Update to w3c standard

README.md

@@ -273,6 +273,22 @@ This format is based on the current spec draft of the [Design Tokens W3C Communi
 It is much simpler and makes it easier to define custom transformers for amazon style dictionary.
 
 Every token follows this structure ([learn more](https://github.com/lukasoppermann/design-tokens/blob/main/types/standardToken.d.ts)):
+```js
+type StandardTokenInterface = {
+  name: string,
+  $description?: string,
+  $value: StandardTokenValueType | StandardCompositeTokenValueType,
+  $type: StandardTokenTypes,
+  $extensions?: StandardTokenExtensionsInterface
+}
+```
+
+#### Standard deprecated (previous W3C draft)
+The standard format has been updated. To make migration easier, the old version was moved into standard deprecated.
+This version will be removed in the future, we highly encourage to update to the `standard` version.
+
+The only difference between this and the updated standard version is that the property keys of `value`, `type`,`description` and `extension` haven beend prefixed with a `$` in the new version.
+
 ```js
 type StandardTokenInterface = {
   name: string,

src/config/format.ts

@@ -0,0 +1,27 @@
+export type formatKeysType = {
+  VALUE: '$value' | 'value',
+  DESCRIPTION: '$description' | 'description',
+  TYPE: '$type' | 'type',
+  EXTENSIONS: '$extensions' | 'extensions',
+  NAME: 'name'
+}
+
+export const formatKeys: {
+  standardDeprecated: formatKeysType,
+  standard: formatKeysType
+} = {
+  standardDeprecated: {
+    VALUE: 'value',
+    DESCRIPTION: 'description',
+    TYPE: 'type',
+    EXTENSIONS: 'extensions',
+    NAME: 'name'
+  },
+  standard: {
+    VALUE: '$value',
+    DESCRIPTION: '$description',
+    TYPE: '$type',
+    EXTENSIONS: '$extensions',
+    NAME: 'name'
+  }
+}