[WIP EXPERIMENT] attempt to use babel preset-typescript instead of ts-jest

frontend/lib/routes.ts

@@ -91,13 +91,15 @@ function createOnboardingRouteInfo(prefix: string) {
  * This namespace parallels our Routes object, providing useful types
  * related to specific routes.
  */
+/*
 export namespace RouteTypes {
   export namespace onboarding {
     export namespace forIntent {
       export type RouteProps = RouteComponentProps<{ intent: string }>;
     }
   }
 }
+*/
 
 /**
  * This is an ad-hoc structure that defines URL routes for our app.

jest.config.js

@@ -3,12 +3,14 @@ const path = require('path');
 module.exports = {
   "testURL": "http://localhost",
   "transform": {
-    "^.+\\.tsx?$": "ts-jest"
+    "^.+\\.tsx?$": "./jest.transform.js"
   },
   "roots": [
     "frontend"
   ],
-  "collectCoverage": true,
+  // We need to disable coverage to avoid the following issue:
+  // https://github.com/istanbuljs/istanbuljs/issues/237
+  "collectCoverage": false,
   "coveragePathIgnorePatterns": [
     "/node_modules/",
     "safe-mode-globals.d.ts",

jest.transform.js

@@ -0,0 +1,17 @@
+module.exports = require('babel-jest').createTransformer({
+  presets: [
+    ['@babel/preset-env', {
+      targets: {
+        "node": "current"
+      }
+    }],
+    '@babel/preset-typescript',
+    '@babel/preset-react',
+  ],
+  plugins: [
+    ["@babel/plugin-proposal-decorators", { "legacy": true }],
+    '@babel/plugin-proposal-class-properties',
+    "@babel/plugin-syntax-dynamic-import",
+    "babel-plugin-dynamic-import-node-babel-7",
+  ]
+});