[Home](./index.md) > [@firebase/app](./app.md) > [registerVersion](./app.registerversion.md) ## registerVersion() function Registers a library's name and version for platform logging purposes. Signature: ```typescript export declare function registerVersion(libraryKeyOrName: string, version: string, variant?: string): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | libraryKeyOrName | string | | | version | string | Current version of that library. | | variant | string | Bundle variant, e.g., node, rn, etc. | Returns: void