Add type-checking test

This makes sure that files generated by the blueprints type-check correctly. As all tests use fixture files to test that the blueprints generate the correct output, we can just add a linting test that type-checks the existing static fixtures files, instead of running the blueprints and type-checking the output afterwards.

To make imports not cause type errors, the appropriate typing packages have been added to `devDependencies`, and `types/index.d.ts` declares all in-app modules used in the test fixtures.

.travis.yml

@@ -15,6 +15,7 @@ cache: yarn
 
 script:
   - yarn lint:js
+  - yarn lint:blueprints
   - yarn test
 
 # We build PRs, but don't trigger separate builds for the PR from the branch.

package.json

@@ -15,6 +15,7 @@
   "scripts": {
     "build": "ember build",
     "lint:js": "eslint .",
+    "lint:blueprints": "tsc -noEmit",
     "start": "ember serve",
     "test": "mocha --recursive node-tests"
   },
@@ -37,6 +38,15 @@
   },
   "devDependencies": {
     "@typed-ember/renovate-config": "1.2.1",
+    "@types/chai": "^4.1.7",
+    "@types/ember": "^3.0.29",
+    "@types/ember-mocha": "^0.14.6",
+    "@types/ember-qunit": "^3.4.6",
+    "@types/ember-test-helpers": "^1.0.5",
+    "@types/ember-testing-helpers": "^0.0.3",
+    "@types/ember__test-helpers": "^0.7.8",
+    "@types/mocha": "^5.2.6",
+    "@types/qunit": "^2.5.4",
     "broccoli-asset-rev": "3.0.0",
     "ember-ajax": "5.0.0",
     "ember-cli": "github:ember-cli/ember-cli#f724919b2d0455899411908531c9179240f5ef41",
@@ -63,7 +73,8 @@
     "loader.js": "4.7.0",
     "mocha": "6.0.2",
     "qunit-dom": "0.8.4",
-    "testdouble": "3.11.0"
+    "testdouble": "3.11.0",
+    "typescript": "^3.3.3333"
   },
   "engines": {
     "node": "6.* || 8.* || >= 10.*"

tsconfig.json

@@ -0,0 +1,33 @@
+{
+  "compilerOptions": {
+    "target": "es2017",
+    "allowJs": true,
+    "moduleResolution": "node",
+    "allowSyntheticDefaultImports": true,
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "alwaysStrict": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noEmitOnError": false,
+    "noEmit": true,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "baseUrl": ".",
+    "module": "es6",
+    "skipLibCheck": true,
+    "paths": {
+      "*": [
+        "types/*"
+      ]
+    }
+  },
+  "include": [
+    "node-tests/fixtures/**/*",
+    "types/**/*"
+  ]
+}

types/index.d.ts

@@ -0,0 +1,16 @@
+declare module "dummy/utils/foo-bar";
+declare module "dummy/utils/foo/bar-baz";
+declare module "dummy/initializers/foo";
+declare module "dummy/instance-initializers/foo";
+declare module "my-addon/helpers/foo/bar-baz";
+declare module "my-addon/mixins/foo";
+declare module "my-app/helpers/foo/bar-baz";
+declare module "my-app/initializers/foo";
+declare module "my-app/init/initializers/foo";
+declare module "my-app/instance-initializers/foo";
+declare module "my-app/init/instance-initializers/foo";
+declare module "my-app/mixins/foo";
+declare module "my-app/tests/helpers/module-for-acceptance";
+declare module "my-app/tests/helpers/start-app";
+declare module "my-app/utils/foo-bar";
+declare module "my-app/utils/foo/bar-baz";