playing with typescript (probably all wrong)

api/hits.ts

@@ -0,0 +1,83 @@
+"use strict";
+
+import { VercelRequest, VercelResponse } from "@vercel/node";
+import { Client, query as q } from "faunadb";
+import numeral from "numeral";
+import pluralize from "pluralize";
+import dotenv from "dotenv";
+
+dotenv.config();
+
+module.exports = async (req: VercelRequest, res: VercelResponse) => {
+  const { slug } = req.query;
+
+  try {
+    // some rudimentary error handling
+    if (!process.env.FAUNADB_SERVER_SECRET) {
+      throw new Error("Database credentials aren't set.");
+    }
+    if (req.method !== "GET") {
+      throw new Error(`Method ${req.method} not allowed.`);
+    }
+    if (!slug || slug === "/") {
+      throw new Error("Parameter `slug` is required.");
+    }
+
+    const client = new Client({
+      secret: process.env.FAUNADB_SERVER_SECRET,
+    });
+
+    // refer to snippet below for the `hit` function defined in the Fauna cloud
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const result = await client.query<any>(q.Call(q.Function("hit"), slug));
+
+    // send client the new hit count
+    res.setHeader("Cache-Control", "private, no-cache, no-store, must-revalidate");
+    res.setHeader("Expires", 0);
+    res.setHeader("Pragma", "no-cache");
+    res.setHeader("Access-Control-Allow-Methods", "GET");
+    res.setHeader("Access-Control-Allow-Origin", "*");
+    return res.json({
+      slug: result.data.slug,
+      hits: result.data.hits,
+      pretty_hits: numeral(result.data.hits).format("0,0"),
+      pretty_unit: pluralize("hit", result.data.hits),
+    });
+  } catch (error) {
+    console.error(error);
+
+    return res.status(400).json({ message: error.message });
+  }
+};
+
+/**
+
+This is the FaunaDB function named `hit` defined in the cloud:
+https://dashboard.fauna.com/functions/hit/@db/global/jarv.is
+https://docs.fauna.com/fauna/current/api/fql/user_defined_functions
+
+{
+  name: "hit",
+  role: null,
+  body: Query(
+    Lambda(
+      "slug",
+      Let(
+        { match: Match(Index("hits_by_slug"), Var("slug")) },
+        If(
+          Exists(Var("match")),
+          Let(
+            {
+              ref: Select("ref", Get(Var("match"))),
+              hits: ToInteger(Select("hits", Select("data", Get(Var("match")))))
+            },
+            Update(Var("ref"), { data: { hits: Add(Var("hits"), 1) } })
+          ),
+          Create(Collection("hits"), { data: { slug: Var("slug"), hits: 1 } })
+        )
+      )
+    )
+  )
+}
+
+*/