Example composer file for Wordpress & WooCommerce

composer.json

{
	"name" : "githubuser/projectname",
	"description" : "Project Name",
	"type" : "project",
	"license" : "GPL",
	"authors" : [{
			"name" : "Your Name"
		}
	],
	"repositories" : [{
			"type" : "composer",
			"url" : "https://wpackagist.org"
		}, {
			"type" : "composer",
			"url" : "https://packagist.org"
		}
	],
	"minimum-stability" : "dev",
	"prefer-stable" : true,
	"prefer-source" : true,
	"config" : {
		"sort-packages" : true,
		"optimize-autoloader" : true,
		"platform" : {
			"php" : "7.3"
		}
	},
	"require" : {
		"composer/installers" : "^1.2",
		"drupal-composer/preserve-paths" : "dev-master",
		"johnpbloch/wordpress-core" : "5.2.3",
		"johnpbloch/wordpress-core-installer" : "^1.0",
		"symfony/console" : "^4.2",
		"vlucas/phpdotenv" : "^3.3@dev",
		"wpackagist-plugin/advanced-custom-fields" : "^5.8",
		"wpackagist-plugin/disable-json-api" : "^1.4",
		"wpackagist-plugin/maintenance" : "^3.6",
		"wpackagist-plugin/manage-notification-emails" : "^1.4",
		"wpackagist-plugin/woocommerce" : "^3.7",
		"wpackagist-plugin/wp-crontrol" : "^1.7",
		"wpackagist-plugin/wp-fastest-cache" : "0.8.9.4"
  },
	"extra" : {
		"installer-paths" : {
			"web/wp-content/plugins/{$name}/" : [
				"type:wordpress-plugin"
			],
			"web/wp-content/themes/{$name}/" : [
				"type:wordpress-theme"
			]
		},
		"preserve-paths" : [
			"web/wp-config.php",
			"web/wp-content/uploads",
			"web/wp-content/cache",
			"web/assets",
			"web/wp-content/languages",
			"web/wp-content/plugins/perfmatters"
		],
		"wordpress-install-dir" : "web"
	},
	"require-dev" : {
		"phpmd/phpmd" : "^2.6",
		"squizlabs/php_codesniffer" : "^3.3"
	}
}