Fix some tests and definition of dependencies option

[Mingun]

This PR fixes three things:

• some new behavior tests did not use the options, so not all variants were tested
• options.definitions was declared with type any instead of object
• options.exportVar was declared with type any instead of string; for globals format it is required

[Mingun]

I think, this is next that should be merged. I'll rebase other my PR on this.

[hildjj]

Add Dependencies to test/types/peg.test-d.ts?

[Mingun]

I've looked to existent tests -- all of them check that something that returned or passed as parameter has a specified type. In that case situation is different -- we should pass object with type Dependencies to the method. I'm not sure:

• what we want to check there?
• how to do that correctly?

[hildjj]

I'm going to merge this. I may go and add some ts tests myself, but let's do that in parallel so you can keep moving without having to continue to rebase this.