chore: remove Node 8 references and some dead code (#9284)

* chore: remove Node 8 references and some dead code

* import async hooks normally

* bump node to 8.3 because V8 6.0 with Turbofan and better perf

* update comments in pretty-format

Author: thymikee

docs/CLI.md

@@ -158,7 +158,7 @@ Print debugging info about your Jest config.
 
 ### `--detectOpenHandles`
 
-Attempt to collect and print open handles preventing Jest from exiting cleanly. Use this in cases where you need to use `--forceExit` in order for Jest to exit to potentially track down the reason. This implies `--runInBand`, making tests run serially. Implemented using [`async_hooks`](https://nodejs.org/api/async_hooks.html), so it only works in Node 8 and newer. This option has a significant performance penalty and should only be used for debugging.
+Attempt to collect and print open handles preventing Jest from exiting cleanly. Use this in cases where you need to use `--forceExit` in order for Jest to exit to potentially track down the reason. This implies `--runInBand`, making tests run serially. Implemented using [`async_hooks`](https://nodejs.org/api/async_hooks.html). This option has a significant performance penalty and should only be used for debugging.
 
 ### `--env=<environment>`
 

jest.config.ci.js

@@ -7,8 +7,8 @@
 
 'use strict';
 
-// Object spread is just node 8
-module.exports = Object.assign({}, require('./jest.config'), {
+module.exports = {
+  ...require('./jest.config'),
   coverageReporters: ['json'],
   reporters: [
     [
@@ -17,4 +17,4 @@ module.exports = Object.assign({}, require('./jest.config'), {
     ],
     ['jest-silent-reporter', {useDots: true}],
   ],
-});
+};

package.json

@@ -144,6 +144,6 @@
     "logo": "https://opencollective.com/jest/logo.txt"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   }
 }

packages/babel-jest/package.json

@@ -26,7 +26,7 @@
     "@babel/core": "^7.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/babel-plugin-jest-hoist/package.json

@@ -7,7 +7,7 @@
     "directory": "packages/babel-plugin-jest-hoist"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",

packages/babel-preset-jest/package.json

@@ -17,7 +17,7 @@
     "@babel/core": "^7.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/diff-sequences/package.json

@@ -16,7 +16,7 @@
     "diff"
   ],
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "main": "build/index.js",
   "types": "build/index.d.ts",

packages/eslint-config-fb-strict/package.json

@@ -20,7 +20,7 @@
     "eslint-plugin-react": "^7.1.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/expect/package.json

@@ -22,7 +22,7 @@
     "immutable": "^4.0.0-rc.12"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-changed-files/package.json

@@ -15,7 +15,7 @@
     "throat": "^5.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-circus/package.json

@@ -36,7 +36,7 @@
     "jest-runtime": "^24.9.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-cli/package.json

@@ -29,7 +29,7 @@
     "jest": "./bin/jest.js"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "repository": {
     "type": "git",

packages/jest-config/package.json

@@ -34,7 +34,7 @@
     "@types/micromatch": "^3.1.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-console/package.json

@@ -16,7 +16,7 @@
     "slash": "^3.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-core/package.json

@@ -42,7 +42,7 @@
     "@types/rimraf": "^2.0.2"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "repository": {
     "type": "git",

packages/jest-core/src/collectHandles.ts

@@ -5,13 +5,12 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import * as asyncHooks from 'async_hooks';
 import {Config} from '@jest/types';
 import {formatExecError} from 'jest-message-util';
 import {ErrorWithStack} from 'jest-util';
 import stripAnsi = require('strip-ansi');
 
-type AsyncHook = import('async_hooks').AsyncHook;
-
 function stackIsFromUser(stack: string) {
   // Either the test file, or something required by it
   if (stack.includes('Runtime.requireModule')) {
@@ -43,58 +42,43 @@ export default function collectHandles(): () => Array<Error> {
     number,
     {error: Error; isActive: () => boolean}
   > = new Map();
-
-  let hook: AsyncHook;
-
-  try {
-    const asyncHooks: typeof import('async_hooks') = require('async_hooks');
-    hook = asyncHooks.createHook({
-      destroy(asyncId) {
-        activeHandles.delete(asyncId);
-      },
-      init: function initHook(
-        asyncId,
-        type,
-        _triggerAsyncId,
-        resource: {} | NodeJS.Timeout,
-      ) {
-        if (type === 'PROMISE' || type === 'TIMERWRAP') {
-          return;
-        }
-        const error = new ErrorWithStack(type, initHook);
-
-        if (stackIsFromUser(error.stack || '')) {
-          let isActive: () => boolean;
-
-          if (type === 'Timeout' || type === 'Immediate') {
-            if ('hasRef' in resource) {
-              // Timer that supports hasRef (Node v11+)
-              isActive = resource.hasRef.bind(resource);
-            } else {
-              // Timer that doesn't support hasRef
-              isActive = alwaysActive;
-            }
+  const hook = asyncHooks.createHook({
+    destroy(asyncId) {
+      activeHandles.delete(asyncId);
+    },
+    init: function initHook(
+      asyncId,
+      type,
+      _triggerAsyncId,
+      resource: {} | NodeJS.Timeout,
+    ) {
+      if (type === 'PROMISE' || type === 'TIMERWRAP') {
+        return;
+      }
+      const error = new ErrorWithStack(type, initHook);
+
+      if (stackIsFromUser(error.stack || '')) {
+        let isActive: () => boolean;
+
+        if (type === 'Timeout' || type === 'Immediate') {
+          if ('hasRef' in resource) {
+            // Timer that supports hasRef (Node v11+)
+            isActive = resource.hasRef.bind(resource);
           } else {
-            // Any other async resource
+            // Timer that doesn't support hasRef
             isActive = alwaysActive;
           }
-
-          activeHandles.set(asyncId, {error, isActive});
+        } else {
+          // Any other async resource
+          isActive = alwaysActive;
         }
-      },
-    });
-
-    hook.enable();
-  } catch (e) {
-    const nodeMajor = Number(process.versions.node.split('.')[0]);
-    if (e.code === 'MODULE_NOT_FOUND' && nodeMajor < 8) {
-      throw new Error(
-        'You can only use --detectOpenHandles on Node 8 and newer.',
-      );
-    } else {
-      throw e;
-    }
-  }
+
+        activeHandles.set(asyncId, {error, isActive});
+      }
+    },
+  });
+
+  hook.enable();
 
   return () => {
     hook.disable();

packages/jest-diff/package.json

@@ -19,7 +19,7 @@
     "strip-ansi": "^6.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-docblock/package.json

@@ -12,7 +12,7 @@
     "detect-newline": "^3.0.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-each/package.json

@@ -25,7 +25,7 @@
     "pretty-format": "^24.9.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-environment-jsdom/package.json

@@ -21,7 +21,7 @@
     "@types/jsdom": "^12.2.4"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-environment-node/package.json

@@ -17,7 +17,7 @@
     "jest-util": "^24.9.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-environment/package.json

@@ -15,7 +15,7 @@
     "jest-mock": "^24.9.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-fake-timers/package.json

@@ -20,7 +20,7 @@
     "@types/lolex": "^5.1.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-get-type/package.json

@@ -8,7 +8,7 @@
     "directory": "packages/jest-get-type"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",

packages/jest-haste-map/package.json

@@ -32,7 +32,7 @@
     "fsevents": "^2.1.2"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-jasmine2/package.json

@@ -32,7 +32,7 @@
     "@types/babel__traverse": "^7.0.4"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-leak-detector/package.json

@@ -18,7 +18,7 @@
     "weak-napi": "^1.0.3"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "publishConfig": {
     "access": "public"

packages/jest-matcher-utils/package.json

@@ -8,7 +8,7 @@
     "directory": "packages/jest-matcher-utils"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",

packages/jest-message-util/package.json

@@ -7,7 +7,7 @@
     "directory": "packages/jest-message-util"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",

packages/jest-mock/package.json

@@ -7,7 +7,7 @@
     "directory": "packages/jest-mock"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "dependencies": {
     "@jest/types": "^24.9.0"

packages/jest-phabricator/package.json

@@ -11,7 +11,7 @@
     "@jest/test-result": "^24.9.0"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",

packages/jest-regex-util/package.json

@@ -7,7 +7,7 @@
     "directory": "packages/jest-regex-util"
   },
   "engines": {
-    "node": ">= 8"
+    "node": ">= 8.3"
   },
   "license": "MIT",
   "main": "build/index.js",