fix: readEnvVariable throws error when variable is string

src/libs/readEnvVariable.spec.ts

@@ -3,10 +3,27 @@ import { describe, expect, it } from "bun:test";
 import { readEnvVariable } from "./readEnvVariable";
 
 describe("readEnvVariable", () => {
-  it("env & variable defined, returns env value", () => {
-    expect(
-      readEnvVariable<boolean>({ ENABLE_ANIFY: "false" }, "ENABLE_ANIFY"),
-    ).toBe(false);
+  describe("env & variable defined", () => {
+    it("returns boolean", () => {
+      expect(
+        readEnvVariable<boolean>({ ENABLE_ANIFY: "false" }, "ENABLE_ANIFY"),
+      ).toBe(false);
+    });
+
+    it("returns string", () => {
+      expect(
+        readEnvVariable<string>(
+          { QSTASH_TOKEN: "ehf73g8gyriuvnieojwicbg83hc" },
+          "QSTASH_TOKEN",
+        ),
+      ).toBe("ehf73g8gyriuvnieojwicbg83hc");
+    });
+
+    it("returns number", () => {
+      expect(
+        readEnvVariable<number>({ NUM_RETRIES: "123" }, "NUM_RETRIES"),
+      ).toBe(123);
+    });
   });
 
   it("env defined but variable not defined, returns default value", () => {