diff --git a/packages/babel-helper-function-name/package.json b/packages/babel-helper-function-name/package.json
index 73a0222b3c82..01943b4a5ebb 100644
--- a/packages/babel-helper-function-name/package.json
+++ b/packages/babel-helper-function-name/package.json
@@ -14,7 +14,6 @@
   },
   "main": "./lib/index.js",
   "dependencies": {
-    "@babel/helper-get-function-arity": "workspace:^",
     "@babel/template": "workspace:^",
     "@babel/types": "workspace:^"
   },
diff --git a/packages/babel-helper-function-name/src/index.ts b/packages/babel-helper-function-name/src/index.ts
index 09dd4c61bd53..fc157b28be35 100644
--- a/packages/babel-helper-function-name/src/index.ts
+++ b/packages/babel-helper-function-name/src/index.ts
@@ -1,10 +1,10 @@
-import getFunctionArity from "@babel/helper-get-function-arity";
 import template from "@babel/template";
 import {
   NOT_LOCAL_BINDING,
   cloneNode,
   identifier,
   isAssignmentExpression,
+  isAssignmentPattern,
   isFunction,
   isIdentifier,
   isLiteral,
@@ -12,12 +12,20 @@ import {
   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() {
diff --git a/packages/babel-helper-get-function-arity/.npmignore b/packages/babel-helper-get-function-arity/.npmignore
deleted file mode 100644
index f9806945836e..000000000000
--- a/packages/babel-helper-get-function-arity/.npmignore
+++ /dev/null
@@ -1,3 +0,0 @@
-src
-test
-*.log
diff --git a/packages/babel-helper-get-function-arity/README.md b/packages/babel-helper-get-function-arity/README.md
deleted file mode 100644
index ca7f8b120b44..000000000000
--- a/packages/babel-helper-get-function-arity/README.md
+++ /dev/null
@@ -1,19 +0,0 @@
-# @babel/helper-get-function-arity
-
-> Helper function to get function arity
-
-See our website [@babel/helper-get-function-arity](https://babeljs.io/docs/en/babel-helper-get-function-arity) for more information.
-
-## Install
-
-Using npm:
-
-```sh
-npm install --save @babel/helper-get-function-arity
-```
-
-or using yarn:
-
-```sh
-yarn add @babel/helper-get-function-arity
-```
diff --git a/packages/babel-helper-get-function-arity/package.json b/packages/babel-helper-get-function-arity/package.json
deleted file mode 100644
index e25397d37469..000000000000
--- a/packages/babel-helper-get-function-arity/package.json
+++ /dev/null
@@ -1,35 +0,0 @@
-{
-  "name": "@babel/helper-get-function-arity",
-  "version": "7.16.7",
-  "description": "Helper function to get function arity",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/babel/babel.git",
-    "directory": "packages/babel-helper-get-function-arity"
-  },
-  "homepage": "https://babel.dev/docs/en/next/babel-helper-get-function-arity",
-  "license": "MIT",
-  "publishConfig": {
-    "access": "public"
-  },
-  "main": "./lib/index.js",
-  "dependencies": {
-    "@babel/types": "workspace:^"
-  },
-  "engines": {
-    "node": ">=6.9.0"
-  },
-  "author": "The Babel Team (https://babel.dev/team)",
-  "conditions": {
-    "BABEL_8_BREAKING": [
-      null,
-      {
-        "exports": null
-      }
-    ]
-  },
-  "exports": {
-    ".": "./lib/index.js",
-    "./package.json": "./package.json"
-  }
-}
diff --git a/packages/babel-helper-get-function-arity/src/index.ts b/packages/babel-helper-get-function-arity/src/index.ts
deleted file mode 100644
index 96176b1fe329..000000000000
--- a/packages/babel-helper-get-function-arity/src/index.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { isAssignmentPattern, isRestElement } from "@babel/types";
-import type * as t from "@babel/types";
-
-export default function (node: t.Function): number {
-  const params = node.params;
-  for (let i = 0; i < params.length; i++) {
-    const param = params[i];
-    if (isAssignmentPattern(param) || isRestElement(param)) {
-      return i;
-    }
-  }
-  return params.length;
-}
diff --git a/tsconfig.json b/tsconfig.json
index f0cb0df8795a..6238556a7f0d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -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"
       ],
diff --git a/yarn.lock b/yarn.lock
index 788a41e02609..a9e4eb9e9e7b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -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"