Fix DeepScan warnings

Author: garygong

utilities/warning/if-one-then-both-required-property.js

@@ -6,7 +6,7 @@
 // This function will deliver an error message to the browser console one property is used but not both that are required. Either use neither or both properties.
 import warning from 'warning';
 
-let ifOneThenBothRequiredProperty = function ifOneThenBothRequiredPropertyFunction() {};
+let ifOneThenBothRequiredProperty;
 
 if (process.env.NODE_ENV !== 'production') {
 	const hasWarned = {};

utilities/warning/one-of-required-property.js

@@ -6,7 +6,7 @@
 // This function will deliver an error message to the browser console when all of the props passed in are undefined (falsey).
 import warning from 'warning';
 
-let oneOfRequired = function oneOfRequiredFunction() {};
+let oneOfRequired;
 
 if (process.env.NODE_ENV !== 'production') {
 	const hasWarned = {};