Example composer.json and DDEV config.yaml for a TYPO3 CMS extension, running in a local environment

README.md

$ ddev start
$ ddev composer install
$ ddev composer run typo3

• URL: https://my-ext.ddev.site/typo3/
• User: admin
• Password: password (same for install tool)

composer.json

{
    "name": "vendor/my-ext",
    "type": "typo3-cms-extension",
    "keywords": [
        "TYPO3",
        "extension"
    ],
    "homepage": "https://v.ieweg.de",
    "authors": [
        {
            "name": "Armin Vieweg",
            "role": "Developer",
            "email": "[email protected]",
            "homepage": "https://v.ieweg.de"
        }
    ],
    "license": [
        "GPL-2.0-or-later"
    ],
    "require": {
        "typo3/cms-core": "^10.4.2"
    },
    "require-dev": {
        "t3/cms": "^10.4"
    },
    "autoload": {
        "psr-4": {
            "Vendor\\MyExt\\": "Classes"
        }
    },
    "replace": {
        "typo3-ter/my-ext": "self.version"
    },
    "config": {
        "platform": {
            "php": "7.4.9"
        },
        "vendor-dir": ".Build/vendor",
        "bin-dir": ".Build/bin"
    },
    "extra": {
        "typo3/cms": {
            "extension-key": "my_ext",
            "cms-package-dir": "{$vendor-dir}/typo3/cms",
            "web-dir": ".Build/public",
            "app-dir": ".Build"
        }
    },
    "scripts": {
        "post-autoload-dump": [
            "@typo3-cleanup"
        ],
        "typo3": [
            "@typo3-install",
            "@typo3-setup",
            "@typo3-cleanup"
        ],
        "typo3-install": [
            "@putenv TYPO3_INSTALL_DB_DRIVER=mysqli",
            "@putenv TYPO3_INSTALL_DB_HOST=db",
            "@putenv TYPO3_INSTALL_DB_NAME=typo3",
            "@putenv TYPO3_INSTALL_DB_PORT=3306",
            "@putenv TYPO3_INSTALL_DB_USER=root",
            "@putenv TYPO3_INSTALL_DB_PASSWORD=root",
            "@putenv TYPO3_INSTALL_DB_USE_EXISTING=0",
            "@putenv TYPO3_INSTALL_WEB_SERVER_CONFIG=apache",
            "@putenv TYPO3_INSTALL_SITE_SETUP_TYPE=site",
            "@putenv TYPO3_INSTALL_SITE_NAME=EXT:my_ext Dev Environment",
            "@putenv TYPO3_INSTALL_ADMIN_USER=admin",
            "@putenv TYPO3_INSTALL_ADMIN_PASSWORD=password",
            "typo3cms install:setup -n --database-name=typo3",
            "ln -s /var/www/html/ /var/www/html/.Build/public/typo3conf/ext/my_ext"
        ],
        "typo3-setup": [
            "typo3cms configuration:set 'BE/debug' 1",
            "typo3cms configuration:set 'FE/debug' 1",
            "typo3cms configuration:set 'SYS/devIPmask' '*'",
            "typo3cms configuration:set 'SYS/displayErrors' 1",
            "typo3cms configuration:set 'SYS/trustedHostsPattern' '.*.*'",
            "typo3cms configuration:set 'MAIL/transport' 'smtp'",
            "typo3cms configuration:set 'MAIL/transport_smtp_server' 'localhost:1025'",
            "typo3cms configuration:set 'GFX/processor' 'ImageMagick'",
            "typo3cms configuration:set 'GFX/processor_path' '/usr/bin/'",
            "typo3cms configuration:set 'GFX/processor_path_lzw' '/usr/bin/'"
        ],
        "typo3-cleanup": [
            "typo3cms install:generatepackagestates",
            "typo3cms cache:flush"
        ]
    }
}

config.yaml

# .ddev/config.yaml
name: my-ext
type: php
docroot: ./.Build/public/
php_version: "7.4"
webserver_type: apache-fpm
router_http_port: "80"
router_https_port: "443"
xdebug_enabled: false
additional_hostnames: []
additional_fqdns: []
provider: default
use_dns_when_possible: true
working_dir:
    web: /var/www/html/.Build