message: Set default value for transformOptions
diff: @@ -17,7 +17,7 @@ export function process(
  src: string,
  path: string,
  config: JestConfig,
  - transformOptions: TransformOptions) {
  + transformOptions: TransformOptions = { instrument: false }) {
  if (tsJestConfig === undefined) {
  tsJestConfig = getTSJestConfig(config.globals);
  @@ -86,7 +86,7 @@ export function getCacheKey(
  fileData: string,
  filePath: Path,
  configStr: string,
  - options: TransformOptions): string {
  + options: TransformOptions = { instrument: false }): string {
  const jestConfig: JestConfig = JSON.parse(configStr);
  const tsConfig = getTSConfig(jestConfig.globals, options.instrument);
  