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nodemon crashes when --help is redirected to a file #1807

khardix opened this issue Dec 7, 2020 · 2 comments · Fixed by #1825, Xenfo/maintainer#157, elirehema/pcapi#23, elirehema/real-estate#34 or zorko-io/zorko-platform#267


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khardix commented Dec 7, 2020

  • nodemon -v: master: 3d2320f
  • node -v: v14.14.0
  • Operating system/terminal environment: Fedora 33 (Linux), ZSH
  • Command you ran: node bin/nodemon.js --help >help.log

Expected behaviour

No output; help.log contains the help message.

Actual behaviour

$ node bin/nodemon.js --help >help.log
    process.stdout._handle.setBlocking(true); // nodejs/node#6456

TypeError: Cannot read property 'setBlocking' of undefined
    at nodemon (/home/.../nodemon/lib/nodemon.js:42:28)
    at Object.<anonymous> (/home/.../nodemon/bin/nodemon.js:7:1)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47

Steps to reproduce

Run the command with the redirect.


The following patch seems to fix the issue; however, since I did not yet dedicated enough time to understand the test suite (I'm not a JavaScript developer), I was unable to add appropriate tests for it. That is also the reason I'm submitting this as a bug report rather than a pull request.

diff --git a/lib/nodemon.js b/lib/nodemon.js
index b3badea..ce649cb 100644
--- a/lib/nodemon.js
+++ b/lib/nodemon.js
@@ -39,7 +39,9 @@ function nodemon(settings) {
   if ( {
-    process.stdout._handle.setBlocking(true); // nodejs/node#6456
+    if (process.stdout.isTTY) {
+      process.stdout._handle.setBlocking(true); // nodejs/node#6456
+    }
     if (!config.required) {
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stale bot commented Dec 25, 2020

This issue has been automatically marked as idle and stale because it hasn't had any recent activity. It will be automtically closed if no further activity occurs. If you think this is wrong, or the problem still persists, just pop a reply in the comments and @remy will (try!) to follow up.
Thank you for contributing <3

@stale stale bot added the stale no activity for 2 weeks label Dec 25, 2020
@remy remy removed the stale no activity for 2 weeks label Jan 6, 2021
remy added a commit that referenced this issue Jan 6, 2021
Fixes: #1807

Allows for nodemon --help > help.txt
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remy commented Jan 6, 2021

@khardix that fix was on point - and doesn't really need a test to go along side as it doesn't affect core running. I've got a PR (bit late) but it'll go live today.

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