🐛(tokens) fix scss generator

scss maps expect keys between quotes like:
$map = (
  'key': value,
)

.changeset/nasty-donuts-run.md

@@ -0,0 +1,5 @@
+---
+"@openfun/cunningham-tokens": minor
+---
+
+Fix SassGenerator

packages/tokens/src/bin/Generators/SassGenerator.spec.ts

@@ -26,26 +26,26 @@ describe("SassGenerator", () => {
     expect(fs.existsSync(sassFile)).toEqual(true);
     expect(fs.readFileSync(sassFile).toString()).toMatchInlineSnapshot(`
       "$colors: (
-        primary: #055FD2,
-        secondary: #DA0000,
-        ternary: (
-          900: #022858
+        'primary': #055FD2,
+        'secondary': #DA0000,
+        'ternary': (
+          '900': #022858
         )
       );
       $fontFamilies: (
-        base: Roboto
+        'base': Roboto
       );
       $fontSizes: (
-        m: 1rem
+        'm': 1rem
       );
       $fontWeights: (
-        medium: 400
+        'medium': 400
       );
       $spacings: (
-        s: 1rem
+        's': 1rem
       );
       $transitions: (
-        ease: linear
+        'ease': linear
       );
       "
     `);

packages/tokens/src/bin/Generators/SassGenerator.ts

@@ -55,7 +55,19 @@ const generateTransitionsSassMap = (tokens: Tokens) => {
 };
 
 function JSONToSassMap(json: Object) {
-  return JSON.stringify(json, null, 2)
+  function deepQuoteObjectKeys(object: Object) {
+    return Object.entries(object).reduce(
+      (acc, [key, value]): Record<string, any> => ({
+        ...acc,
+        [`'${key}'`]:
+          typeof value === "object" ? deepQuoteObjectKeys(value) : value,
+      }),
+      {}
+    );
+  }
+  const jsonWithQuotedKeys = deepQuoteObjectKeys(json);
+
+  return JSON.stringify(jsonWithQuotedKeys, null, 2)
     .replace(/{/g, "(")
     .replace(/}/g, ")")
     .replace(/"/g, "");