`ready` event is emitted on error when initializing client

[Ifeanyi Oraelosi]

Is your feature request related to a problem? Please describe.

A LaunchDarklyFlagFetchError is sometimes thrown during client initialization. This seems to occur because the ready event gets emitted as soon as the initialization logic has finished, regardless of whether it succeeded as explained here: launchdarkly/js-client-sdk#113 (comment)

Describe the solution you'd like

The ready event is only emitted on successful initialization

Describe alternatives you've considered

The waitUntilReady method call here

flopflip/packages/launchdarkly-adapter/modules/adapter/adapter.ts

Line 151 in 9537bd2

 return adapterState.client.waitUntilReady().then(() => { 

could be replaced with the waitForInitialization method as discussed here:
launchdarkly/js-client-sdk#113 (comment)

[Tobias Deekens]

Awesome. Thanks for letting me know this exists. Wasn't aware.