Update dependencies and remove unnecessary imports to remove import c…

…ycles.

.babelrc

@@ -1,3 +1,3 @@
 {
-  "presets": ["react-native"]
+  "presets": ["module:metro-react-native-babel-preset"]
 }

.flowconfig

@@ -35,6 +35,9 @@ node_modules/react-native/flow-github/
 [options]
 emoji=true
 
+esproposal.optional_chaining=enable
+esproposal.nullish_coalescing=enable
+
 module.system=haste
 module.system.haste.use_name_reducers=true
 # get basename
@@ -70,4 +73,4 @@ suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
 
 [version]
-^0.75.0
+^0.78.0

package.json

@@ -16,25 +16,35 @@
     "url": "git+https://github.com/Polidea/react-native-ble-plx.git"
   },
   "devDependencies": {
-    "babel-eslint": "8.2.1",
-    "babel-jest": "23.2.0",
-    "babel-preset-react-native": "4.0.0",
+    "babel-eslint": "10.0.1",
+    "babel-jest": "23.6.0",
+    "metro-react-native-babel-preset": "0.45.6",
     "documentation": "8.1.2",
-    "eslint": "4.15.0",
-    "eslint-plugin-flowtype": "2.41.0",
-    "eslint-plugin-import": "2.8.0",
-    "eslint-plugin-jest": "21.7.0",
-    "eslint-plugin-react": "7.5.1",
-    "flow-bin": "^0.75.0",
-    "jest": "22.3.0",
-    "prettier": "1.10.2",
-    "react": "16.4.1",
-    "react-native": "0.56.0"
+    "eslint": "5.6.1",
+    "eslint-plugin-flowtype": "2.50.3",
+    "eslint-plugin-import": "2.14.0",
+    "eslint-plugin-jest": "21.24.1",
+    "eslint-plugin-react": "7.11.1",
+    "flow-bin": "^0.78.0",
+    "jest": "23.6.0",
+    "prettier": "1.14.3",
+    "react": "16.5.0",
+    "react-native": "0.57.1"
   },
-  "keywords": ["React", "Native", "Bluetooth", "Low", "Energy", "BLE", "Polidea"],
+  "keywords": [
+    "React",
+    "Native",
+    "Bluetooth",
+    "Low",
+    "Energy",
+    "BLE",
+    "Polidea"
+  ],
   "jest": {
     "preset": "react-native",
-    "modulePathIgnorePatterns": ["<rootDir>/examples"]
+    "modulePathIgnorePatterns": [
+      "<rootDir>/examples"
+    ]
   },
   "author": "Polidea",
   "license": "Apache-2.0",

src/Characteristic.js

@@ -1,8 +1,8 @@
 // @flow
 'use strict'
 
-import { BleManager } from './BleManager'
-import { BleError } from './BleError'
+import type { BleManager } from './BleManager'
+import type { BleError } from './BleError'
 import type { NativeCharacteristic } from './BleModule'
 import type { DeviceId, Identifier, UUID, TransactionId, Base64, Subscription } from './TypeDefinition'
 

src/Device.js

@@ -1,10 +1,10 @@
 // @flow
 'use strict'
 
-import { BleManager } from './BleManager'
-import { BleError } from './BleError'
-import { Characteristic } from './Characteristic'
-import { Service } from './Service'
+import type { BleManager } from './BleManager'
+import type { BleError } from './BleError'
+import type { Characteristic } from './Characteristic'
+import type { Service } from './Service'
 import { ConnectionPriority } from './TypeDefinition'
 import type { NativeDevice } from './BleModule'
 import type { DeviceId, Base64, UUID, Subscription, TransactionId, ConnectionOptions } from './TypeDefinition'

src/Service.js

@@ -1,9 +1,9 @@
 // @flow
 'use strict'
 
-import { BleManager } from './BleManager'
-import { BleError } from './BleError'
-import { Characteristic } from './Characteristic'
+import type { BleManager } from './BleManager'
+import type { BleError } from './BleError'
+import type { Characteristic } from './Characteristic'
 import type { NativeService } from './BleModule'
 import type { DeviceId, Identifier, Base64, UUID, Subscription, TransactionId } from './TypeDefinition'
 

src/TypeDefinition.js

@@ -1,7 +1,7 @@
 // @flow
 'use strict'
 
-import { Device } from './Device'
+import type { Device } from './Device'
 import { BleErrorCode } from './BleError'
 
 /**