"Move to new file" edits files in tsconfig.json

[OliverJAsh]

TypeScript Version: 3.7.x-dev.201xxxxx

Search Terms:

Code

tsconfig.json:

{
    "files": ["src/main.ts"]
}

src/main.ts:

import { foo } from './foo';

const bar = 1;

console.log(foo, bar);

src/foo.ts:

export const foo = 1;

1. In src/main.ts, select the line const bar = 1;
2. Run the "move to new file" command

Expected behavior:

1. The code is moved to a new file and imported in src/main.ts
2. tsconfig.json should not be edited

Actual behavior:

1. The code is moved to a new file and imported in src/main.ts:

   import { foo } from './foo';
   import { bar } from './bar';
   
   console.log(foo, bar);

2. The new file is added to files in tsconfig.json:

   {
       "files": ["src/main.ts", "./src/bar.ts"]
   }

Playground Link:

Related Issues: #24857 (comment)

[RyanCavanaugh]

This is considered desirable behavior because if you have composite on, listing all the files is mandatory if you're using a files array