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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;
 }>