Switch to classes and ES6/esmodule TS compilation

__test__/city.test.ts

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+import City from '../src/city';
+
+const executeAllTests = () => {
+	describe('constructor', () => {
+		test('constructs a city', () => {
+			const city = new City('Foo', 'XX', 'XX', null, null);
+
+			expect(city).not.toBeNull();
+		});
+	});
+
+	describe('withinStateAndCountry', () => {
+		test('it finds cities', () => {
+			const lookupResult = City.withinStateAndCountry('DL', 'IN');
+			const names = lookupResult.map((city) => city.name);
+
+			expect(names).toEqual([
+				'Alīpur',
+				'Bawāna',
+				'Central Delhi',
+				'Delhi',
+				'Deoli',
+				'East Delhi',
+				'Karol Bāgh',
+				'Najafgarh',
+				'Narela',
+				'New Delhi',
+				'North Delhi',
+				'North East Delhi',
+				'North West Delhi',
+				'Nāngloi Jāt',
+				'Pitampura',
+				'Rohini',
+				'South Delhi',
+				'South West Delhi',
+				'West Delhi',
+			]);
+		});
+	});
+
+	describe('withinCountry', () => {
+		test('it finds cities', () => {
+			const lookupResult = City.withinCountry('TV');
+			const names = lookupResult.map((city) => city.name);
+
+			expect(names).toEqual([
+				'Alapi Village',
+				'Asau Village',
+				'Fakaifou Village',
+				'Funafuti',
+				'Kulia Village',
+				'Niulakita',
+				'Savave Village',
+				'Tanrake Village',
+				'Toga Village',
+			]);
+		});
+	});
+
+	describe('all', () => {
+		test('it gets all cities', () => {
+			const result = City.all();
+
+			expect(result).not.toBeNull();
+			expect(result[0]).not.toEqual([]);
+		});
+	});
+};
+
+export default executeAllTests;
+executeAllTests();

__test__/country.test.ts

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+import Country from '../src/country';
+
+const executeAllTests = () => {
+	describe('constructor', () => {
+		test('constructs a country', () => {
+			const country = new Country('Foo', '1', 'XX', 'FLAGEMOJI', '$', null, null, []);
+
+			expect(country).not.toBeNull();
+		});
+	});
+
+	describe('byIsoCode', () => {
+		test('it finds Canada', () => {
+			const lookupResult = Country.byIsoCode('CA');
+
+			expect(lookupResult).not.toBeNull();
+			expect(lookupResult!.name).toEqual('Canada');
+			expect(lookupResult!.isoCode).toEqual('CA');
+		});
+
+		test('it finds the USA', () => {
+			const lookupResult = Country.byIsoCode('US');
+
+			expect(lookupResult).not.toBeNull();
+			expect(lookupResult!.name).toEqual('United States');
+			expect(lookupResult!.isoCode).toEqual('US');
+		});
+
+		test('it returns null when not found', () => {
+			expect(Country.byIsoCode('XX')).toBeNull();
+		});
+	});
+
+	describe('all', () => {
+		test('it gets all countries', () => {
+			const result = Country.all();
+
+			expect(result).not.toBeNull();
+			expect(result[0]).not.toEqual([]);
+		});
+	});
+};
+
+export default executeAllTests;
+executeAllTests();