Running Jest Debug on Windows – SyntaxError: missing ) after argument list

I’m using NestJS and the regular tests works smooth even in my Windows machine. However, when I tried running the debugging mode tests, especially since I’m trying to debug a memory leak, I get this error:

basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
^^^^^^^ SyntaxError: missing ) after argument list

I traced some of the discussions in Github like this:

It looks like the issue is due to this command:

node node_modules/.bin/jest

What it does is it tries to run a script but since I’m in Windows, and the target script is a bash script, it doesn’t work. Running the Windows script jest.cmd doesn’t work either since they are invoked from node instead of from the command line interpreter.

I just changed the command to invoke the JS script instead.

node node_modules/jest/bin/jest.js

Works like charm!

Full command:

node --expose-gc --inspect-brk -r tsconfig-paths/register
 -r ts-node/register node_modules/jest/bin/jest.js
 --runInBand --logHeapUsage

That’s it!

2 thoughts on “Running Jest Debug on Windows – SyntaxError: missing ) after argument list”

  1. Thank you for this post, it turned out to be the right solution to my problem after hours of searching The internet!
    Keep the good work up,

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