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Extending Multiple Interfaces

You can extend multiple interfaces at once:

type Character = {
  name: string;
  level: number;
};

interface Magical {
  mana: number;
  castSpell(spell: string): void;
}

interface Physical {
  strength: number;
  attack(): void;
}

interface BattleMage extends Character, Magical, Physical {
  combineAttacks(): void;
}

BattleMage now has all 7 properties and methods:

name
level
mana
castSpell
strength
attack
combineAttacks

Assignment

We want our support bots to be both conversational and autonomous. Combine the existing interfaces into one powerful bot interface.

Create and export an interface named SmartReplyBot that extends the three existing interfaces.
Add these properties to SmartReplyBot:

name: string
status: a value union of "online", "offline", or "starting"
shutdown: a method with no parameters that returns a string