The installed version in the settings footer (@conduction/nextcloud-vue/webpack)

// webpack.config.js
const { appVersionDefine } = require('@conduction/nextcloud-vue/webpack')

new webpack.DefinePlugin({
	appVersion: appVersionDefine('myapp', readVersionFromInfoXml()),
})

// the controller that renders the app page
$this->initialState->provideInitialState(
	'version',
	$this->appConfig->getValueString('myapp', 'installed_version', ''),
);

@nextcloud/vue prints the app name and the appVersion global at the foot of every settings dialog. A version defined at build time is wrong on a release: the release workflow writes the release version into appinfo/info.xml after the bundle is built, so a 0.4.48-beta install read 0.4.47-unstable.

appVersionDefine() returns an expression instead of a literal. In the browser it reads the page's version initial state, the version Nextcloud installed. When the page provides none it returns the version you passed as fallback.