Add Firebase Crash Reporting for iOS and Android

lib/modules/crash/index.js

@@ -0,0 +1,42 @@
+// @flow
+import { NativeModules } from 'react-native';
+import { Base } from './../base';
+
+const FirebaseCrash = NativeModules.RNFirebaseCrash;
+
+export default class Analytics extends Base {
+  /**
+   * Logs a message that will appear in a subsequent crash report.
+   * @param {string} message
+   * @param params
+   */
+  log(message: string): void {
+    FirebaseCrash.log(message);
+  }
+
+  /**
+   * Logs a message that will appear in a subsequent crash report as well as in logcat.
+   * NOTE: Android only functionality. iOS will just log the message.
+   * @param {string} message
+   * @param {number} level
+   * @param {string} tag
+   */
+  logcat(level: number, tag: string, message: string): void {
+    FirebaseCrash.logcat(level, tag, message);
+  }
+
+  /**
+   * Generates a crash report for the given message. This method should be used for unexpected
+   * exceptions where recovery is not possible.
+   * NOTE: on iOS, this will cause the app to crash as it's the only way to ensure the exception
+   * gets sent to Firebase.  Otherwise it just gets lost as a log message.
+   * @param {string} message
+   */
+  report(message: string): void {
+    FirebaseCrash.report(message);
+  }
+
+  get namespace(): string {
+    return 'firebase:crash';
+  }
+}