Upgrade dev dependencies

- Babel deps
- Jest
- Eslint
- Migrate from yarn to npm
- Migrate from Travis to GitHub Actions

.babelrc

@@ -1,3 +1,3 @@
 {
-    "presets": ["es2015"]
+    "presets": ["@babel/preset-env"]
 }

.eslintrc.js → .eslintrc.json

@@ -1,10 +1,16 @@
-module.exports = {
+{
     "env": {
-        "es6": true,
+        "es2021": true,
         "node": true,
         "jest": true
     },
     "extends": "eslint:recommended",
+    "overrides": [
+    ],
+    "parserOptions": {
+        "ecmaVersion": "latest",
+        "sourceType": "module"
+    },
     "rules": {
         "indent": [
             "error",
@@ -25,8 +31,5 @@ module.exports = {
         "no-console": [
             "warn"
         ]
-    },
-    "parserOptions": {
-        "sourceType": "module"
     }
-};
+}

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI for Identifiers
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [23, 22, 20, 18]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests
+        run: npm test

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2017 Altmetric LLP
+Copyright (c) 2017-2024 Altmetric LLP
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,9 +1,9 @@
-# Identifiers - PubMed ID [![Build Status](https://travis-ci.org/altmetric/identifiers-pubmed.svg?branch=master)](https://travis-ci.org/altmetric/identifiers-pubmed)
+# Identifiers - PubMed ID
 
 Extract, validate and normalize [PubMed IDs](http://www.ncbi.nlm.nih.gov/pubmed).
 
 **Current version:** 0.1.1  
-**Supported Node.js versions:** 4, 5, 6, 7
+**Supported Node.js versions:** 18, 20, 22, 23
 
 ## Installation
 
@@ -28,6 +28,6 @@ We also maintain versions of this library for [Ruby](https://github.com/altmetri
 
 ## License
 
-Copyright © 2017 Altmetric LLP
+Copyright © 2017-2024 Altmetric LLP
 
 Distributed under the [MIT License](http://opensource.org/licenses/MIT).