attempt

functions/.gitignore

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+## Compiled JavaScript files
+**/*.js
+**/*.js.map
+
+# Typescript v1 declaration files
+typings/
+
+node_modules/

functions/src/index.ts

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+import * as functions from 'firebase-functions';
+import * as cor from 'cors';
+
+const cors = cor({origin: true});
+
+exports.helloWorld = functions.https.onRequest((req, res) => {
+    return cors(req, res, () => {
+        res.status(200).send('Hello World!');
+    });
+});