first commit

tests/__mocks__/fileMock.ts

@@ -0,0 +1 @@
+export default '';

tests/__mocks__/styleMock.ts

@@ -0,0 +1 @@
+export default {};

tests/__mocks__/workerMock.ts

@@ -0,0 +1,5 @@
+export default jest.fn().mockImplementation(() => ({
+  postMessage: jest.fn(),
+  onmessage: jest.fn(),
+  onerror: jest.fn(),
+}));