ESM syntax in REPL doesn't work

[segevfiner]

Bug description

Have some .ts file and try to import it using ESM syntax in the REPL. The variable will be left undefined.

Reproduction

index.ts:

export default "Hello, World!";

❯ tsx
Welcome to tsx v3.6.0 (Node.js v16.15.1).
Type ".help" for more information.
> import hello from './index'
undefined
> hello
Uncaught ReferenceError: hello is not defined
>

Environment

  System:
    OS: macOS 12.4
    CPU: (10) arm64 Apple M1 Pro
    Memory: 440.86 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v16.15.1/bin/yarn
    npm: 8.13.1 - ~/.nvm/versions/node/v16.15.1/bin/npm

tsx is version 3.6.0, envinfo fails to list it for some reason.

Can you contribute a fix?

• I’m interested in opening a pull request for this issue.

[privatenumber]

Import statements are not supposed to work in the REPL, but you can use a dynamic import expression instead.

I'll keep this open because there should be an error/warning emitted.