[functions][js] start of functions implementationn

lib/modules/functions/index.js

@@ -0,0 +1,34 @@
+/**
+ * @flow
+ * Functions representation wrapper
+ */
+import ModuleBase from '../../utils/ModuleBase';
+import { getNativeModule } from '../../utils/native';
+
+import type App from '../core/app';
+
+export const MODULE_NAME = 'RNFirebaseFunctions';
+export const NAMESPACE = 'functions';
+
+type HttpsCallable = (data?: any) => Promise<any>;
+
+export default class Analytics extends ModuleBase {
+  constructor(app: App) {
+    super(app, {
+      moduleName: MODULE_NAME,
+      multiApp: false,
+      hasShards: false,
+      namespace: NAMESPACE,
+    });
+  }
+
+  /**
+   * Returns a reference to the callable https trigger with the given name.
+   * @param name The name of the trigger.
+   */
+  httpsCallable(name: string): HttpsCallable {
+    return (data?: any) => getNativeModule(this).httpsCallable(name, data);
+  }
+}
+
+export const statics = {};