fix linter

frontend/protractor.conf.js

@@ -22,7 +22,7 @@ exports.config = {
   },
   onPrepare() {
     require('ts-node').register({
-      project: 'e2e/tsconfig.e2e.json',
+      project: 'e2e/tsconfig.json',
     });
     jasmine.getEnv().addReporter(new SpecReporter({spec:
         {displayStacktrace: true},

frontend/tsconfig.spec.json

@@ -0,0 +1,19 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../out-tsc/spec",
+    "baseUrl": "./",
+    "types": [
+      "jasmine",
+      "node"
+    ]
+  },
+  "files": [
+    "src/test.ts",
+    "polyfills.ts"
+  ],
+  "include": [
+    "**/*.spec.ts",
+    "**/*.d.ts"
+  ]
+}