Fix #60479 - Change the behavior of tsc on a tsconfig solution

[RyanMyrvold]

Fix #60479 Diagnostic warning for tsc --noEmit when using solution-style tsconfig.json

Summary

This PR adds a diagnostic warning when tsc is run with --noEmit in a solution-style setup where tsconfig.json has:

• noEmit set to true
• An empty files array
• Project references defined

Context

The motivation for this change is to help users avoid a common point of confusion. With this configuration, many users expect tsc to handle project references, but --noEmit prevents any output, and until now, tsc hasn’t shown any guidance. The new warning suggests using tsc -b, which is the recommended command for managing builds with project references.

Changes Made

1. New Diagnostic Message: Adds a warning when noEmit is set to true with files: [] and references defined, suggesting the use of tsc -b.

   • Message: "Detected an empty 'files' array with project 'references'. Consider using 'tsc -b' for correct handling of project references."

2. Files Updated:

   • commandLineParser.ts: Adds logic to check for the misconfiguration and issue the new diagnostic.
   • diagnosticMessages.json: Adds the new diagnostic message.

Example

For a setup like this:

{
    "compilerOptions": {
        "noEmit": true
    },
    "files": [],
    "references": [
        { "path": "./lib" }
    ]
}

Running tsc --noEmit will now output the following warning:

Detected an empty 'files' array with project 'references'. Consider using 'tsc -b' for correct handling of project references.

[RyanMyrvold]

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