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Stacks.js 
 
Function fetchUsernameForAccountByDerivationType
 
- fetchUsernameForAccountByDerivationType(opts): Promise<{ 
    username: undefined | string; 
}> 
- 
Parameters
- 
opts: { 
    derivationType: Wallet | Data; 
    index: number; 
    network?: StacksNetwork | "mainnet" | "testnet" | "devnet" | "mocknet"; 
    rootNode: HDKey; 
} & ApiParam
 
 
Returns Promise<{ 
    username: undefined | string; 
}>