Source map doesn't analyze

[carpben]

Describe the bug

In a CRA3 typescript project, source-map-explorer fails to analyze parts of build/bundles, and displays them as null.
A few days ago, still using CRA2 it worked well.

Did you try recovering your dependencies?

Yes
npm --version : 6.13.0

Terms I searched for:

source-map-explorer typescript CRA Create-React-App 3 null

I am aware of #6994, but his solution requires ejecting.

Environment

System:
OS: Windows 10
CPU: x64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
Binaries:
Yarn: 1.9.2 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.13.0 - C:\Program Files\nodejs\npm.CMD
Browsers:
Edge: 44.18362.387.0
Internet Explorer: 11.0.18362.1
npmPackages:
react: ^16.8.6 => 16.11.0
react-dom: ^16.8.6 => 16.11.0
react-scripts: ^3.2.0 => 3.2.0
npmGlobalPackages:
create-react-app: Not Found

Steps to reproduce

1. CRA 3 --typescript project
2. In package.json

"scripts": {
    "analyze": "source-map-explorer build/js-bundles/*.js",
  },

3. npm run analyze

Actual behavior

(Write what happened. Please add screenshots!)

Expected behavior

Instead of null, display file names from source code.

[carpben]

A similar issue has been opened on source-map-explorer, and it seems a few users of CRA have been suffering from it after the release of CRA3 [link].

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

[stale]

This issue has been automatically closed because it has not had any recent activity. If you have a question or comment, please open a new issue.