fix: add-font-style parser for null props

.changeset/sour-numbers-arrive.md

@@ -0,0 +1,5 @@
+---
+'@tokens-studio/sd-transforms': patch
+---
+
+Fix for add-font-styles parser to deal with value props not being objects (e.g. null).

src/parsers/add-font-styles.ts

@@ -13,6 +13,9 @@ function recurse(
 ) {
   for (const key in slice) {
     const token = slice[key];
+    if (typeof token !== 'object' || token === null) {
+      continue;
+    }
     const { type, value } = token;
     if (type === 'typography') {
       if (typeof value !== 'object') {

test/spec/parsers/add-font-styles.spec.ts

@@ -133,4 +133,26 @@ describe('add font style', () => {
       },
     });
   });
+
+  it('does not error on value property equaling null', () => {
+    expect(
+      addFontStyles({
+        foo: {
+          value: {
+            fontWeight: 'Bold',
+            type: null,
+          },
+          type: 'typography',
+        },
+      } as DeepKeyTokenMap<false>),
+    ).to.eql({
+      foo: {
+        value: {
+          fontWeight: 'Bold',
+          type: null,
+        },
+        type: 'typography',
+      },
+    });
+  });
 });