Add default to getEnvVar and better typing

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mifi/services-common",
-  "version": "1.0.9",
+  "version": "1.0.11",
   "author": "mifi (Mike Fitzpatrick)",
   "license": "MIT",
   "scripts": {

src/utils/getEnvVar.ts

@@ -1,5 +1,6 @@
-export const getEnvVar = (key: string) => {
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export const getEnvVar = <T = any>(key: string, defaultValue: T): T => {
     const val = process.env[key];
-    if (!val) return undefined;
+    if (!val) return defaultValue as T;
     else return JSON.parse(val);
 };