[Bug]: Typia requires isolatedModules to be false

[ruiaraujo]

Version

29.4.0

Steps to reproduce

https://github.com/ruiaraujo/ts-jest-typia-bug for a repro.

With isolatedModules set to false, the tests pass. Set to true, the tests fail.

When I checked the compiled output, I could see that typia output was not included.
When I debugged, I did see the transform function being called for both cases but I did not yet dig further.

I suspect the root cause is connected to this issue

Expected behavior

The tests should pass regardless of the isolatedModules option.

Actual behavior

Failure when isolatedModules is true

Debug log

Files available in the repo for both state of isolatedModules
ts-jest-false.json
ts-jest-true.json

Additional context

No response

Environment

System:
    OS: macOS 15.5
    CPU: (10) arm64 Apple M1 Max
  Binaries:
    Node: 20.11.1
    npm: 10.2.4 
    pnpm: 10.6.5
  npmPackages:
    jest: ^30.0.4 => 30.0.4

[ahnpnl]

After playing around with your repo, here are some notes related to using ts-patch

• ts-patch will patch the public APIs of typescript. This patching behavior will make ts.Program or ts.LanguageService taking into account of plugins in tsconfig.json. When using isolatedModules: false, ts-jest is using ts.LanguageService which benefits from this patching.

• When using isolatedModules: true, ts-jest will use ts.transpileModule instead of using full ts.Program. This means the transpilation only has the context of the current file and it doesn't know about the usage of typia.

This issue is not related to #4859