IndexMap compatibility issue fixed (#24)

.github/workflows/build.yml

@@ -0,0 +1,59 @@
+name: Build
+
+on:
+  pull_request:
+    branches:
+      - '*'
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform-reqs:
+          - use-platform-reqs
+        php-version:
+          - "7.3"
+          - "7.4"
+          - "8.0"
+        dependencies:
+          - lowest
+          - highest
+        include:
+          - php-version: "8.1"
+            platform-reqs: ignore-platform-reqs
+            dependencies: highest
+          - php-version: "8.1"
+            platform-reqs: ignore-platform-reqs
+            dependencies: lowest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+
+      - name: Install lowest dependencies
+        if: ${{ matrix.dependencies == 'lowest' && matrix.platform-reqs == 'use-platform-reqs' }}
+        run: composer update --no-interaction --prefer-lowest
+
+      - name: Install lowest dependencies (ignore platform reqs)
+        if: ${{ matrix.dependencies == 'lowest' && matrix.platform-reqs == 'ignore-platform-reqs' }}
+        run: composer update --no-interaction --prefer-lowest --ignore-platform-reqs
+
+      - name: Install highest dependencies
+        if: ${{ matrix.dependencies == 'highest' && matrix.platform-reqs == 'use-platform-reqs' }}
+        run: composer update --no-interaction
+
+      - name: Install highest dependencies (ignore platform reqs)
+        if: ${{ matrix.dependencies == 'highest' && matrix.platform-reqs == 'ignore-platform-reqs' }}
+        run: composer update --no-interaction --ignore-platform-reqs
+
+      - name: Run tests
+        run: composer test

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Fixed
+- PHP 8.1 compatibility issue ([#24](./issues/24)).
+
 ## [0.7.5] - 2021-04-10
 ### Fixed
 - Closure moved out from generated query code to prevent memory leak (see https://bugs.php.net/bug.php?id=76982).

composer.json

@@ -16,17 +16,17 @@
     }
   ],
   "require": {
-    "php": "^7.3 | ^8",
+    "php": "^7.3 || ^8",
     "ext-intl": "*",
     "ext-json": "*",
-    "remorhaz/php-unilex": "^0.4",
+    "remorhaz/php-unilex": "^0.4.1",
     "remorhaz/php-json-data": "^0.5.3",
-    "nikic/php-parser": "^4.10"
+    "nikic/php-parser": "^4.12"
   },
   "require-dev": {
+    "infection/infection": "^0.18 || ^0.19 || ^0.20 || ^0.21 || ^0.22 || ^0.23 || ^0.24",
     "phpunit/phpunit": "^9.5",
-    "squizlabs/php_codesniffer": "^3.5",
-    "infection/infection": "^0.18"
+    "squizlabs/php_codesniffer": "^3.6"
   },
   "autoload": {
     "psr-4": {

docker-compose.yml

@@ -22,3 +22,10 @@ services:
     volumes:
       - .:/app
     working_dir: /app
+  php8.1:
+    build:
+      context: .
+      dockerfile: php-8.1.Dockerfile
+    volumes:
+      - .:/app
+    working_dir: /app

php-8.1.Dockerfile

@@ -0,0 +1,19 @@
+FROM php:8.1-rc-cli
+
+RUN apt-get update &&  apt-get install -y \
+    zip \
+    git \
+    libicu-dev && \
+    pecl install -f -o xdebug && \
+    docker-php-ext-enable xdebug && \
+    docker-php-ext-configure intl --enable-intl && \
+    docker-php-ext-install intl && \
+    echo "xdebug.mode = develop,coverage,debug" >> "$PHP_INI_DIR/conf.d/docker-php-ext-xdebug.ini" && \
+    echo "xdebug.max_nesting_level = 1024" >> "$PHP_INI_DIR/conf.d/docker-php-ext-xdebug.ini"
+
+
+ENV COMPOSER_ALLOW_SUPERUSER=1 \
+    COMPOSER_PROCESS_TIMEOUT=1200
+
+RUN curl --silent --show-error https://getcomposer.org/installer | php -- \
+    --install-dir=/usr/bin --filename=composer

src/Value/IndexMap.php

@@ -4,6 +4,8 @@
 
 namespace Remorhaz\JSON\Path\Value;
 
+use ReturnTypeWillChange;
+
 use function array_keys;
 use function count;
 use function in_array;
@@ -18,6 +20,7 @@ public function __construct(?int ...$outerIndexes)
         $this->outerIndexes = $outerIndexes;
     }
 
+    #[ReturnTypeWillChange]
     public function count()
     {
         return count($this->outerIndexes);