remove code for old Node from jest config

jest.config.js

@@ -3,14 +3,6 @@
 const ENABLE_TEST_RESULTS = !!process.env.ENABLE_TEST_RESULTS;
 const ENABLE_CODE_COVERAGE = !!process.env.ENABLE_CODE_COVERAGE;
 
-const requiresPrettierInternals = [
-  "tests_integration/__tests__/util-shared.js",
-  "tests_integration/__tests__/help-options.js"
-];
-
-const semver = require("semver");
-const isOldNode = semver.parse(process.version).major <= 4;
-
 module.exports = {
   setupFiles: ["<rootDir>/tests_config/run_spec.js"],
   snapshotSerializers: [
@@ -18,9 +10,7 @@ module.exports = {
     "jest-snapshot-serializer-ansi"
   ],
   testRegex: "jsfmt\\.spec\\.js$|__tests__/.*\\.js$",
-  testPathIgnorePatterns: ["tests/new_react", "tests/more_react"].concat(
-    isOldNode ? requiresPrettierInternals : []
-  ),
+  testPathIgnorePatterns: ["tests/new_react", "tests/more_react"],
   collectCoverage: ENABLE_CODE_COVERAGE,
   collectCoverageFrom: ["src/**/*.js", "index.js", "!<rootDir>/node_modules/"],
   coveragePathIgnorePatterns: [