/// class Compound extends Infrastructure { constructor () { super('Compounds', 'Provides space for tents and houses and a place to hide more money.'); this.cost.money = 15000; this._costMultiplier.money = 1.5; } public isUnlocked (state: GameState): boolean { if (this._isUnlocked) return true; const tents: IResource = state.getResource('tents'); if (tents.value >= 5) { this._isUnlocked = true; } return this._isUnlocked; } }