From c2d38650e1c6ccfd9ef4b3afcf0fdef045b2c287 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rouven=20We=C3=9Fling?= <rouven@contentful.com>
Date: Sun, 1 Jul 2018 18:27:18 +0200
Subject: [PATCH 1/2] Remove dependency on exenv by inlining the relevant
 parts.

Makes the minified UMD build 10% (0.11 kB) smaller.
---
 package.json     | 1 -
 rollup.config.js | 2 +-
 src/index.js     | 9 +++++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/package.json b/package.json
index ef1db4c..b0f6cee 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,6 @@
     "react": "^0.13.0 || ^0.14.0 || ^15.0.0 || ^16.0.0"
   },
   "dependencies": {
-    "exenv": "^1.2.1",
     "shallowequal": "^1.0.1"
   },
   "devDependencies": {
diff --git a/rollup.config.js b/rollup.config.js
index ead3270..8970fcb 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -21,7 +21,7 @@ const config = {
       exclude: 'node_modules/**',
     }),
   ],
-  external: ['shallowequal', 'react', 'exenv'],
+  external: ['shallowequal', 'react'],
 }
 
 if (BUILD_FORMAT === 'umd') {
diff --git a/src/index.js b/src/index.js
index b224ec6..7d9da6a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,12 @@
 import React, { Component } from 'react';
-import ExecutionEnvironment from 'exenv';
 import shallowEqual from 'shallowequal';
 
+const canUseDOM = !!(
+  typeof window !== 'undefined' &&
+  window.document &&
+  window.document.createElement
+);
+
 export default function withSideEffect(
   reducePropsToState,
   handleStateChangeOnClient,
@@ -46,7 +51,7 @@ export default function withSideEffect(
       static displayName = `SideEffect(${getDisplayName(WrappedComponent)})`;
 
       // Expose canUseDOM so tests can monkeypatch it
-      static canUseDOM = ExecutionEnvironment.canUseDOM;
+      static canUseDOM = canUseDOM;
 
       static peek() {
         return state;

From 2b7c7eb977ce5db2e79e8b8b820db48d0a8f227c Mon Sep 17 00:00:00 2001
From: Louis DeScioli <descioli@google.com>
Date: Wed, 28 Aug 2019 17:52:20 -0400
Subject: [PATCH 2/2] Updates tests and lockfile for no exenv dependency

---
 test/index.spec.js | 3 +--
 yarn.lock          | 4 ----
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/test/index.spec.js b/test/index.spec.js
index 82d65ec..4fe9546 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -1,6 +1,5 @@
 const { expect } = require('chai');
 const React = require('react');
-const ExecutionEnvironment = require('exenv');
 const jsdom = require('jsdom');
 const { shallow, mount } = require('enzyme')
 const { renderToStaticMarkup } = require('react-dom/server')
@@ -81,7 +80,7 @@ describe('react-side-effect', () => {
     });
 
     it('should expose the canUseDOM flag', () => {
-      expect(SideEffect).to.have.property('canUseDOM', ExecutionEnvironment.canUseDOM);
+      expect(SideEffect).to.have.property('canUseDOM');
     });
 
     describe('rewind', () => {
diff --git a/yarn.lock b/yarn.lock
index f652fa0..ebd671b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1258,10 +1258,6 @@ esutils@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
 
-exenv@^1.2.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/exenv/-/exenv-1.2.1.tgz#75de1c8dee02e952b102aa17f8875973e0df14f9"
-
 expand-brackets@^0.1.4:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-0.1.5.tgz#df07284e342a807cd733ac5af72411e581d1177b"