From 71bdfe3c105e05fcfa3cca2018611e3380ff3ae0 Mon Sep 17 00:00:00 2001
From: Gregory Desfour <gregory.desfour@accedo.tv>
Date: Sun, 14 May 2017 01:52:15 +0800
Subject: [PATCH] `checkPropTypes`: Friendlier message when using a type
 checker that is not a function

---
 checkPropTypes.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/checkPropTypes.js b/checkPropTypes.js
index 49111df..1ad29fe 100644
--- a/checkPropTypes.js
+++ b/checkPropTypes.js
@@ -53,7 +53,8 @@ function checkPropTypes(typeSpecs, values, location, componentName, getStack) {
           if (typeof typeSpecs[typeSpecName] !== 'function') {
             var err = Error(
               (componentName || 'React class') + ': ' + location + ' type `' + typeSpecName + '` is invalid; ' +
-              'it must be a function, usually from the `prop-types` package, but received `' + typeof typeSpecs[typeSpecName] + '`.'
+              'it must be a function, usually from the `prop-types` package, but received `' + typeof typeSpecs[typeSpecName] + '`.' +
+              'This often happens because of typos such as `PropTypes.function` instead of `PropTypes.func`.'
             );
             err.name = 'Invariant Violation';
             throw err;