fix: do not add always add fontStyle for fontWeights

.changeset/giant-bears-drum.md

@@ -0,0 +1,5 @@
+---
+'@tokens-studio/sd-transforms': patch
+---
+
+Fix alwaysAddFontStyle option to not apply to tokens of type fontWeight(s), only meant for typography tokens.

src/preprocessors/add-font-styles.ts

@@ -80,7 +80,8 @@ function recurse(
       } else if (tokenType === 'fontWeight') {
         const tokenFontWeightsValue = tokenValue as SingleFontWeightsToken['value'];
         const fontWeight = resolveFontWeight(`${tokenFontWeightsValue}`, refCopy, usesDtcg);
-        const { weight, style } = splitWeightStyle(fontWeight, alwaysAddFontStyle);
+        // alwaysAddFontStyle should only apply to typography tokens, so we pass `false` here
+        const { weight, style } = splitWeightStyle(fontWeight, false);
 
         if (style) {
           // since tokenFontWeightsValue is a primitive (string), we have to permutate the change directly

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

@@ -179,6 +179,27 @@ describe('add font style', () => {
     });
   });
 
+  it(`does not affect fontWeight tokens with alwaysAddFontStyle option`, () => {
+    expect(
+      addFontStyles(
+        // @ts-expect-error fontWeight (singular vs plural) doesn't exist on the type
+        // but we assume it's already preprocessed and aligned here
+        {
+          foo: {
+            value: 'Bold',
+            type: 'fontWeight',
+          },
+        } as DeepKeyTokenMap<false>,
+        { alwaysAddFontStyle: true },
+      ),
+    ).to.eql({
+      foo: {
+        value: 'Bold',
+        type: 'fontWeight',
+      },
+    });
+  });
+
   it(`allows always adding a default fontStyle for DTCG formatted tokens`, () => {
     expect(
       addFontStyles(