Update (#21)

* Modernize to ESM-only, require Node >=22, simplify code
* Update dependencies

Author: iredchuk

.github/workflows/node.js.yml

@@ -1,6 +1,3 @@
-# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
-
 name: Node.js CI
 
 on:
@@ -15,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [22.x, 24.x, 25.x]
 
     steps:
       - uses: actions/checkout@v4

.npmignore

@@ -1,6 +1,5 @@
 test/
 coverage/
-jest.config.js
 .gitattributes
 package-lock.json
 .github/

README.md

@@ -2,20 +2,12 @@
 
 Join two iterables (e.g. arrays) of objects by a common (user-defined) key, similarly to how SQL JOIN, LEFT JOIN and FULL JOIN work.
 
-[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
-
 ## Installation
 
 ```sh
 npm install array-join
 ```
 
-or
-
-```sh
-yarn add array-join
-```
-
 ## Usage
 
 `join(leftCollection, rightCollection, getLeftKey, getRightKey, getResultItem)`
@@ -141,14 +133,19 @@ will include non-matching items from both collections
   {
     left: { id: 3, name: 'Alice' },
     right: undefined
-  }
+  },
   {
     left: undefined,
-    right:{ personId: 4, address: { city: 'London', country: 'UK' } }
+    right: { personId: 4, address: { city: 'London', country: 'UK' } }
   }
 ]
 ```
 
+## Breaking changes in version 4
+
+- ESM-only package (CommonJS is no longer supported)
+- Minimum Node.js version is 22
+
 ## Breaking changes in version 3
 
 - Rewritten on TypeScript (which ensures typings to be correct)