Do not use ReactPropTypesLocationNames.

src/utils/propTypeRequiredWrapper.js

@@ -1,16 +1,13 @@
 const checkRequiredThenValidate = (validator) =>
     (props, propName, componentName, location) =>
 {
-    if (props[propName] !== null) {
+    if (props[propName] != null) {
         return validator(props, propName, componentName, location);
     }
 
-    /* global ReactPropTypesLocationNames */ // Pacify ESLint
-    const location_name = ReactPropTypesLocationNames[location];
-
     return new Error(
         `Required prop \`${propName}\` was not specified in ` +
-        `\`${componentName}\`. Check the render method of \`${location_name}\`.`
+        `\`${componentName}\`.`
     );
 };