Fix handling of numeric gradient offsets, closes #827

lib/extract/extractGradient.js

@@ -9,7 +9,10 @@ import units from "../units";
 const percentReg = /^([+\-]?\d+(?:\.\d+)?(?:[eE][+\-]?\d+)?)(%?)$/;
 
 function percentToFloat(percent) {
-    const matched = percent.toString().match(percentReg);
+    if (typeof percent === 'number') {
+        return percent;
+    }
+    const matched = percent.match(percentReg);
     if (!matched) {
         console.warn(
             `\`${percent}\` is not a valid number or percentage string.`,
@@ -26,15 +29,18 @@ export default function(props) {
     }
 
     const stops = {};
-    Children.forEach(props.children, child => {
-        if (child.props.stopColor && child.props.offset) {
-            // convert percent to float.
-            const offset = percentToFloat(child.props.offset);
-
-            // add stop
+    Children.forEach(props.children, ({
+        props: {
+            offset,
+            stopColor,
+            stopOpacity,
+        }
+    }) => {
+        offset = percentToFloat(offset);
+        if (stopColor && !isNaN(offset)) {
             //noinspection JSUnresolvedFunction
-            stops[offset] = Color(child.props.stopColor).alpha(
-                extractOpacity(child.props.stopOpacity),
+            stops[offset] = Color(stopColor).alpha(
+                extractOpacity(stopOpacity),
             );
         }
     });