chore: upgrade jest example to jest@17

replace the patch with setting enableSymlinks to true. ref: bazelbuild#2338

examples/jest/WORKSPACE

@@ -29,9 +29,7 @@ load("@build_bazel_rules_nodejs//:index.bzl", "yarn_install")
 
 yarn_install(
     name = "npm",
-    data = [
-        "//:patches/jest-haste-map+24.9.0.patch",
-    ],
+    exports_directories_only = True,
     package_json = "//:package.json",
     quiet = False,
     yarn_lock = "//:yarn.lock",

examples/jest/jest.config.js

@@ -2,6 +2,9 @@ const path = require('path');
 
 module.exports = {
   testEnvironment: 'node',
+  haste: {
+    enableSymlinks: true,
+  },
   reporters: ['default', './jest-reporter'],
   // explicitly specify the path to babel.config.js relative to jest.config.js so
   // jest can find it even when jest.config.js is not in the root folder of the workspace

examples/jest/jest.ts.config.js

@@ -1,5 +1,8 @@
 module.exports = {
   testEnvironment: 'node',
+  haste: {
+    enableSymlinks: true,
+  },
   reporters: ['default'],
   testMatch: ['**/*.test.js'],
   moduleNameMapper: {

examples/jest/package.json

@@ -6,17 +6,15 @@
         "@babel/core": "^7.6.0",
         "@babel/preset-env": "^7.6.0",
         "@bazel/typescript": "^3.6.0",
-        "@jest/core": "24.7.1",
-        "@jest/transform": "24.7.1",
-        "@types/jest": "^26.0.15",
-        "babel-jest": "24.7.1",
-        "babel-plugin-istanbul": "5.1.2",
-        "jest-cli": "24.9.0",
-        "patch-package": "^6.2.0",
+        "@jest/core": "27.0.3",
+        "@jest/transform": "27.0.2",
+        "@types/jest": "^26.0.23",
+        "babel-jest": "27.0.2",
+        "babel-plugin-istanbul": "6.0.0",
+        "jest-cli": "27.0.3",
         "typescript": "~4.2.0"
     },
     "scripts": {
-        "postinstall": "patch-package",
         "test": "bazel test ..."
     }
 }