* Add event support to urql client

* Allow for weaker types

* Add type safety (opt-in)

* Disable in prod

* Apply suggestions from code review
Co-Authored-By: Will Golledge <35961363+wgolledge@users.noreply.github.com>

* Add missing fixes

* Force exchange to be provided with event.

* Rename eventTarget to debugTarget

* Compile away dispatchEvent (#628)

* compile away dispatchEvent

* correct typo

* don't enforce callee name (client)

* Add optional to debugTarget type

* Rename to debugTarget in babel plugin

* rename files

* fix bug where objProperty is undefined

* fix linting

* add debugTarget to tests

* fix tests

* Add debug dispatches for fetch + fallback exchanges (#659)

* Add debug dispatching for fetchExchange
Co-authored-by: Will Golledge <wiggiumg@gmail.com>

* Add fallback exchange debugEvent dispatch
Co-authored-by: Will Golledge <wiggiumg@gmail.com>

* Amend Jovis comments

* Fix fetch tests
Co-authored-by: Will Golledge <wiggiumg@gmail.com>

* Add debugEvent dispatches for retryExchange and graphcacheExchange (#660)

* Add debugEvent dispatches for both the retryExchange and graphcacheExchange
Co-Authored-By: Jovi De Croock <jovi.decroock@formidable.com>

* Update changeset

* Append source to debug event on call

* Update dispatchEvent calls

* Isolate debug function construction to composeExchanges

* Fix cache exchange tests

* Fix graphcache exchange tests

* Fix fallback exchange tests

* Update client snapshot

* Update tests for subscription exchange

* Update tests for populate exchange

* Update tests for fetch exchange

* Update external exchanges

* Fix more tests

* Add test for dispatch function

* Add test for Target

* update withurqlclient tests

* Add babel transform changes

* update babel plugin (#671)

* update babel plugin

* add backwards compat check

* improve readability

* remove types import

* undo templating due to the addition of semicolons
Co-authored-by: Andy Richardson <andy.john.richardson@gmail.com>

* Update transform-debug-target.js

* Replace bad merge

* Delete debug.ts

* Add timestamp and uid to events

* Remove id

* Update test

* Update packages/core/src/types.ts

* Show error for successful network request with GraphQL errors

* Fix renamed variable

* Update exchanges/graphcache/src/cacheExchange.ts

* Apply suggestions from code review

* Update exchanges/retry/src/retryExchange.ts

* Use source for debug events (#710)

* Use source for debug events

* Update exposed API

* Fix type import

* Stop exposing debugTarget.dispatchDebug on Client

This makes the composition a little nicer, if we also
don't read it in composeExchanges.

* Restore backwards-compatibility by preserving fallbackExchangeIO

* Fix up unit tests

* Update changeset

The exchange packages depend on @urql/core and will bump their minimum
dependency range to include the new core version anyway.

* Update multipartFetchExchange and fix fetchSuccess condition

There's no clear "success" / "error" condition when we get a
result. A result can contain data and errors, hence we should
only log a result as a definitive error if we also don't have
data.

* Update changeset

* Fix compose.test.ts

* Update transform-debug-target transform

dispatchDebug cannot be undefined anymore (but will be a noop).

We can simply wrap the call expression in a ternary and let Terser/Closure
take care of eliminating the dead variables and assignments. This also
results in a lower chance of having a dead function stick around, which was
defined in the ObjectProperty transform.

* Update Client snapshot

* Add link to devtools to the changeset
Co-authored-by: Will Golledge <35961363+wgolledge@users.noreply.github.com>
Co-authored-by: Jovi De Croock <jovi.decroock@formidable.com>
Co-authored-by: Will Golledge <wiggiumg@gmail.com>
Co-authored-by: Phil Pluckthun <phil@kitten.sh>