message: Set a default value for transformOptions
diff: @@ -10,7 +10,7 @@ const babelJest = require('babel-jest')
  plugins: ['transform-es2015-modules-commonjs']
  });
  -export function process(src, path, config, transformOptions) {
  +export function process(src, path, config, transformOptions: any = {}) {
  const root = require('pkg-dir').sync();
  // transformOptions.instrument is a proxy for collectCoverage
  // https://github.com/kulshekhar/ts-jest/issues/201#issuecomment-300572902
  