feat(util): add warnOnce and deprecated fns

TheSharpieOne · TheSharpieOne · commit 5faa94d9796b · 2017-08-16T13:08:09.000-04:00
Add deprected util to mark prop-types as deprected
Add warnOnce to display a message in the console, never the same message twice
diff --git a/src/utils.js b/src/utils.js
@@ -167,3 +167,24 @@ export function omit(obj, omitKeys) {
   });
   return result;
 }
+
+let warned = {};
+
+export function warnOnce(message) {
+  if (!warned[message]) {
+    if (typeof console !== 'undefined') {
+      console.error(message); // eslint-disable-line no-console
+    }
+    warned[message] = true;
+  }
+}
+
+export function deprecated(propType, explanation) {
+  return function validate(props, propName, componentName, ...rest) {
+    if (props[propName] !== null && typeof props[propName] !== 'undefined') {
+      warnOnce(`"${propName}" property of "${componentName}" has been deprecated.\n${explanation}`);
+    }
+
+    return propType(props, propName, componentName, ...rest);
+  };
+}
