How to expand the Start task with new scenarios - serenity-bdd

Question

I've just learned about serenity-js and am giving it a go. I'm following the tutorial and noticed the follow example:
james.attemptsTo(
Start.withAnEmptyTodoList(),
AddATodoItem.called('Buy some milk')
)
The task for Start:
export class Start implements Task {
static withATodoListContaining(items: string[]) { // static method to improve the readability
return new Start(items);
}
performAs(actor: PerformsTasks): PromiseLike<void> { // required by the Task interface
return actor.attemptsTo( // delegates the work to lower-level tasks
// todo: add each item to the Todo List
);
}
constructor(private items: string[]) { // constructor assigning the list of items
} // to a private field
}
I really like this syntax and would like to continue this setup with more starting scenario's.
What would be the proper approach to accomplish this?

Answer 1

For anyone having the same question this is how I resolved it (found a similar setup going through the serenity-js repo):
// Start.ts
export class Start {
public static withATodoListContaining = (items: string[]): StartWithATodoListContaining => new StartWithATodoListContaining(items);
}
// StartWithATodoListContaining.ts
export class StartWithATodoListContaining implements Task {
static withATodoListContaining(items: string[]) {
return new StartWithATodoListContaining(items);
}
performAs(actor: PerformsTasks): PromiseLike<void> {
return actor.attemptsTo(
// todo: add each item to the Todo List
);
}
constructor(private items: string[]) {
}
}