Nodemon not reloading. What's wrong with this nodemon.json file

This is my nodemon.json

{ 
    "watch": ["src/**/*.ts"],
    "exec": "node out/index.js" 
}

I run the nodemon by executing:

nodemon

In root nodejs directory

This is output:

 % nodemon                                                                                                     
[nodemon] 1.11.0                                                                                
[nodemon] to restart at any time, enter `rs`                                                                                                                       
[nodemon] watching: src/**/*.ts                                                                                                                       
[nodemon] starting node out/index.js
Yay! Started app!

But when I edit any ts file in src nodemon doesn't restart the app.

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