Vue version

3.2.37

Link to minimal reproduction

https://sfc.vuejs.org/#eNp9Us1uwyAMfhWLyzaphXuUVqqmHXraHoBLmjgtVfgRkFZTlXefgSzdtJ8Lwtj+fmxubOccv4zIKlaH1isXIWAc3VYapZ31EZ6tdtB7q0EyLlKU6iWTphalg2opiKjd0ESkCKBOdds6l9NDLZYsW7ECvNaN4+dgDVHfUo+cE0GyCvJLestcFV1OMbpQCRH6Ngk4B279UdCN+9FEpZFj0OuDt9eAnoCTQoBJmokoP2V/sTk05riRLNEtloWAfQ97mK2/XNDE4j2+OwzQqwFXcESDnrx04Lx1OQUqkEQzDkOindtvM8BUIB64yCgP2ezCNQbqNhF937QIVxVPyvxOlDleD2dsY2ZZmnbGxhP6wpYnp7oKzKgP6Ml/4buXvxFYKHWYWqqiM8UNIc1A1TfYBaa1JsSsJ8AGOuyVwQxY53P7+PT/x0hjTptNG7Fmpq3Fz1+SZ8U7HgMt7S7+L5Ns+gDiTvl6

Steps to reproduce

1. Open the SFC playground
2. Look at the Comp.vue's generated JS
3. Check the props type

What is expected?

event type should be Object just like anotherEvent.

What is actually happening?

event type is null

System Info

System:
    OS: Linux 5.15 Ubuntu 22.04 LTS 22.04 LTS (Jammy Jellyfish)
    CPU: (16) x64 AMD Ryzen 7 3700X 8-Core Processor
    Memory: 2.35 GB / 15.57 GB
    Container: Yes
    Shell: 5.1.16 - /bin/bash
  Binaries:
    Node: 16.14.2 - ~/.nvm/versions/node/v16.14.2/bin/node
    Yarn: 1.22.18 - ~/.nvm/versions/node/v16.14.2/bin/yarn
    npm: 8.5.0 - ~/.nvm/versions/node/v16.14.2/bin/npm
  Browsers:
    Chrome: 101.0.4951.64
  npmPackages:
    vue: ^3.2.37 => 3.2.37

### Any additional comments?

I want to extract props types from TS to JS.

duplicate of #4294