Add non-default exports for better ES module support

Author: silentmatt

index.js

@@ -12,7 +12,13 @@
 import { Expression } from './src/expression';
 import { Parser } from './src/parser';
 
-export default {
+export {
+  Expression,
+  Parser
+};
+
+// Backwards compatibility
+export default{
   Parser: Parser,
   Expression: Expression
 };

rollup.config.js

@@ -3,7 +3,8 @@ export default {
   output: {
     file: 'dist/bundle.js',
     format: 'umd',
-    name: 'exprEval'
+    name: 'exprEval',
+    exports: 'named'
   },
   plugins: []
 };