Here is your Typescript Interface:
``` typescript
interface PlaceHolder {
    firstname?:string,
    secondName?: string,
    age?: number,
    visits?: number,
    email?: string
}
```

This is a typescript interface that takes your Javascript Object. I do not know what you want me to call your interface, so I have named it PlaceHolder for now. Another assumption made was that all fields in the interface are optional.
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