transform ES modules in node_modules

config/jest.config.js

@@ -5,4 +5,14 @@ module.exports = {
   collectCoverage: Boolean(process.env.COVERAGE),
   collectCoverageFrom: ['<rootDir>/src/**/*.ts?(x)'],
   coveragePathIgnorePatterns: ['generated'],
+  /**
+   * Since we use a lot of denepencies as ES moules, we need configure
+   * jest to transform the files in node_modules which export as
+   * ES modules.
+   * The list can be very long if we enumerate dependencies as a whitelist,
+   * so we use a blacklist to ignore certain dependencies that should
+   * not be transformed.
+   * This may cause performance issue.
+   */
+  transformIgnorePatterns: [`/node_modules/(jest|@testing-library)`],
 };