🔧 Initial development environment setup

.gitattributes

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+#
+# Exclude these files from release archives.
+# This will also make them unavailable when using Composer with `--prefer-dist`.
+# If you develop for this repo using Composer, use `--prefer-source`.
+# https://www.reddit.com/r/PHP/comments/2jzp6k/i_dont_need_your_tests_in_my_production
+# https://blog.madewithlove.be/post/gitattributes/
+#
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.travis.yml export-ignore
+
+#
+# Auto detect text files and perform LF normalization
+# http://davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+#
+* text=auto
+
+#
+# The above will handle all files NOT found below
+#
+*.md text
+*.php text
+*.inc text

.gitignore

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+vendor/
+composer.lock

.travis.yml

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+dist: trusty
+
+language: php
+
+## Cache composer and apt downloads.
+cache:
+  directories:
+    # Cache directory for older Composer versions.
+    - $HOME/.composer/cache/files
+    # Cache directory for more recent Composer versions.
+    - $HOME/.cache/composer/files
+
+php:
+  - 5.4
+  - 7.3
+
+jobs:
+  fast_finish: true
+
+
+before_install:
+  # Speed up build time by disabling Xdebug when its not needed.
+  - phpenv config-rm xdebug.ini || echo 'No xdebug config.'
+
+  # --prefer-dist will allow for optimal use of the travis caching ability.
+  - composer install --prefer-dist --no-suggest
+
+
+script:
+  # Validate the composer.json file on low/high PHP versions.
+  # @link https://getcomposer.org/doc/03-cli.md#validate
+  - composer validate --no-check-all --strict

composer.json

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+{
+    "name" : "phpcsstandards/phpcsdevtools",
+    "description" : "Tools for PHP_CodeSniffer sniff developers.",
+    "type" : "phpcodesniffer-standard",
+    "keywords" : [ "phpcs", "devtools", "php_codesniffer" ],
+    "license" : "LGPL-3.0-or-later",
+    "authors" : [
+        {
+            "name" : "Juliette Reinders Folmer",
+            "role" : "lead",
+            "homepage" : "https://github.com/jrfnl"
+        },
+        {
+            "name" : "Contributors",
+            "homepage" : "https://github.com/PHPCSStandards/PHPCSDevTools/graphs/contributors"
+        }
+    ],
+    "support" : {
+        "issues" : "https://github.com/PHPCSStandards/PHPCSDevTools/issues",
+        "source" : "https://github.com/PHPCSStandards/PHPCSDevTools"
+    },
+    "require" : {
+        "php" : ">=5.4",
+        "squizlabs/php_codesniffer" : "^3.0.2",
+        "dealerdirect/phpcodesniffer-composer-installer" : "^0.5"
+    },
+    "require-dev" : {
+        "roave/security-advisories" : "dev-master",
+        "jakub-onderka/php-parallel-lint": "^1.0",
+        "jakub-onderka/php-console-highlighter": "^0.4"
+    },
+    "scripts" : {
+        "lint": [
+            "@php ./vendor/jakub-onderka/php-parallel-lint/parallel-lint . -e php --exclude vendor"
+        ]
+    }
+}