refactor: define clear type for compiler option in ts-jest config

e2e/__tests__/custom-compiler.test.ts

@@ -0,0 +1,20 @@
+import path from 'path'
+
+import { json as runWithJson } from '../run-jest'
+import { runNpmInstall } from '../utils'
+
+const DIR_NAME = 'custom-compiler'
+
+describe('ttypescript', () => {
+  const TTS_DIR_NAME = 'ttypescript'
+
+  beforeAll(() => {
+    runNpmInstall(path.join(__dirname, '..', DIR_NAME, TTS_DIR_NAME))
+  })
+
+  test(`successfully runs the tests inside ${DIR_NAME}/${TTS_DIR_NAME}`, () => {
+    const { json } = runWithJson(`${DIR_NAME}/${TTS_DIR_NAME}`)
+
+    expect(json.success).toBe(true)
+  })
+})

e2e/custom-compiler/ttypescript/__tests__/direct-import.spec.ts

@@ -0,0 +1,7 @@
+import { getWelcomeMessage } from '@share/foo'
+
+test('should return welcome message', () => {
+  const userName = 'github-user'
+
+  expect(getWelcomeMessage(userName)).toEqual(`yolo ${userName}`)
+})