fix: fix ESLint v9 compatibility (#292)

Author: MichaelDeBoey

src/get-function-head-location.mjs

@@ -46,9 +46,10 @@ export function getFunctionHeadLocation(node, sourceCode) {
         start = arrowToken.loc.start
         end = arrowToken.loc.end
     } else if (
-        parent.type === "Property" ||
-        parent.type === "MethodDefinition" ||
-        parent.type === "PropertyDefinition"
+        parent &&
+        (parent.type === "Property" ||
+            parent.type === "MethodDefinition" ||
+            parent.type === "PropertyDefinition")
     ) {
         start = /** @type {SourceLocation} */ (parent.loc).start
         end = getOpeningParenOfParams(node, sourceCode).loc.start

src/get-function-name-with-kind.mjs

@@ -15,6 +15,11 @@ import { getPropertyName } from "./get-property-name.mjs"
 // eslint-disable-next-line complexity
 export function getFunctionNameWithKind(node, sourceCode) {
     const parent = /** @type {RuleNode} */ (node).parent
+
+    if (!parent) {
+        return ""
+    }
+
     const tokens = []
     const isObjectMethod = parent.type === "Property" && parent.value === node
     const isClassMethod =

src/is-parenthesized.mjs

@@ -17,6 +17,10 @@ import { isClosingParenToken, isOpeningParenToken } from "./token-predicate.mjs"
 function getParentSyntaxParen(node, sourceCode) {
     const parent = /** @type {RuleNode} */ (node).parent
 
+    if (!parent) {
+        return null
+    }
+
     switch (parent.type) {
         case "CallExpression":
         case "NewExpression":

src/reference-tracker.mjs

@@ -350,6 +350,9 @@ export class ReferenceTracker {
         }
 
         const parent = /** @type {RuleNode} */ (node).parent
+        if (!parent) {
+            return
+        }
         if (parent.type === "MemberExpression") {
             if (parent.object === node) {
                 const key = getPropertyName(parent)