"JavaScript/TypeScript: The Importance of Defining Object Return Types

While going through the Tour of Heroes tutorial for Angular, I found this method of returning an object to be confusing.

 createDb() {
 const heroes = [
   { id: 11, name: 'Dr Nice' },
   { id: 12, name: 'Narco' },
   { id: 13, name: 'Bombasto' },
   { id: 14, name: 'Celeritas' },
   { id: 15, name: 'Magneta' },
   { id: 16, name: 'RubberMan' },
   { id: 17, name: 'Dynama' },
   { id: 18, name: 'Dr IQ' },
   { id: 19, name: 'Magma' },
   { id: 20, name: 'Tornado' }
 ];
 return {heroes}; // <-- exactly what does this line do?
}

Wouldn't it make more sense to write return {'heroes': heroes} ? What is the terminology for this type of syntax?

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