From e5afc18cda3ea035d199c7f7652a3a80f86069a3 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Wed, 6 Dec 2017 20:24:23 +0100
Subject: [PATCH 1/3] Pass in encoding to `realpath` call

Fixes #5030
---
 packages/jest-cli/src/cli/index.js              | 2 +-
 packages/jest-runtime/src/script_transformer.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/jest-cli/src/cli/index.js b/packages/jest-cli/src/cli/index.js
index f35011d53b49..a8262501025a 100644
--- a/packages/jest-cli/src/cli/index.js
+++ b/packages/jest-cli/src/cli/index.js
@@ -144,7 +144,7 @@ const getProjectListFromCLIArgs = (argv, project: ?Path) => {
   if (!projects.length && process.platform === 'win32') {
     try {
       // $FlowFixMe
-      projects.push(process.binding('fs').realpath(process.cwd()));
+      projects.push(process.binding('fs').realpath(process.cwd(), 'utf8'));
     } catch (err) {
       // do nothing, just catch error
       // process.binding('fs').realpath can throw, e.g. on mapped drives
diff --git a/packages/jest-runtime/src/script_transformer.js b/packages/jest-runtime/src/script_transformer.js
index 504af27eb089..71c7368deb16 100644
--- a/packages/jest-runtime/src/script_transformer.js
+++ b/packages/jest-runtime/src/script_transformer.js
@@ -185,7 +185,7 @@ export default class ScriptTransformer {
   _getRealPath(filepath: Path): Path {
     try {
       // $FlowFixMe
-      return process.binding('fs').realpath(filepath) || filepath;
+      return process.binding('fs').realpath(filepath, 'utf8') || filepath;
     } catch (err) {
       return filepath;
     }

From 69265daff733ad3eb834e5130f2d3e096f960d52 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Wed, 6 Dec 2017 20:42:34 +0100
Subject: [PATCH 2/3] Use `fs.realpathSync.native` if it exists

---
 packages/jest-cli/src/cli/index.js              |  4 ++--
 packages/jest-runtime/src/script_transformer.js |  5 ++---
 packages/jest-util/src/index.js                 | 11 +++++++++++
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/packages/jest-cli/src/cli/index.js b/packages/jest-cli/src/cli/index.js
index a8262501025a..750a84494827 100644
--- a/packages/jest-cli/src/cli/index.js
+++ b/packages/jest-cli/src/cli/index.js
@@ -15,6 +15,7 @@ import {
   Console,
   clearLine,
   createDirectory,
+  realpath,
   validateCLIOptions,
 } from 'jest-util';
 import {readConfig} from 'jest-config';
@@ -143,8 +144,7 @@ const getProjectListFromCLIArgs = (argv, project: ?Path) => {
 
   if (!projects.length && process.platform === 'win32') {
     try {
-      // $FlowFixMe
-      projects.push(process.binding('fs').realpath(process.cwd(), 'utf8'));
+      projects.push(realpath(process.cwd()));
     } catch (err) {
       // do nothing, just catch error
       // process.binding('fs').realpath can throw, e.g. on mapped drives
diff --git a/packages/jest-runtime/src/script_transformer.js b/packages/jest-runtime/src/script_transformer.js
index 71c7368deb16..248a42a97635 100644
--- a/packages/jest-runtime/src/script_transformer.js
+++ b/packages/jest-runtime/src/script_transformer.js
@@ -17,7 +17,7 @@ import type {
 import crypto from 'crypto';
 import path from 'path';
 import vm from 'vm';
-import {createDirectory} from 'jest-util';
+import {createDirectory, realpath} from 'jest-util';
 import fs from 'graceful-fs';
 import {transform as babelTransform} from 'babel-core';
 import babelPluginIstanbul from 'babel-plugin-istanbul';
@@ -184,8 +184,7 @@ export default class ScriptTransformer {
 
   _getRealPath(filepath: Path): Path {
     try {
-      // $FlowFixMe
-      return process.binding('fs').realpath(filepath, 'utf8') || filepath;
+      return realpath(filepath) || filepath;
     } catch (err) {
       return filepath;
     }
diff --git a/packages/jest-util/src/index.js b/packages/jest-util/src/index.js
index 859398dd5bc4..528cb81a626b 100644
--- a/packages/jest-util/src/index.js
+++ b/packages/jest-util/src/index.js
@@ -8,6 +8,7 @@
  */
 
 import mkdirp from 'mkdirp';
+import fs from 'fs';
 
 import BufferedConsole from './buffered_console';
 import clearLine from './clear_line';
@@ -30,6 +31,15 @@ const createDirectory = (path: string) => {
   }
 };
 
+const realpath = (filepath: string) => {
+  if (typeof fs.realpathSync.native === 'function') {
+    return fs.realpathSync.native(filepath);
+  }
+
+  // $FlowFixMe: This is need for node@<9.2
+  return process.binding('fs').realpath(filepath, 'utf8');
+};
+
 module.exports = {
   BufferedConsole,
   Console,
@@ -40,6 +50,7 @@ module.exports = {
   formatTestResults,
   getConsoleOutput,
   installCommonGlobals,
+  realpath,
   setGlobal,
   validateCLIOptions,
 };

From 227f33452dc7eaedd37348b736fefed55ad88b6b Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Wed, 6 Dec 2017 20:47:17 +0100
Subject: [PATCH 3/3] update changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44945b22f8e2..34e0a007cb4f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@
   ([#4494](https://github.com/facebook/jest/pull/4494))
 * `[jest-cli]` Throw if `maxWorkers` doesn't have a value
   ([#4591](https://github.com/facebook/jest/pull/4591))
+* `[jest-cli]` Use `fs.realpathSync.native` if available
+  ([#5031](https://github.com/facebook/jest/pull/5031))
 * `[jest-config]` Fix `--passWithNoTests`
   ([#4639](https://github.com/facebook/jest/pull/4639))
 * `[jest-config]` Support `rootDir` tag in testEnvironment