chore(deps): install and configure TypeScript

.eslintignore

@@ -4,3 +4,6 @@ node_modules/
 # Output
 dist/
 tmp/
+
+# TypeScript Declarations
+types/

.eslintrc.js

@@ -27,6 +27,18 @@ module.exports = {
     'no-console': 'off'
   },
   overrides: [
+    // TypeScript files
+    {
+      parser: 'typescript-eslint-parser',
+      files: [
+        'addon/**/*.ts',
+        'tests/**/*.ts'
+      ],
+      rules: {
+        'no-undef': 'off',
+        'no-unused-vars': 'off'
+      }
+    },
     // tests
     {
       env: {

package.json

@@ -16,10 +16,12 @@
   },
   "scripts": {
     "build": "ember build",
-    "lint:js": "eslint --ext js .",
+    "lint:js": "eslint --ext js --ext ts .",
     "start": "ember server",
     "test": "ember test",
-    "test:all": "ember try:each"
+    "test:all": "ember try:each",
+    "prepublishOnly": "ember ts:precompile",
+    "postpublish": "ember ts:clean"
   },
   "husky": {
     "hooks": {
@@ -28,7 +30,7 @@
     }
   },
   "lint-staged": {
-    "*.js": [
+    "*.{js,ts}": [
       "eslint --fix",
       "git add"
     ]
@@ -41,6 +43,13 @@
     "@commitlint/cli": "^7.0.0",
     "@commitlint/config-conventional": "^7.0.1",
     "@commitlint/travis-cli": "^7.0.0",
+    "@types/ember": "^2.8.28",
+    "@types/ember-data": "^2.14.17",
+    "@types/ember-mocha": "^0.12.3",
+    "@types/ember-test-helpers": "^0.7.1",
+    "@types/ember-testing-helpers": "^0.0.3",
+    "@types/mocha": "^5.2.3",
+    "@types/rsvp": "^4.0.2",
     "broccoli-asset-rev": "^2.7.0",
     "chai": "^4.1.2",
     "debug": "^3.1.0",
@@ -58,6 +67,7 @@
     "ember-cli-sri": "^2.1.0",
     "ember-cli-test-loader": "^2.1.0",
     "ember-cli-testdouble": "^0.1.3",
+    "ember-cli-typescript": "^1.3.2",
     "ember-cli-uglify": "^2.1.0",
     "ember-data": "^3.1.1",
     "ember-export-application-global": "2.0.0",
@@ -80,7 +90,14 @@
     "loader.js": "^4.7.0",
     "prettier": "^1.13.5",
     "testdouble": "^3.8.1",
-    "testdouble-chai": "^0.5.0"
+    "testdouble-chai": "^0.5.0",
+    "typescript": "^2.9.2",
+    "typescript-eslint-parser": "^16.0.1"
+  },
+  "resolutions": {
+    "@types/ember": "2.8.28",
+    "@types/mocha": "5.2.3",
+    "@types/rsvp": "4.0.2"
   },
   "engines": {
     "node": "^4.5 || 6.* || >= 7.*"

tests/dummy/app/config/environment.d.ts

@@ -0,0 +1,16 @@
+export default config;
+
+/**
+ * Type declarations for
+ *    import config from './config/environment'
+ *
+ * For now these need to be managed by the developer
+ * since different ember addons can materialize new entries.
+ */
+declare const config: {
+  environment: any;
+  modulePrefix: string;
+  podModulePrefix: string;
+  locationType: string;
+  rootURL: string;
+};

tsconfig.json

@@ -0,0 +1,47 @@
+{
+  "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",
+    "paths": {
+      "dummy/tests/*": [
+        "tests/*"
+      ],
+      "dummy/*": [
+        "tests/dummy/app/*",
+        "app/*"
+      ],
+      "ember-ajax": [
+        "addon"
+      ],
+      "ember-ajax/*": [
+        "addon/*"
+      ],
+      "*": [
+        "types/*"
+      ]
+    }
+  },
+  "include": [
+    "app",
+    "addon",
+    "tests",
+    "types"
+  ]
+}

types/dummy/index.d.ts

@@ -0,0 +1 @@
+

types/ember-data.d.ts

@@ -0,0 +1,8 @@
+/**
+ * Catch-all for ember-data.
+ */
+declare module 'ember-data' {
+  interface ModelRegistry {
+    [key: string]: any;
+  }
+}