In PWA Studio we have a mutation composed of two mutations. I found that when requesting a "additionalpayment_methods" in both response objects the grandtotal in the second mutation response body comes back as the total from after the first mutation.

1. Enter /p/38143c0c-c9b0-448c-93cd-60eb90d8da57/aspesi-shirt-h805-white
2. Change size
3. See the error

Thanks to awesome work of @ResuBaka in #210 we now are able to use typescript. Even though JS still is and will be supported, we'd like to fully utilize benefits of this feature by rewriting the code with typings. Contributions with any VSF-API parts are welcome but please, group it by segments/directories (i.e. a full extension, whole API section, whole lib, full one platform, etc). PRs of single