Deprecate --outFile

[RyanCavanaugh]

Fixes #62980

[Copilot]

Pull request overview

This pull request deprecates the --outFile compiler option in TypeScript, aligning with the broader effort to phase out legacy module bundling features in favor of modern bundlers.

Changes:

• Added deprecation error TS5101 for the --outFile option across the compiler test suite
• Updated baseline files to reflect the new deprecation warning in error outputs

Reviewed changes

Copilot reviewed 300 out of 534 changed files in this pull request and generated no comments.

File	Description
All .errors.txt files in tests/baselines/reference/	Updated baseline error outputs to include TS5101 deprecation warning for --outFile option
outFileIsDeprecated.types, outFileIsDeprecated.symbols, outFileIsDeprecated.js	New baseline files for test validating the deprecation warning
multipleDeclarations.types, methodsReturningThis.types, jsdocReadonlyDeclarations.types, etc.	Minor formatting changes in type baseline files (additional line number annotations)

[jakebailey]

I will dare

@typescript-bot user test this
@typescript-bot test top800

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
user test this	✅ Started	✅ Results
test top800	✅ Started	✅ Results

[typescript-bot]

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/62981/merge:

There were infrastructure failures potentially unrelated to your change:

• 1 instance of "Package install failed"
• 1 instance of "Git clone failed"

Otherwise...

Everything looks good!

[typescript-bot]

@jakebailey Here are the results of running the top 800 repos with tsc comparing main and refs/pull/62981/merge:

Everything looks good!