Hi @aryaemami59!, thanks for the Pull Request

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I apologize for neglecting this important PR, I will finish it soon. In the meantime I could use some ideas on writing unit-tests.

In the meantime I could use some ideas on writing unit-tests.

For unit testing probably we will want to check if the current instance of Node.js supports type stripping and only then run the new tests.

describe("TypeScript config files with type stripping", () => {

    if (process.features.typescript !== "strip") {
        return;
    }

    // Unit tests here...

});

Our CI workflow runs unit tests in different versions of Node.js, including Node.js 23.x which has type stripping enabled by default, and the new tests would only run in that versions.

To test with type transformation enabled, we could start by doing something similar, but since no version of Node.js supports type transformation out of the box at the moment, we will have to wait until Node.js 24 is released. Or we could force type transformation support by launching a CI test with Node.js 22.x and the --experimental-transform-types flag set. That could be done by extending our test matrix with a new variable to control if the --experimental-transform-types should be set.

      matrix:
        os: [ubuntu-latest]
        node: [23.x, 22.x, 21.x, 20.x, 18.x, "18.18.0"]
        include:
          - os: windows-latest
            node: "lts/*"
          - os: macOS-latest
            node: "lts/*"
+         - os: ubuntu-latest
+           node: 22.x
+           experimental_transform_types: true

We would then conditionally set the --experimental-transform-types flag in the node command line depending on that value.