VSCode debugger not working in Jest tests

Question

I'm struggling to get the Visual Studio Code debugger working in with Jest tests.

Here is my launch.json:

{
  "version": "0.2.0",
  "configurations": [
    {
      "type": "node",
      "request": "launch",
      "name": "Jest All",
      "program": "${workspaceFolder}/node_modules/jest/bin/jest",
      "args": ["--runInBand"],
      "console": "integratedTerminal",
      "internalConsoleOptions": "neverOpen",
      "sourceMaps": true
    }
  ]
}

Here are my Jest tests with a couple of breakpoints:

When I hit the green play button to run the tests with the debugger, the breakpoints are never hit.

Any help would be appreciated

Answer 1

Personnally I use this configuration

{
  "name": "Launch e2e test",
  "type": "node",
  "request": "launch",
  "env": {
    "NODE_ENV": "test"
  },
  "args": [
    "--colors",
    "--config=${workspaceFolder}/jest-e2e.config.js",
    "--runInBand",
    "--coverage"
  ],
  "runtimeArgs": [
    "--nolazy"
  ],
  "windows": {
    "program": "${workspaceFolder}/node_modules/jest/bin/jest",
  },
  "outputCapture": "std",
  "internalConsoleOptions": "openOnSessionStart"
}

Change jest-e2e.config.js by your configuration file. And remove or keep coverage

Like Laura Slocum said you will certainly have problem with line number. In my case personnaly think that the problem come from the jest configuration, the transform :

  transform: {
    "^.+\\.(t|j)s$": "ts-jest"
  },