619 restructure local storage (#628)

* To MMKV migration working

* POC migrated font size settings

* Moved settings to mmkv

* Fix typos

* Migrated contexts slice

* Migrated app slice

* POC instance emoji update

* Migrated drafts

* Migrated simple instance properties

* All migrated!

* Re-structure files

* Tolerant of undefined settings

* Can properly logging in and out including empty state

src/utils/helpers/checkEnvironment.ts

@@ -0,0 +1,49 @@
+import Constants from 'expo-constants'
+
+const mapEnvironment = <T = unknown>({
+  release,
+  candidate,
+  development
+}: {
+  release: T
+  candidate?: T
+  development?: T
+}): T => {
+  if (isDevelopment) {
+    if (development) {
+      return development
+    } else {
+      throw new Error('Development environment but no development handler')
+    }
+  }
+
+  if (isCandidate) {
+    if (candidate) {
+      return candidate
+    } else {
+      throw new Error('Candidate environment but no candidate handler')
+    }
+  }
+
+  if (isRelease) {
+    return release
+  }
+
+  throw new Error(
+    `Environment not set. Please set the environment in the Expo project settings.`
+  )
+}
+
+const isDevelopment =
+  __DEV__ ||
+  ['development'].some(channel => (Constants.expoConfig?.extra?.environment) === channel)
+
+const isCandidate = ['candidate'].some(channel =>
+  (Constants.expoConfig?.extra?.environment) === channel
+)
+
+const isRelease = ['release'].some(channel =>
+  (Constants.expoConfig?.extra?.environment) === channel
+)
+
+export { mapEnvironment, isDevelopment, isCandidate, isRelease }