Rewrite for PHP 8.3, add Firestore support

.gitattributes

@@ -1,18 +1,12 @@
 # Enforce Unix newlines
 * text=lf
 
-# Exclude unused files
-# see: https://redd.it/2jzp6k
-/example            export-ignore
-/docs               export-ignore
+# Keep development files out of the installed package
+/.github            export-ignore
 /tests              export-ignore
-/.codeclimate.yml   export-ignore
-/.coveralls.yml     export-ignore
-/.editorconfig      export-ignore
 /.gitattributes     export-ignore
 /.gitignore         export-ignore
-/.travis.yml        export-ignore
-/CONTRIBUTING.md    export-ignore
-/README.md          export-ignore
-/phpcs.xml          export-ignore
-/phpunit.xml.dist   export-ignore
+/.php-cs-fixer.dist.php export-ignore
+/phpstan.neon.dist  export-ignore
+/phpunit.xml.dist   export-ignore
+/UPGRADING.md       export-ignore

.github/workflows/ci.yml

@@ -0,0 +1,58 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  tests:
+    name: Tests on PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['8.3', '8.4', '8.5']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: ctype, filter, json, mbstring
+          coverage: none
+
+      - uses: ramsey/composer-install@v3
+
+      - run: vendor/bin/phpunit
+
+  static-analysis:
+    name: Static analysis
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          coverage: none
+
+      - uses: ramsey/composer-install@v3
+
+      - run: vendor/bin/phpstan analyse --no-progress --memory-limit=1G
+
+  coding-standards:
+    name: Coding standards
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          coverage: none
+
+      - uses: ramsey/composer-install@v3
+
+      - run: vendor/bin/php-cs-fixer fix --dry-run --diff

.gitignore

@@ -1,4 +1,6 @@
-build
-html
-vendor
-composer.lock
+/vendor/
+/composer.lock
+/.phpunit.cache/
+/.php-cs-fixer.cache
+/build/
+.phpactor.json

.php-cs-fixer.dist.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+$finder = PhpCsFixer\Finder::create()->in([__DIR__.'/src', __DIR__.'/tests']);
+
+return (new PhpCsFixer\Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PSR12' => true,
+        '@PHP83Migration' => true,
+        'declare_strict_types' => true,
+        'ordered_imports' => ['sort_algorithm' => 'alpha'],
+        'no_unused_imports' => true,
+        'single_quote' => true,
+        'trailing_comma_in_multiline' => ['elements' => ['arrays', 'arguments', 'parameters']],
+    ])
+    ->setFinder($finder);