
  throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
        ^
Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
    at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
    at packageResolve (node:internal/modules/esm/resolve:768:81)
    at moduleResolve (node:internal/modules/esm/resolve:859:18)
    at defaultResolve (node:internal/modules/esm/resolve:992:11)
    at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
    at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
    at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
    at #resolve (node:internal/modules/esm/loader:673:17)
    at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
    at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
  code: 'ERR_MODULE_NOT_FOUND'
}
Node.js v24.16.0
    at Timeout._onTimeout (file:///home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/autofind.js:955:199)
    at listOnTimeout (node:internal/timers:605:17)
    at process.processTimers (node:internal/timers:541:7)

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[perezd]

This is effecting 100% of my PR review requests. It seems to be nearly immediate when it's boot up the agent review environment as a workflow. It never gets to my code.

[kbuchanan]

Seeing the exact same thing. 100% of review requests on my repo, started today.

Identical trace: Cannot find package 'detect-libc' from @github/copilot/npm-loader.js, ERR_MODULE_NOT_FOUND, Node v24.16.0, autofind.js v0.1.77. Crashes on startup before it touches the diff.

This lines up with code review moving onto Actions runners on June 1. Looks like the runner picked up Node 24 and the bundled action is missing detect-libc in its node_modules, which Node 24's stricter ESM loader then hard-fails on instead of resolving.

Nothing we can do from our side since it's all inside the managed ***-action-main dist. Needs a fix in the bundled action: either ship detect-libc as a dependency or pin the runner to Node 20.

[perezd]

Yeah, this started happening literally around 10:30AM PST for me, I had success until then.

[lovestosurf70]

Seeing the same thing, here is my output

Resolved repo directory: /home/runner/work/Sudoku/Sudoku
Running in CCA: true
[debug] Using copilot CLI path: /home/runner/work/_temp/-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
Using default CAPI authentication (token)
[CLI subprocess] node:internal/modules/package_json_reader:301
[CLI subprocess] throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
[CLI subprocess] ^
[CLI subprocess] Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
[CLI subprocess] at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
[CLI subprocess] at packageResolve (node:internal/modules/esm/resolve:768:81)
[CLI subprocess] at moduleResolve (node:internal/modules/esm/resolve:859:18)
[CLI subprocess] at defaultResolve (node:internal/modules/esm/resolve:992:11)
[CLI subprocess] at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
[CLI subprocess] at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
[CLI subprocess] at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
[CLI subprocess] at #resolve (node:internal/modules/esm/loader:673:17)
[CLI subprocess] at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
[CLI subprocess] at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
[CLI subprocess] code: 'ERR_MODULE_NOT_FOUND'
[CLI subprocess] }
[CLI subprocess] Node.js v24.16.0
Error creating PR review request: CLI server exited with code 1
Reporting error to sweagentd...
stderr: node:internal/modules/package_json_reader:301
throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
^

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
at packageResolve (node:internal/modules/esm/resolve:768:81)
at moduleResolve (node:internal/modules/esm/resolve:859:18)
at defaultResolve (node:internal/modules/esm/resolve:992:11)
at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
at #resolve (node:internal/modules/esm/loader:673:17)
at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
code: 'ERR_MODULE_NOT_FOUND'
}

Node.js v24.16.0 (errorDetails: {"configurationError":false}, autofind.js version: 0.1.77)
Copilot API POST /agents/swe/agent/jobs/182419340-1240199649-4b29e09b-e61f-4977-b2fa-09e674011c9d/progress
Error successfully reported to sweagentd.
Error: CLI server exited with code 1
stderr: node:internal/modules/package_json_reader:301
throw new ERR_MODULE_NOT_FOUND(packageName, fileURLToPath(base), null);
^

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'detect-libc' imported from /home/runner/work/_temp/***-action-main/dist-autofind-ts/ts/copilot-cli/node_modules/@github/copilot/npm-loader.js
at Object.getPackageJSONURL (node:internal/modules/package_json_reader:301:9)
at packageResolve (node:internal/modules/esm/resolve:768:81)
at moduleResolve (node:internal/modules/esm/resolve:859:18)
at defaultResolve (node:internal/modules/esm/resolve:992:11)
at #cachedDefaultResolve (node:internal/modules/esm/loader:691:20)
at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:708:38)
at ModuleLoader.resolveSync (node:internal/modules/esm/loader:740:52)
at #resolve (node:internal/modules/esm/loader:673:17)
at ModuleLoader.getOrCreateModuleJob (node:internal/modules/esm/loader:593:35)
at ModuleJob.syncLink (node:internal/modules/esm/module_job:163:33) {
code: 'ERR_MODULE_NOT_FOUND'
}

Node.js v24.16.0
at Timeout._onTimeout (file:///home/runner/work/_temp/-action-main/dist-autofind-ts/ts/autofind.js:955:199)
at listOnTimeout (node:internal/timers:605:17)
at process.processTimers (node:internal/timers:541:7)
::::
Error: The operation was canceled.

[roshhellwett]

Root cause is the Actions runner picked up Node 24 on June 1 — Node 24's stricter ESM loader hard-fails on detect-libc since it's not bundled in the managed ***-action-main dist.

Temporary workaround until GitHub patches it — force Node 20 in your workflow:

- uses: actions/setup-node@v4
  with:
    node-version: '20'

Add that step before the copilot reviewer action. Fixes it until they either bundle detect-libc properly or pin their runner back.

[perezd]

Do we own the workflow file somewhere? Where would that go?

[kbuchanan]

Depends on how you're using Copilot code review.

If you set it up as an automatic reviewer via repository settings (Settings → Copilot → Code review), there's no workflow file. GitHub manages the action entirely on their end. You have nothing to patch, and the setup-node workaround won't help. That's the case for most people hitting this bug.

If you instead trigger it explicitly in your own workflow, the file lives at .github/workflows/<whatever-you-named-it>.yml in your repo, and the setup-node fix applies there:

- uses: actions/setup-node@v4
  with:
    node-version: '20'
- uses: <copilot-review-action>   # your existing step

If you're not sure which setup you have: check Settings → Copilot in your repo. If Copilot is listed as an automatic reviewer there, you're in the first camp and just have to wait for GitHub to ship the fix.

[perezd]

ah ok, I use the manual request within the PR itself, so I guess that makes it semi-auto :P

[perezd]

OK it looks like it's working for me again now as of 12:27PM PST.