lets visualizations override gridConfig and tickSize

app/helpers/d3plusPropify.js

@@ -4,7 +4,7 @@ import {parse} from "utils/FUNC";
 export default (logic, formatters = {}, variables = {}) => {
 
   let config;
-  // The logic provided might be malformed. Wrap it in a try/catch to be sure we don't 
+  // The logic provided might be malformed. Wrap it in a try/catch to be sure we don't
   // crash / RSOD whatever page is making use of propify.
   try {
     config = parse({vars: ["variables"], logic}, formatters)(variables);
@@ -22,17 +22,17 @@ export default (logic, formatters = {}, variables = {}) => {
   // hides the non-discrete axis, if necessary
   const discrete = config.discrete || "x";
   const opposite = discrete === "x" ? "y" : "x";
-  config[`${discrete}Config`] = assign({}, config[`${discrete}Config`] || {}, {
+  config[`${discrete}Config`] = assign({
     gridConfig: {
       "stroke-width": 0
     },
     tickSize: 0
-  });
-  config[`${opposite}Config`] = assign({}, config[`${opposite}Config`] || {}, {
+  }, config[`${discrete}Config`] || {});
+  config[`${opposite}Config`] = assign({
     barConfig: {
       "stroke-width": 0
     }
-  });
+  }, config[`${opposite}Config`] || {});
 
   return {config, dataFormat};