[Home](./index.md) > [@firebase/analytics](./analytics.md) > [settings](./analytics.settings.md) ## settings() function Configures Firebase Analytics to use custom `gtag` or `dataLayer` names. Intended to be used if `gtag.js` script has been installed on this page independently of Firebase Analytics, and is using non-default names for either the `gtag` function or for `dataLayer`. Must be called before calling `getAnalytics()` or it won't have any effect. Signature: ```typescript export declare function settings(options: SettingsOptions): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | [SettingsOptions](./analytics.settingsoptions.md) | Custom gtag and dataLayer names. | Returns: void