Revert "UX-373 Upgrade styled-components to 5.2 (#686)" (#688)

This reverts commit b683fd4.

babel.config.js

@@ -12,10 +12,7 @@ module.exports = {
         '@babel/preset-react',
         'react-app',
       ],
-      plugins: [
-        '@babel/plugin-proposal-class-properties',
-        ['babel-plugin-styled-components', { ssr: true, displayName: false, namespace: 'sc-' }],
-      ],
+      plugins: ['@babel/plugin-proposal-class-properties'],
     },
     production: {
       presets: [['@babel/preset-env'], '@babel/preset-react', 'react-app'],

config/jest/setup.js

@@ -2,8 +2,8 @@
 import './raf';
 import Enzyme from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
-import * as matchers from './matchers';
-import 'jest-styled-components';
+import toJson from 'enzyme-to-json';
+import * as matchers from './matchers'
 
 // Provides enzyme assertions.
 // See https://github.com/blainekasten/enzyme-matchers#assertions
@@ -14,7 +14,7 @@ expect.extend(matchers);
 Enzyme.configure({ adapter: new Adapter() });
 
 // Fail tests on any warning
-console.error = message => {
+console.error = (message) => {
   throw new Error(message);
 };
 

jest.config.json

@@ -30,7 +30,6 @@
     "^react-native$": "react-native-web",
     "\\.(css|scss)$": "identity-obj-proxy",
     "@sparkpost/matchbox-icons(.*)": "<rootDir>/packages/matchbox-icons/src",
-    "@sparkpost/matchbox(.*)": "<rootDir>/packages/matchbox/src",
-    "^styled-components": "<rootDir>/node_modules/styled-components"
+    "@sparkpost/matchbox(.*)": "<rootDir>/packages/matchbox/src"
   }
 }