babel
diff --git a/‎packages/babel-helper-function-name/package.json
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diff --git a/‎packages/babel-helper-function-name/src/index.ts
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diff --git a/‎packages/babel-helper-get-function-arity/.npmignore
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diff --git a/‎packages/babel-helper-get-function-arity/README.md
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diff --git a/‎packages/babel-helper-get-function-arity/package.json
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diff --git a/‎packages/babel-helper-get-function-arity/src/index.ts
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diff --git a/‎tsconfig.json
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diff --git a/‎yarn.lock
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@@ -14,7 +14,6 @@
   },
   "main": "./lib/index.js",
   "dependencies": {
-    "@babel/helper-get-function-arity": "workspace:^",
     "@babel/template": "workspace:^",
     "@babel/types": "workspace:^"
   },
 
@@ -1,23 +1,31 @@
-import getFunctionArity from "@babel/helper-get-function-arity";
 import template from "@babel/template";
 import {
   NOT_LOCAL_BINDING,
   cloneNode,
   identifier,
   isAssignmentExpression,
+  isAssignmentPattern,
   isFunction,
   isIdentifier,
   isLiteral,
   isNullLiteral,
   isObjectMethod,
   isObjectProperty,
   isRegExpLiteral,
+  isRestElement,
   isTemplateLiteral,
   isVariableDeclarator,
   toBindingIdentifierName,
 } from "@babel/types";
 import type * as t from "@babel/types";
 
+function getFunctionArity(node: t.Function): number {
+  const count = node.params.findIndex(
+    param => isAssignmentPattern(param) || isRestElement(param),
+  );
+  return count === -1 ? node.params.length : count;
+}
+
 const buildPropertyMethodAssignmentWrapper = template(`
   (function (FUNCTION_KEY) {
     function FUNCTION_ID() {
 
@@ -16,7 +16,6 @@
     "./packages/babel-helper-explode-assignable-expression/src/**/*.ts",
     "./packages/babel-helper-fixtures/src/**/*.ts",
     "./packages/babel-helper-function-name/src/**/*.ts",
-    "./packages/babel-helper-get-function-arity/src/**/*.ts",
     "./packages/babel-helper-hoist-variables/src/**/*.ts",
     "./packages/babel-helper-member-expression-to-functions/src/**/*.ts",
     "./packages/babel-helper-module-imports/src/**/*.ts",
@@ -190,9 +189,6 @@
       "@babel/helper-function-name": [
         "./packages/babel-helper-function-name/src"
       ],
-      "@babel/helper-get-function-arity": [
-        "./packages/babel-helper-get-function-arity/src"
-      ],
       "@babel/helper-hoist-variables": [
         "./packages/babel-helper-hoist-variables/src"
       ],
 
@@ -691,7 +691,6 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@babel/helper-function-name@workspace:packages/babel-helper-function-name"
   dependencies:
-    "@babel/helper-get-function-arity": "workspace:^"
     "@babel/template": "workspace:^"
     "@babel/types": "workspace:^"
   languageName: unknown
@@ -706,14 +705,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/helper-get-function-arity@workspace:^, @babel/helper-get-function-arity@workspace:packages/babel-helper-get-function-arity":
-  version: 0.0.0-use.local
-  resolution: "@babel/helper-get-function-arity@workspace:packages/babel-helper-get-function-arity"
-  dependencies:
-    "@babel/types": "workspace:^"
-  languageName: unknown
-  linkType: soft
-
 "@babel/helper-hoist-variables@npm:^7.15.4, @babel/helper-hoist-variables@npm:^7.16.7":
   version: 7.16.7
   resolution: "@babel/helper-hoist-variables@npm:7.16.7"