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Apps

Official reference: ISteamApps.

apps is synchronous and reads the running Steam application context.

  • Ownership and installation: isSubscribed(), isSubscribedApp(appId), isAppInstalled(appId), and isDlcInstalled(appId).
  • DLC changes: installDlc(appId) and uninstallDlc(appId) request a state change. Observe the dlc-installed callback event before treating an install as ready.
  • App metadata: getAppBuildId(), getCurrentGameLanguage(), getAvailableGameLanguages(), and getLaunchCommandLine().
  • Paths and indexed records: getCurrentGameInstallDir(), getAppInstallDir(appId), and getDlcDataByIndex(index) return null when Steam has no value. Iterate indexes from 0 to getDlcCount() - 1.
for (let index = 0; index < apps.getDlcCount(); index++) {
	const dlc = apps.getDlcDataByIndex(index);
	if (dlc?.available && !apps.isDlcInstalled(dlc.appId)) {
		apps.installDlc(dlc.appId);
	}
}

Use the current app ID from utils.getAppId() rather than embedding it in consumer code when the app may run under multiple Steam configurations.