Jest Node Debugger Example Repo

I am trying to use the debugger but I can't get it to work. This minimal sample repo shows how I set up my project.

Setup

1. Use basic tsconfig.json file.
2. Install stuff from npm (npm i --save-dev typescript jest babel-jest @babel/core @babel/preset-env @babel/preset-typescript @jest/globals).
3. Create babel.config.js as recommended.
4. Create a basic file (run.ts).
5. Create a test file (run.test.ts).

Run WITHOUT Jest

1. Open Google Chrome and go to chrome://inspect/#devices.
2. Click on "Open dedicated DevTools for Node".
3. Run the program with node --inspect-brk run.ts
4. Wait a few seconds
5. Boom, the debugger window picks up the code and everything is good to go.

Run WITH Jest

1. Same as above, but run node --inspect-brk ./node_modules/jest/bin/jest.js --runInBand instead.
2. The debugger attaches, but none of the source code is there.
3. Now what?

Note that the only file picked up in the left-hand side is jest.js. The debugger does not know about any of my source files.

I also tried adding --require ts-node/register to the command (after npm i --save-dev ts-node). After that, it picks up a bunch of files in node_modules, but none of my actual source files.

I also added "soruceMap": true to my tsconfig.json, but that didn't seem to have any effect.

Notes

Here is a Stack Overflow question that I asked about this, with no response and 1 close vote as of 02/09/26.

Here is a GitHub issue that I opened against Jest about this.