fix(json-text): 🐛 classify null as primitive

Author: streamich

src/json-text/__tests__/toTree.spec.ts

@@ -49,7 +49,7 @@ test('can format complex object', () => {
         └─ key
            ├─ [0]: 1
            ├─ [1]: 2
-           ├─ [2]!n
+           ├─ [2]: !n
            ├─ [3]: !t
            └─ [4]: !f"
   `);

src/json-text/toTree.ts

@@ -1,7 +1,7 @@
 import {printTree} from 'tree-dump/lib/printTree';
 import {stringify} from './stringify';
 
-const isPrimitive = (value: unknown): boolean => typeof value !== 'object';
+const isPrimitive = (value: unknown): boolean => typeof value !== 'object' || value === null;
 const isOneLineValue = (value: unknown): boolean => {
   if (isPrimitive(value)) return true;
   if (value instanceof Array && !value.length) return true;