feat: Add utils to save data to JSON files

...useful when measuring performance.

app/next.config.js

@@ -99,6 +99,11 @@ module.exports = withPreconstruct(
           new IgnorePlugin({ resourceRegExp: /^(pg-native|vue)$/ })
         );
 
+        config.resolve.fallback = {
+          ...config.resolve.fallback,
+          fs: false,
+        };
+
         return config;
       },
     })

app/utils/getSaveJson.ts

@@ -0,0 +1,40 @@
+import fs from "fs";
+
+/**
+ * Use this function to get a JSON file from the filesystem.
+ * If the file doesn't exist, the function will return the `initialState`.
+ */
+export const getJSON = <T extends object>(
+  filename: string,
+  initialState: T
+): T => {
+  try {
+    const file = fs.readFileSync(`${filename}.json`, "utf-8");
+
+    if (file) {
+      return JSON.parse(file) as T;
+    }
+  } catch (e) {
+    console.log(`No file found for ${filename}.json. Creating new one!`);
+  }
+
+  return initialState;
+};
+
+/**
+ * Use this function to save a JSON file to the filesystem.
+ * 
+ * @example
+ * const data = getJSON("timeResults", {
+    constructTime: 0,
+    selectTime: 0,
+    queryCount: 0,
+  });
+  data.constructTime += constructTime;
+  data.selectTime += selectTime;
+  data.queryCount++;
+  saveJSON("timeResults", data);
+ */
+export const saveJSON = <T extends object>(filename: string, data: T) => {
+  fs.writeFileSync(`${filename}.json`, JSON.stringify(data, null, 2), "utf-8");
+};