From 6f4ae5113df3c0ca26b4957a9aec6c811b85b257 Mon Sep 17 00:00:00 2001
From: microJ <microJ@users.noreply.github.com>
Date: Thu, 4 Jun 2020 13:54:28 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20browser=E7=AB=AF,=E5=B0=86=20is-type-of?=
 =?UTF-8?q?=20=E5=8C=85=E7=9A=84=E4=BE=9D=E8=B5=96=E5=A4=84=E7=90=86?=
 =?UTF-8?q?=E4=B8=BA=20shim=20(#801)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .prettierrc         |  9 +++++++++
 package.json        |  3 ++-
 shims/is-type-of.js | 22 ++++++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 .prettierrc
 create mode 100644 shims/is-type-of.js

diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 000000000..6ed6b425e
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,9 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "useTabs": false,
+  "printWidth": 80,
+  "bracketSpacing": true,
+  "arrowParens": "avoid"
+}
diff --git a/package.json b/package.json
index 957a05281..c6f9b822c 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,8 @@
     "utility": "./shims/utility.js",
     "crypto": "./shims/crypto/crypto.js",
     "fs": false,
-    "child_process": false
+    "child_process": false,
+    "is-type-of": "./shims/is-type-of.js"
   },
   "scripts": {
     "build-change-log": "standard-version",
diff --git a/shims/is-type-of.js b/shims/is-type-of.js
new file mode 100644
index 000000000..3880a3e3e
--- /dev/null
+++ b/shims/is-type-of.js
@@ -0,0 +1,22 @@
+const { Stream } = require('stream');
+const isArray = require('../lib/common/utils/isArray');
+
+module.exports.string = function isString(obj) {
+  return typeof obj === 'string';
+};
+
+module.exports.array = isArray;
+
+module.exports.buffer = Buffer.isBuffer;
+
+function isStream(obj) {
+  return obj instanceof Stream;
+}
+
+module.exports.writableStream = function isWritableStream(obj) {
+  return (
+    isStream(obj) &&
+    typeof obj._write === 'function' &&
+    typeof obj._writableState === 'object'
+  );
+};