remove the spotify dependency

jest.config.js

@@ -1 +1,10 @@
-module.exports = require("@spotify/web-scripts/config/jest.config.js");
+module.exports = {
+  preset: "ts-jest/presets/js-with-ts",
+  globals: {
+    "ts-jest": {
+      tsConfig: {
+        allowJs: true,
+      },
+    },
+  },
+};

package.json

@@ -7,7 +7,7 @@
     "start": "tsc && node dist/app.js",
     "test-hash-performance": "tsc && time head -c 1000000 /dev/random | node dist/bin/hash.js > /dev/null",
     "test-winnow-performance": "tsc && time head -c 1000000 /dev/random | node dist/bin/hash.js > /dev/null",
-    "test": "web-scripts test --coverage",
+    "test": "jest --coverage",
     "build": "tsc",
     "lint": "tslint 'src/**/*.ts'"
   },
@@ -16,8 +16,12 @@
   "license": "MIT",
   "private": false,
   "devDependencies": {
-    "@spotify/web-scripts": "^1.1.0",
+    "@types/jest": "^24.0.15",
     "@types/node": "^12.0.10",
+    "jest": "^24.8.0",
+    "jest-junit": "^6.4.0",
+    "prettier": "^1.18.2",
+    "ts-jest": "^24.0.2",
     "tslint": "^5.18.0",
     "typescript": "^3.5.2"
   },