TypeMismatchError on post

Question

I'm writing an aurelia application with aurelia-fetch-client library. When I try to post an object to my api service I get the error:

TypeMismatchError

In console only from Edge. Other browsers (Chrome, Firefox and IE11) have no problems. There are no description or any other details about it.

@jrbedard Have you tried to breakpoint the API to see if it's the api that is causing the error or the client? — Brandon, Oct 10 '16 at 15:51
@James I tried to breakpoint the api, but the error happen before its execution, so I assumed it's a client problem — Federico Galfione, Oct 11 '16 at 08:00

score 1 · Answer 1 · answered Oct 10 '16 at 18:50

In all but the newest versions of Edge you need to include the fetch polyfill in order for aurelia-fetch-client to work. I think it's supported since version 14 but I wouldn't necessarily rely on it. Edge is known to be quirky with some of these things (the Promise implementation is also horribly slow, which is why I personally always use bluebird)

You can install it with npm i whatwg-fetch --save and make sure to import it + include it in your bundle config (the instructions for this depend on which build system you're using)

Thanks for the quick reply and sorry for not being precise, but I'm already using whatwg-fetch and I have the same problem with it and without it — Federico Galfione, Oct 11 '16 at 08:10

TypeMismatchError on post

1 Answers1