Tsc in watch mode does not seem to observe changes when compiler errors due to project references are fixed

[ThomasKiesel]

TscBugOutdatedErrors.zip

TypeScript Version: 3.2.0-dev.20181010

**Search Terms: watch project reference **

Please find attached a folder with some files to reproduce the Problem.
The folder contains two subfolders:

1. A folder 'library' with an typescript file and a simple tsconfig.json
2. A folder 'app' with an typescript file and a tsconfig.json, referencing the library Project.

For observing the bug, please open a command prompt and navigate to the root Folder.

1. From command line, run "tsc -v --watch App" to transpile the files. Initially, there are no errors.
2. Edit Library\Library.ts: Rename the property 'message" of 'SomeObject' to 'message1' in the interface declaration as well as in the method 'createSomeObject()'. Save the file. The compiler reports an error in App/app.ts stating that the property 'message' cannot be found. This is correct.
3. Undo the changes from step 2, i.e. replace 'message1' by 'message' in both occurences and save the file.
   Expected behavior:
   Now I expect no errors.

Actual behavior:
However, the error message from step 2 still remains, as if the compiler did not notice the changes.

If I kill the watch process and restart the compiler again, everything is fine.

[sheetalkamat]

@ThomasKiesel are you using tsc -b or tsc -p to build the project? I tried with tsc -b since you used -v flag I assumed that what you want.. I cant repro this at all. I was able to see the addition of error when I renamed library message, and removal when I did undo of the change.

Also note that with both of these I am getting errors:

pp/app.ts:5:1 - error TS2584: Cannot find name 'console'. Do you need to change your target library? Try changing the `lib` compiler option to include 'dom'.

5 console.log("SomeObject says: " + createSomeObject().message);
  ~~~~~~~

App/app.ts:6:1 - error TS2304: Cannot find name 'setTimeout'.

6 setTimeout(function (){}, 3000);
  ~~~~~~~~~~

Can you copy paste the logs from --v that you get. May be that can give idea as to what might be going wrong.

[ThomasKiesel]

TscBugOutdatedErrors.zip
I have to apologize for submitting insufficient information. I had some trouble with sending the zip-archive and reduced the content to upload it, obviously it was not enough.

Please find attached the full zip file. Here you find an additional folder “node_modules”, containing the node type definitions and the typescript compiler which I used.

I run the command “node_modules.bin\tsc -b --watch App” in the root folder. “App” is the target project to compile.
After step 2, the output is as follows:

_App/app.ts:5:54 - error TS2551: Property 'message' does not exist on type 'SomeObject'. Did you mean 'message1'?

5 console.log("SomeObject says: " + createSomeObject().message);
                                                       ~~~~~~~

  Library/library.d.ts:2:5
    2     message1: string;
          ~~~~~~~~
    'message1' is declared here.

[19:41:18] Found 1 error. Watching for file changes._

After step 3, these messages disappear for a moment, just to return again:

__App/app.ts:5:54 - error TS2551: Property 'message' does not exist on type 'SomeObject'. Did you mean 'message1'?

5 console.log("SomeObject says: " + createSomeObject().message);
                                                       ~~~~~~~

  Library/library.d.ts:2:5
    2     message1: string;
          ~~~~~~~~
    'message1' is declared here._

[19:42:45] Found 1 error. Watching for file changes._`