signal.ts

interface ISlot<T, U> {
	(sender: T, args: U): void;
}


class Signal<T, U> {
	
	connect(slot: ISlot<T, U>): void {
		
	}
	
	disconnect(slot: ISlot<T, U>): void {
		
	}
	
	emit(sender: T, args: U): void {
		
	}
}


// Example

class MyClass {
	
	changed = new Signal<this, void>();
	textChanged = new Signal<this, string>();
	tabMoved = new Signal<this, { fromIndex: number, toIndex: number }>();
		
	doThing(): void {
		// ...
		this.changed.emit(this, void 0);
	}
	
	setText(text: string): void {
		// ...
		this.textChanged.emit(this, text);
	}
	
	moveTab(fromIndex: number, toIndex: number) {
		// ...
		this.tabMoved.emit(this, { fromIndex }); // error - missing argument
		this.tabMoved.emit(this, { fromIndex, toIndex });
	}
}