[Refactor]: prop-types: avoid using an underscore to mean "internal"

Author: ljharb

lib/rules/prop-types.js

@@ -84,7 +84,7 @@ module.exports = {
      * @param {String[]} keyList Dot separated name of the prop to check.
      * @returns {Boolean} True if the prop is declared, false if not.
      */
-    function _isDeclaredInComponent(declaredPropTypes, keyList) {
+    function internalIsDeclaredInComponent(declaredPropTypes, keyList) {
       for (let i = 0, j = keyList.length; i < j; i++) {
         const key = keyList[i];
         const propType = (
@@ -120,7 +120,7 @@ module.exports = {
           const unionPropType = {};
           for (let k = 0, z = unionTypes.length; k < z; k++) {
             unionPropType[key] = unionTypes[k];
-            const isValid = _isDeclaredInComponent(
+            const isValid = internalIsDeclaredInComponent(
               unionPropType,
               keyList.slice(i)
             );
@@ -148,7 +148,7 @@ module.exports = {
         const component = components.get(node);
 
         const isDeclared = component && component.confidence === 2 &&
-          _isDeclaredInComponent(component.declaredPropTypes || {}, names);
+          internalIsDeclaredInComponent(component.declaredPropTypes || {}, names);
         if (isDeclared) {
           return true;
         }