How to set a class type to a variable?

Question

typescript

hello, I am rewriting back from java to nodeJS
In the java code, I often encounter such variables:
Trade_account trade_account;

after digging in the code, I realized that the 'trade_account' variable was assigned the class type 'Trade_account'.
And hence the actual question, is it possible to specify the type of a class in typescript variables?

Answer 1

Yes.

let trade_account: Trade_account | null | undefined; // явно указываем, что тип переменной - это undefined или Trade_account или null