feat: expose fontfamily and refactor FONT_FAMILY (#3710)

* feat: expose fontfamily and refactor FONT_FAMILY for better readability

* fix

* fix

* fix

* docs

* fix

src/packages/excalidraw/CHANGELOG.md

@@ -19,6 +19,8 @@ Please add the latest change on the top under the correct section.
 
 ### Features
 
+- Expose [`FONT_FAMILY`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#FONT_FAMILY) so that consumer can use when passing `initialData.appState.currentItemFontFamily`.
+
 - Added prop [`autoFocus`](https://github.com/excalidraw/excalidraw/blob/master/src/packages/excalidraw/README.md#autoFocus) to focus the excalidraw component on page load when enabled, defaults to false [#3691](https://github.com/excalidraw/excalidraw/pull/3691).
 
   Note: Earlier Excalidraw component was focussed by default on page load, you need to enable `autoFocus` prop to retain the same behaviour.

src/packages/excalidraw/README_NEXT.md

@@ -840,3 +840,21 @@ This function returns a svg with the exported elements.
 | exportBackground | boolean | true | Indicates whether background should be exported |
 | viewBackgroundColor | string | #fff | The default background color |
 | exportWithDarkMode | boolean | false | Indicates whether to export with dark mode |
+
+### FONT_FAMILY
+
+**_Signature_**
+
+```js
+import { FONT_FAMILY } from "./constants";
+```
+
+`FONT_FAMILY` contains all the font families used in `Excalidraw` as explained below
+
+| Font Family | Description          |
+| ----------- | -------------------- |
+| Virgil      | The handwritten font |
+| Helvetica   | The Normal Font      |
+| Cacadia     | The Code Font        |
+
+Defaults to `FONT_FAMILY.Virgil` unless passed in `initialData.appState.currentItemFontFamily`.

src/packages/excalidraw/index.tsx

@@ -180,3 +180,4 @@ export {
   exportToSvg,
 } from "../../packages/utils";
 export { serializeAsJSON } from "../../data/json";
+export { FONT_FAMILY } from "../../constants";