firebase functions set up

.firebaserc

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+{
+  "projects": {
+    "default": "ecom-solo"
+  }
+}

firebase.json

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+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint"
+    ]
+  }
+}

functions/.eslintrc.js

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+module.exports = {
+  root: true,
+  env: {
+    es6: true,
+    node: true,
+  },
+  extends: [
+    "eslint:recommended",
+    "google",
+  ],
+  rules: {
+    quotes: ["error", "double"],
+  },
+};

functions/.gitignore

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+node_modules/

functions/index.js

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+const functions = require("firebase-functions");
+const express = require("express");
+const cors = require("cors");
+
+const app = express();
+
+app.use(cors({origin: true}));
+app.use(express.json());
+
+app.get("*", (req, res) => {
+  res.status(404).send("404, Not Found.");
+});
+
+exports.api = functions.https.onRequest(app);