`tsc --build --clean` unexpectedly deletes JavaScript files when `noEmit` is enabled if `outDir` is not set

[RA80533]

Bug Report

🔎 Search Terms

--build, build, --clean, clean, composite, noEmit, outDir

🕗 Version & Regression Information

• Version 4.2.3
• Version 4.3.0-dev.20210306 via typescript@next

💻 Code

$ touch index.js

{
  "compilerOptions": {
    "allowJs": true,
    "checkJs": true,
    "composite": true,
    "noEmit": true
  },
  "files": [
    "index.js"
  ]
}

• Although checkJs implies allowJs, both were included in the snippet for the purpose of clarity.
• While the bug occurs in non-composite projects, the composite property was included in the snippet to demonstrate a likely use case wherein the bug occurs.

Running the compiler with --build

$ tsc --build

$ git status
On branch main
Untracked files:
  (use "git add <file>..." to include in what will be committed)
        tsconfig.tsbuildinfo

nothing added to commit but untracked files present (use "git add" to track)

Running the compiler with --build --clean

$ tsc --build --clean

$ git status
On branch main
Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        deleted:    index.js

no changes added to commit (use "git add" and/or "git commit -a")

🙁 Actual behavior

• index.js is removed
• tsconfig.tsbuildinfo is removed

🙂 Expected behavior

• tsconfig.tsbuildinfo is removed