You should use mongodb driver to execute mongo scripts. Also since you're using typescript you should also install mongo types. Read the docs about mongodb nodejs driver. It's really easy to use.
Also functions like printjosn or ISODate do not exist in javascript.

1. Instead ISODate("2020-01-01T00:00:00.174Z") you should use new Date("2020-01-01T00:00:00.174Z")
2. Instead of printjson(res) use ether console.log(res) or console.log(JSON.stringify(res, null, 2))

You can't use Typescript in this file, because you run it with mongo shell, which doesn't support Typescript.

If you'd like to use Typescript in this file, you'll have to compile it with tsc and then run the resulting JS file in mongo shell.

This will be tricky, because I couldn't find any ready-made type definitions for things such as db.createUser and printjson, which means that you'll have to define these types by yourself, not ideal IMO.

As suggested by Serhiy Mamedov, you can instead use mongodb package from npm with appropriate types from DT in order to create new user, drop collection, etc.

Essentially, I suggest you rewrite the script from mongo shell environment to NodeJS environment, where you'll have ready-made quality type definitions.

As you can see in this question OP was trying to use createUser() function from mongo shell environment inside NodeJS environment, and failed. Because in NodeJS environment the same function is called addUser().

if you are looking to execute above commands in mongo shell then you may have javascript file with below contents:

var createUserResult = db.createUser({
    user: "admin",
    pwd: "password",
    roles: [
        {
            role: "readWrite",
            db: "authStarterDB",
        },
    ],
});
print("createUserResult:", JSON.stringify(createUserResult));

// Create testing data
// User - email: test@gmail.com, username: test, psw: qweqweqwe
//
var dropUserResult = db.users.drop();
print('dropUserResult:', JSON.stringify(dropUserResult));

var emailIndexResult = db.users.createIndex({ email: 1 }, { unique: true });
print('emailIndexResult:', JSON.stringify(emailIndexResult));
var usernameIndexResult = db.users.createIndex({ username: 1 }, { unique: true });
print('usernameIndexResult:', JSON.stringify(usernameIndexResult));
var userInsertResult = db.users.insert({
    email: "test@gmail.com",
    username: "test",
    salt: "62a633a7a64abd1909c69aa78259cff1258dd335c8c7a453de09e6801cd46b36",
    hash:
        "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",
    createdAt: ISODate("2020-01-01T00:00:00.174Z"),
    updatedAt: ISODate("2020-01-01T00:00:00.174Z"),
});

print("userInsertResult:", JSON.stringify(userInsertResult));

Then you may use load command to execute the script like load('script.js')

hope this helps, if still looking for something else then pls let me know will try to see if I could help!