feat: add TypeScript and its configuration to test-app

test-app/config/environment.d.ts

@@ -0,0 +1,13 @@
+export default config;
+
+/**
+ * Type declarations for import config from 'my-app/config/environment'
+ */
+declare const config: {
+  environment: string;
+  modulePrefix: string;
+  podModulePrefix: string;
+  locationType: 'auto' | 'hash' | 'history' | 'none';
+  rootURL: string;
+  APP: Record<string, unknown>;
+};

test-app/package.json

@@ -31,6 +31,8 @@
     "@embroider/test-setup": "3.0.1",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
+    "@tsconfig/ember": "^3.0.1",
+    "@types/qunit": "^2.19.6",
     "@typescript-eslint/eslint-plugin": "^6.5.0",
     "@typescript-eslint/parser": "^6.5.0",
     "broccoli-asset-rev": "3.0.0",
@@ -44,6 +46,7 @@
     "ember-cli-inject-live-reload": "2.1.0",
     "ember-cli-sri": "2.1.1",
     "ember-cli-terser": "4.0.2",
+    "ember-cli-typescript": "^5.2.1",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-fetch": "8.1.2",
     "ember-load-initializers": "2.1.2",
@@ -69,6 +72,7 @@
     "qunit": "2.19.4",
     "qunit-dom": "2.0.0",
     "release-it": "15.11.0",
+    "typescript": "^5.2.2",
     "webpack": "5.88.2"
   },
   "engines": {

test-app/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "extends": "@tsconfig/ember/tsconfig.json",
+  "compilerOptions": {
+    // The combination of `baseUrl` with `paths` allows Ember's classic package
+    // layout, which is not resolvable with the Node resolution algorithm, to
+    // work with TypeScript.
+    "baseUrl": ".",
+    // Type check only the code specifically refered to in the source code.
+    "skipLibCheck": true,
+    "paths": {
+      "test-app/tests/*": ["tests/*"],
+      "test-app/*": ["app/*"],
+      "*": ["types/*"]
+    }
+  },
+  "include": ["app/**/*", "tests/**/*", "types/**/*"]
+}

test-app/types/index.d.ts

@@ -0,0 +1,2 @@
+import 'ember-source/types';
+import 'ember-source/types/preview';