Create React App (TypeScript) auto-generating react-app-env.d.ts in src directory

Question

Context:

I just ported one app from create-react-app-typescript to create-react-app. In a identically structured but different app, I did the same steps.

Steps:

npm uninstall react-scripts-ts
npm install react-scripts
npm install --save typescript @types/node @types/react @types/react-dom @types/jest

Detailed Steps

Problems unique to second app:

• Type error: Cannot compile namespaces when the '--isolatedModules' flag is provided. TS1208
• Generated file src/react-app-env.d.ts

Assumption:

The generated file src/react-app-env.d.ts causes the --isolatedModules error.

Actual Question:

How do I prevent react-scripts from generating the src/react-app-env.d.ts file upon react-scripts start?

Answer 1

Useful info:

As expected there was an empty file causing an issue, but it was not the generated src/react-app-env.d.ts file.

Personal context:

An automated watch script copied an empty file into the problem project. The automated scripts never clean the destination, so the empty file hung around and later caused this issue.

Actual answer:

Make sure there are no empty (.ts) files.

While this is the actual answer in the sense that it solved my problem, I still don't know why one project generates a src/react-app-env.d.ts file while the other does not.