Make jest react-native preset to use typescript files (#22217)

Summary:
Metro and react-native now have first-class support to Typescript with Babel 7, but react-native Jest preset needs specific settings to work with .ts and .tsx files.
This PR updates react-native Jest preset to use Typescript out of the box.
Pull Request resolved: https://github.com/facebook/react-native/pull/22217

Differential Revision: D13396206

Pulled By: cpojer

fbshipit-source-id: aa4e4163e555c6b213457755bc13432fa1cddf5e

jest-preset.json

@@ -7,6 +7,14 @@
       "react-native"
     ]
   },
+  "moduleFileExtensions": [
+        "js",
+        "json",
+        "jsx",
+        "node",
+        "ts",
+        "tsx"
+      ],
   "moduleNameMapper": {
     "^React$": "<rootDir>/node_modules/react"
   },
@@ -14,12 +22,16 @@
     "<rootDir>/node_modules/react-native/Libraries/react-native/"
   ],
   "transform": {
-    "^.+\\.js$": "babel-jest",
+    "^.+\\.(js|ts|tsx)$": "babel-jest",
     "^.+\\.(bmp|gif|jpg|jpeg|mp4|png|psd|svg|webp)$": "<rootDir>/node_modules/react-native/jest/assetFileTransformer.js"
   },
   "transformIgnorePatterns": [
     "node_modules/(?!(jest-)?react-native|react-clone-referenced-element)"
   ],
+  "testMatch": [
+    "**/__tests__/**/*.(js|ts|tsx)",
+    "**/?(*.)+(spec|test).(js|ts|tsx)"
+  ],
   "setupFiles": [
     "<rootDir>/node_modules/react-native/jest/setup.js"
   ],