Declare types for this package.

[RahulGautamSingh]

What would you like to be able to do?

We use this package in renovate and due to absence of types.ts file we will have to create a .d.ts file there to declare the module as per typescript rules when strictNullCheck is true.
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Did you already have any implementation ideas?

We can add types.ts file here and declare the types in that file.

I have not written a types.ts file in past but I am learning TS and am interested in implementing the solution.