… of createSafeLogger.

* Improved emitter design
* Improved jest config
* Added unit tests

Added Configuration class and options validation for js client common.

Co-authored-by: Yusinto Ngadiman <[email protected]>

…atio. (#248)

Co-authored-by: Yusinto Ngadiman <[email protected]>

Co-authored-by: Yusinto Ngadiman <[email protected]>

…rations

Please don't be alarmed with 55 file changes. Most are just import path
changes due to existing files being moved from sdk-server to
shared/common to be re-used across server and client sdks:

1. Move EventSender and its tests
2. Move errors.ts
3. Move NullEventProcessor
4. Move defaultHeaders and httpErrorMessage to utils/http.ts

In addition, please also note these important changes:

1. `EventSender` is now intrinsic to EventProcessor and is excluded from
the EventProcessor constructor.
2. `contextDeduplicator` is now optional because client sdks don't use
them
3. `defaultHeaders` arguments order have changed to
`defaultHeaders(sdkKey, info, tags)`

---------

Co-authored-by: LaunchDarklyReleaseBot <[email protected]>

…282)

Co-authored-by: Yusinto Ngadiman <[email protected]>
resolves #285

Large pr but mostly trivial changes to import paths because mocks have
been moved to its own private project `@launchdarkly/private-js-mocks`:

* Refactored mocks to its own project `@launchdarkly/private-js-mocks`.
* Better eslint rule for `no-unused-vars` to avoid disabling this rule
sporadically.

CI failed because `yarn workspaces foreach -pR --topological-dev --from
'@launchdarkly/xxx' run build`. This is because `topological-dev`
instructs yarn to build all deps (prod & dev) prior to running build in
the current workspace. Since `mocks` need types from `common` this
fails.

This pr adds a `build-types` command to common which gets run prior to
mocks `build` command to ensure common types exist for mocks to be built
successfully.

First attempt to implement an initial flag fetch followed by emitting
events. I also added comments like this:

```tsx
Dom api usage: xxx
```

There are three right now: fetch, btoa and EventTarget. I left comments
in the code for react native how to deal with these.

---------

Co-authored-by: LaunchDarklyReleaseBot <[email protected]>
Co-authored-by: Ryan Lamb <[email protected]>