fix: Buffer dependency (#8474)

* fix Buffer dependency

* moved to encode.ts

* move base64 parsing out

---------

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/data/encode.ts

@@ -57,6 +57,15 @@ export const base64ToString = async (base64: string, isByteString = false) => {
     : byteStringToString(window.atob(base64));
 };
 
+export const base64ToArrayBuffer = (base64: string): ArrayBuffer => {
+  if (typeof Buffer !== "undefined") {
+    // Node.js environment
+    return Buffer.from(base64, "base64").buffer;
+  }
+  // Browser environment
+  return byteStringToArrayBuffer(atob(base64));
+};
+
 // -----------------------------------------------------------------------------
 // text encoding
 // -----------------------------------------------------------------------------

packages/excalidraw/fonts/ExcalidrawFont.ts

@@ -1,4 +1,8 @@
-import { stringToBase64, toByteString } from "../data/encode";
+import {
+  base64ToArrayBuffer,
+  stringToBase64,
+  toByteString,
+} from "../data/encode";
 import { LOCAL_FONT_PROTOCOL } from "./metadata";
 import loadWoff2 from "./wasm/woff2.loader";
 import loadHbSubset from "./wasm/hb-subset.loader";
@@ -49,10 +53,7 @@ export class ExcalidrawFont implements Font {
 
       // it's dataurl (server), the font is inlined as base64, no need to fetch
       if (url.protocol === "data:") {
-        const arrayBuffer = Buffer.from(
+        const arrayBuffer = base64ToArrayBuffer(url.toString().split(",")[1]);
-          url.toString().split(",")[1],
-          "base64",
-        ).buffer;
 
         const base64 = await ExcalidrawFont.subsetGlyphsByCodePoints(
           arrayBuffer,