To over come the above problem convert Object Promise to String as below
var global_Full_Balance:string; await this.val_FullBalanceAmount.getText().then(async function (txt) { global_Full_Balance = txt; });
Java full stack tutorial
To over come the above problem convert Object Promise to String as below
var global_Full_Balance:string; await this.val_FullBalanceAmount.getText().then(async function (txt) { global_Full_Balance = txt; });