jest: Back out jest-expo preset, again.

A reversion of c4fca9d, continuing a pattern of adding and
removing `jest-expo` as we learn new things:

62621ef jest: Add `jest-expo` preset, to be used in the next commit.
347aa96 jest: Back out `jest-expo` preset, for now.
c4fca9d jest: Add and use `jest-expo` preset, again.

This time, we learn that `jest-expo` in its current latest version
brings in Jest 25, and Jest 25 ends up being used to run our tests
instead of Jest 26, which we took in our own direct dependencies, in
fb23341.

Without backing out `jest-expo`, the next few commits (where we
start using Jest's fake timers) would see symptoms like those we saw
while working on fb23341, before we realized it was necessary to
add @jest/source-map. The new "modern" fake-timer implementation
isn't available, and we get no friendly message from Jest to tell us
about it [1].

When `jest-expo` comes out with a version that has Jest 26 in its
dependencies, we can presumably take that version.

[1] In Jest 25, calling `jest.useFakeTimers('modern')` is error-free
    but has the same effect as `jest.useFakeTimers()`, which, in Jest
    26, is a way to spell `jest.useFakeTimers('legacy')`.

android/app/src/main/java/com/zulipmobile/generated/BasePackageList.java

@@ -12,8 +12,7 @@ public List<Package> getPackageList() {
         new expo.modules.filesystem.FileSystemPackage(),
         new expo.modules.imageloader.ImageLoaderPackage(),
         new expo.modules.permissions.PermissionsPackage(),
-        new expo.modules.screenorientation.ScreenOrientationPackage(),
-        new expo.modules.splashscreen.SplashScreenPackage()
+        new expo.modules.screenorientation.ScreenOrientationPackage()
     );
   }
 }

ios/Podfile.lock

@@ -23,9 +23,6 @@ PODS:
   - EXScreenOrientation (1.0.0):
     - React-Core
     - UMCore
-  - EXSplashScreen (0.5.0):
-    - React
-    - UMCore
   - FBLazyVector (0.62.2)
   - FBReactNativeSpec (0.62.2):
     - Folly (= 2018.10.22.00)
@@ -405,7 +402,6 @@ DEPENDENCIES:
   - EXImageLoader (from `../node_modules/expo-image-loader/ios`)
   - EXPermissions (from `../node_modules/expo-permissions/ios`)
   - EXScreenOrientation (from `../node_modules/expo-screen-orientation/ios`)
-  - EXSplashScreen (from `../node_modules/expo-splash-screen/ios`)
   - FBLazyVector (from `../node_modules/react-native/Libraries/FBLazyVector`)
   - FBReactNativeSpec (from `../node_modules/react-native/Libraries/FBReactNativeSpec`)
   - Flipper (~> 0.39.0)
@@ -520,8 +516,6 @@ EXTERNAL SOURCES:
     :path: "../node_modules/expo-permissions/ios"
   EXScreenOrientation:
     :path: "../node_modules/expo-screen-orientation/ios"
-  EXSplashScreen:
-    :path: "../node_modules/expo-splash-screen/ios"
   FBLazyVector:
     :path: "../node_modules/react-native/Libraries/FBLazyVector"
   FBReactNativeSpec:
@@ -649,7 +643,6 @@ SPEC CHECKSUMS:
   EXImageLoader: 02ca02c9cd5cc8a97b423207a73a791e0a86bea5
   EXPermissions: 80ac3acbdb145930079810fe5b08c022b3428aa8
   EXScreenOrientation: 44d3cd3a99a86b9cb681e742697bc2c057d7fbd2
-  EXSplashScreen: 9423d258b71afa5bf128a83dcb57b636d9900a74
   FBLazyVector: 4aab18c93cd9546e4bfed752b4084585eca8b245
   FBReactNativeSpec: 5465d51ccfeecb7faa12f9ae0024f2044ce4044e
   Flipper: bee8d5809012d1b6affa747fb756567ecd8c7c0b

jest.config.js

@@ -4,7 +4,6 @@
 // These will be used as regexp fragments.
 const transformModulesWhitelist = [
   'expo-apple-authentication',
-  'expo-application',
   'react-native',
   // @rnc/async-storage itself is precompiled, but its mock-helper is not
   '@react-native-community/async-storage',
@@ -25,7 +24,7 @@ const transformModulesWhitelist = [
 const transformIgnorePattern = `node_modules/(?!${transformModulesWhitelist.join('|')})`;
 
 module.exports = {
-  preset: 'jest-expo',
+  preset: 'react-native',
 
   // Finding and transforming source code.
 

jest/jestSetup.js

@@ -85,6 +85,10 @@ jest.mock('react-native-simple-toast', () => ({
   showWithGravity: jest.fn(),
 }));
 
+jest.mock('expo-application', () => ({
+  nativeApplicationVersion: '26.23.146',
+}));
+
 jest.mock('react-native-device-info', () => ({
   getSystemName: jest.fn().mockReturnValue('ios'),
   getSystemVersion: jest.fn().mockReturnValue('13.3.1'),
@@ -101,3 +105,10 @@ jest.mock('react-native-image-picker', () => ({
   launchCamera: jest.fn(),
   launchImageLibrary: jest.fn(),
 }));
+
+jest.mock('expo-apple-authentication', () => ({
+  AppleAuthenticationButton: jest.fn(),
+  isAvailableAsync: jest.fn(),
+  signInAsync: jest.fn(),
+  // etc. (incomplete)
+}));

package.json

@@ -47,7 +47,6 @@
     "expo-apple-authentication": "^2.1.1",
     "expo-application": "^2.1.1",
     "expo-screen-orientation": "^1.0.0",
-    "expo-splash-screen": "^0.5.0",
     "immutable": "^4.0.0-rc.12",
     "json-stringify-safe": "^5.0.1",
     "katex": "^0.11.1",
@@ -125,7 +124,6 @@
     "jest-cli": "^26.4.1",
     "jest-environment-jsdom": "^26.3.0",
     "jest-environment-jsdom-global": "^2.0.4",
-    "jest-expo": "^38.0.2",
     "jest-extended": "^0.11.5",
     "jetifier": "^1.6.5",
     "lolex": "^5.1.1",
@@ -134,9 +132,7 @@
     "prettier-eslint": "^11.0.0",
     "prettier-eslint-cli": "^5.0.0",
     "prop-types": "^15.7.2",
-    "react-dom": "16.11.0",
     "react-native-cli": "^2.0.1",
-    "react-native-web": "^0.13.3",
     "redux-mock-store": "^1.5.1",
     "rollup": "^2.26.5",
     "typescript": "~3.8.3",