Improve code readability

Author: sxwei123

src/index.ts

@@ -33,6 +33,7 @@ const jsonStringify = (
     }
 
     if (node === undefined) return;
+    if (node === null) return "null";
     if (typeof node === "number") return isFinite(node) ? "" + node : "null";
     if (typeof node !== "object") return JSON.stringify(node);
 
@@ -47,8 +48,6 @@ const jsonStringify = (
       return out + "]";
     }
 
-    if (node === null) return "null";
-
     if (seen.has(node)) {
       if (allowCycle) return JSON.stringify("__cycle__");
       throw new TypeError("Converting circular structure to JSON");

test/cmp.spec.ts

@@ -1,4 +1,4 @@
-import stringify from "../dist";
+import stringify from "../src";
 
 test("custom comparison function", () => {
   const obj = { c: 8, b: [{ z: 6, y: 5, x: 4 }, 7], a: 3 };

test/nested.spec.ts

@@ -1,5 +1,5 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
-import stringify from "../dist";
+import stringify from "../src";
 
 test("nested", function () {
   const obj = { c: 8, b: [{ z: 6, y: 5, x: 4 }, 7], a: 3 };

test/str.spec.ts

@@ -1,4 +1,4 @@
-import stringify from "../dist";
+import stringify from "../src";
 
 test("simple object", () => {
   const obj = { c: 6, b: [4, 5], a: 3, z: null };

test/to-json.spec.ts

@@ -1,4 +1,4 @@
-import stringify from "../dist";
+import stringify from "../src";
 
 test("toJSON function", () => {
   const obj = {