Remove is-image because it contains arrow function (codesandbox#317)

Author: CompuIves

packages/app/package.json

@@ -129,7 +129,7 @@
     "gulp-rev": "^7.1.2",
     "hash-sum": "^1.0.2",
     "humps": "CompuIves/humps",
-    "is-image": "^2.0.0",
+    "image-extensions": "^1.1.0",
     "jszip": "^3.1.3",
     "lodash": "^4.17.2",
     "match-sorter": "^1.8.1",

packages/app/src/app/components/sandbox/CodeEditor/index.js

@@ -1,15 +1,16 @@
 import React from 'react';
 import Loadable from 'react-loadable';
 
+import path from 'path';
+import imageExtensions from 'image-extensions/image-extensions.json';
+
 import Loading from 'app/components/Loading';
 import Title from 'app/components/text/Title';
 import SubTitle from 'app/components/text/SubTitle';
 import Centered from 'common/components/flex/Centered';
 import Margin from 'common/components/spacing/Margin';
 import { Preferences, Module, Directory } from 'common/types';
 
-import isImage from 'is-image';
-
 import Monaco from './Monaco';
 import ImageViewer from './ImageViewer';
 
@@ -27,6 +28,15 @@ const CodeMirror = Loadable({
   LoadingComponent: Loading,
 });
 
+const exts = new Set(imageExtensions);
+const isImage = filepath =>
+  exts.has(
+    path
+      .extname(filepath)
+      .slice(1)
+      .toLowerCase()
+  );
+
 export default (props: Props) => {
   const module = props.modules.find(m => m.id === props.id);
 

yarn.lock

@@ -6830,7 +6830,7 @@ ignore@^3.3.3:
   version "3.3.7"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.3.7.tgz#612289bfb3c220e186a58118618d5be8c1bab021"
 
-image-extensions@^1.0.1:
+image-extensions@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/image-extensions/-/image-extensions-1.1.0.tgz#b8e6bf6039df0056e333502a00b6637a3105d894"
 
@@ -7198,12 +7198,6 @@ is-gzip@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-gzip/-/is-gzip-1.0.0.tgz#6ca8b07b99c77998025900e555ced8ed80879a83"
 
-is-image@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/is-image/-/is-image-2.0.0.tgz#454c9569578de31869371fbfaea4958f461b3e0c"
-  dependencies:
-    image-extensions "^1.0.1"
-
 is-installed-globally@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/is-installed-globally/-/is-installed-globally-0.1.0.tgz#0dfd98f5a9111716dd535dda6492f67bf3d25a80"