fix: support undefined of propertyMap[thisMember]

Author: tyankatsu0105

lib/rules/no-use-computed-property-like-method.js

@@ -63,7 +63,7 @@ const getPrototypeType = (obj) =>
 /**
  * Get return type of property.
  * @param {{ property: ComponentPropertyData, propertyMap?: PropertyMap }} args
- * @returns {{type: string | null}}
+ * @returns {{type: string | null | 'ReturnStatementHasNotArgument'}}
  */
 const getValueType = ({ property, propertyMap }) => {
   if (property.type === 'array') {
@@ -94,7 +94,9 @@ const getValueType = ({ property, propertyMap }) => {
         )
 
         if (!returnStatement || returnStatement.type !== 'ReturnStatement')
-          return
+          return {
+            type: null
+          }
 
         if (returnStatement.argument === null)
           return {
@@ -231,7 +233,12 @@ module.exports = {
 
         const thisMember = node.parent.property.name
 
-        if (!propertyMap[thisMember].valueType.type) return
+        if (
+          !propertyMap[thisMember] ||
+          !propertyMap[thisMember].valueType ||
+          !propertyMap[thisMember].valueType.type
+        )
+          return
 
         if (
           propertyMap[thisMember].groupName === 'computed' &&