Refactor to typescript (#158)

* Refactor to typescript

* Fix platform and workflow

* Fix workflow and platform

* Update husky and image-tag

* Use 'yarn lint-staged' instead of 'npx lint-staged'

src/model/unity-version-parser.test.ts

@@ -0,0 +1,25 @@
+import UnityVersionParser from './unity-version-parser';
+
+describe('UnityVersionParser', () => {
+  describe('parse', () => {
+    it('throws for empty string', () => {
+      expect(() => UnityVersionParser.parse('')).toThrow(Error);
+    });
+
+    it('parses from ProjectVersion.txt', () => {
+      const projectVersionContents = `m_EditorVersion: 2019.2.11f1
+      m_EditorVersionWithRevision: 2019.2.11f1 (5f859a4cfee5)`;
+      expect(UnityVersionParser.parse(projectVersionContents)).toBe('2019.2.11f1');
+    });
+  });
+
+  describe('read', () => {
+    it('throws for invalid path', () => {
+      expect(() => UnityVersionParser.read('')).toThrow(Error);
+    });
+
+    it('reads from unity-project-with-correct-tests', () => {
+      expect(UnityVersionParser.read('./unity-project-with-correct-tests')).toBe('2019.2.11f1');
+    });
+  });
+});