Hi!
You do not need to know jQuery.
"But TypeScript is so much more easier" =>
Want to rephrase this to But with Javascript it is much harder to learn something about AngularJS 2.
After reading guidelines, tutorials, examples, than, I can say, yes, you definitely need to learn Typescript
or you will get different troubles by trying figure out, how to use AngularJS 2 with Javascript.
10 time less any information and examples for Typescript, examples in official tutorial are broken for Javascript.
At least in 2 of 4, which I have checked.
At the moment, you need definitely learn Typescript.
As, I describe the situation for now, the situation may/should/can change in future for Javascript.