Upgrade to ldclient-js 1.7.4

[patcoll]

Hey @achambers, as a first step I upgraded the ldclient-js library to version 1.7.4, which is the one right before 2.0.0. I did this to bisect the rather large jump in version numbers, so that when the upgrade to 2.0.0 happens, we can rule out problems from any changes in the 1.x series.

All tests pass. (Could we set up TravisCI or CircleCI for open source purposes to see CI results on GitHub?)

I don't have quick access to test this in a prod or even a test environment. Is it possible for you to try it out and see if there are any red flags?

[achambers]

@patcoll How'd you get on with the new LD account?

[patcoll]

@achambers I haven't had the chance to loop back around to it, unfortunately.

[achambers]

@patcoll Mate, sorry about the lack of comms. Been crazy busy. I'm going to switch a little bit of focus to this today so hopefully we can get this thing shipped :)

[achambers]

Just looking at the changelog for the changes. The following are things of interest:

1.1.13

• Emits error event now when error connecting. This is potentially something we should use. In the last two apps I've built I've needed to set the local client in the case of an error so that we default to the local flags. Might be useful if the addon does this for us.

1.3.0

• waitUntilReady seems interesting and also identify is promise aware. Maybe we can remove the callbacks and use async/await or promises

1.6.2

• We don't implement this track property. Maybe it's something to leave until someone requests it though.

Ok, so, maybe the error event is worth looking at as a part of this PR. Or maybe we just leave it, upgrade, and add this stuff as improvements later.

Thoughts?

[achambers]

Have tested this against my work app and it works fine. Let's merge it 👍