Add custom Buffer polyfill for pre-ES2016 environments (stellar#118)

Author: overcat

buffer.js

@@ -0,0 +1,12 @@
+// See https://github.com/stellar/js-xdr/issues/117
+import { Buffer } from 'buffer';
+
+if (!(Buffer.alloc(1).subarray(0, 1) instanceof Buffer)) {
+  Buffer.prototype.subarray = function subarray(start, end) {
+    const result = Uint8Array.prototype.subarray.call(this, start, end);
+    Object.setPrototypeOf(result, Buffer.prototype);
+    return result;
+  };
+}
+
+export default Buffer;

webpack.config.js

@@ -47,7 +47,7 @@ module.exports = function () {
     };
     config.plugins.push(
       new webpack.ProvidePlugin({
-        Buffer: ['buffer', 'Buffer']
+        Buffer: [path.resolve(__dirname, 'buffer.js'), 'default']
       })
     );
   } else {