Added stylesheets generation for lichess boards

scripts/utils/encode.ts

@@ -0,0 +1,12 @@
+import fs from "fs";
+import mime from "mime";
+
+const encode = (filePath: string) => {
+  const data = fs.readFileSync(filePath).toString("base64");
+
+  const type = mime.getType(filePath);
+
+  return `data:${type};base64,${data}`;
+};
+
+export default encode;