add jest mock file

[arekkubaczkowski]

closes #564

[thymikee]

Looks good! Such default mocks are super helpful. Left a few nits

[jkepps]

is there a reason this was done in js and not ts? I'm getting a type error when i try to import this in a ts test setup file 😕

[fbartho]

@jkepps use // @ts-ignore in front of your require( for this mock file if you're importing it into TS.

If it was done in TS they would have had to publish it uncompiled as well for non-TS consumers. Since this is an import that exists only to cause side-effects (not to expose api elements). That's not really a heavy burden for us consumers.

[jkepps]

got it, thanks @fbartho!