Update prefetching (#74)

* 100% test coverage

* some cleanup

* Added configureServiceWorker

* Update __NEXT_DATA__ for api versioning.

* Reverted unnecessary changes.

* 100% test coverage

* Allow developers to configure a query param to be added to all prefetch reqeuests.

* fix setting prefetch query param

* revert breaking change

* Bump version to 8.

* rerun tests

Author: markbrocato

jest.config.js

@@ -4,14 +4,19 @@ module.exports = {
   setupFiles: ['./test/config/setup.js'],
   setupFilesAfterEnv: ['./test/config/mocks.js', './node_modules/jest-enzyme/lib/index.js'],
   collectCoverage: true,
-  collectCoverageFrom: ['./src/**/*.{js,jsx}', './service-worker/*.{js,jsx}', '!**/index.js'],
+  collectCoverageFrom: [
+    './src/**/*.{js,jsx}',
+    './service-worker/*.{js,jsx}',
+    '!./src/plugins/*',
+    '!**/index.js',
+  ],
   moduleNameMapper: {
     'react-storefront/(.*)': '<rootDir>/src/$1',
   },
   transform: {
     '.*': './test/config/babelTransformer.js',
   },
   transformIgnorePatterns: [
-    'node_modules/(?!(workbox-expiration|workbox-core|workbox-routing|workbox-strategies|workbox-precaching)/)'
+    'node_modules/(?!(workbox-expiration|workbox-core|workbox-routing|workbox-strategies|workbox-precaching)/)',
   ],
 }