Add Babel + Jest config from Quilt

package.json

@@ -6,7 +6,7 @@
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts",
   "scripts": {
-    "test": "sk test",
+    "test": "jest",
     "build": "tsc"
   },
   "publishConfig": {
@@ -35,6 +35,8 @@
     "@types/koa": "^2.0.0",
     "@types/koa-compose": "*",
     "@types/safe-compare": "^1.1.0",
+    "babel-preset-shopify": "^21.0.0",
+    "jest": "^26.4.2",
     "koa": "^2.5.0",
     "node-fetch": "^2.6.0",
     "typescript": "^4.0.2"