Add support for migrating to TypeScript

package.json

@@ -21,18 +21,26 @@
     "lint:js": "eslint .",
     "start": "ember serve",
     "test": "ember test",
-    "test:all": "ember try:each"
+    "test:all": "ember try:each",
+    "prepublishOnly": "ember ts:precompile",
+    "postpublish": "ember ts:clean"
   },
   "dependencies": {
     "axe-core": "^4.0.1",
     "broccoli-funnel": "^3.0.3",
     "ember-cli-babel": "^7.22.1",
+    "ember-cli-typescript": "^3.1.4",
     "ember-cli-version-checker": "^5.1.1",
     "ember-get-config": "^0.2.4"
   },
   "devDependencies": {
     "@ember/jquery": "^1.1.0",
     "@ember/optional-features": "^1.3.0",
+    "@types/ember": "^3.16.0",
+    "@types/ember-qunit": "^3.4.9",
+    "@types/ember__test-helpers": "^1.7.2",
+    "@types/qunit": "^2.9.1",
+    "@types/rsvp": "^4.0.3",
     "broccoli-asset-rev": "^3.0.0",
     "ember-ajax": "^5.0.0",
     "ember-cli": "^3.20.0",
@@ -45,6 +53,7 @@
     "ember-cli-release": "^0.2.9",
     "ember-cli-sass": "^10.0.1",
     "ember-cli-sri": "^2.1.1",
+    "ember-cli-typescript-blueprints": "^3.0.0",
     "ember-cli-uglify": "^3.0.0",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.1",
@@ -63,7 +72,8 @@
     "qunit-dom": "^1.4.0",
     "release-it": "^13.6.5",
     "release-it-lerna-changelog": "^2.3.0",
-    "sass": "^1.26.10"
+    "sass": "^1.26.10",
+    "typescript": "^4.0.2"
   },
   "engines": {
     "node": "10.* || >= 12"

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 +1,56 @@
+{
+  "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",
+    "experimentalDecorators": true,
+    "paths": {
+      "dummy/tests/*": [
+        "tests/*"
+      ],
+      "dummy/*": [
+        "tests/dummy/app/*",
+        "app/*"
+      ],
+      "ember-a11y-testing": [
+        "addon"
+      ],
+      "ember-a11y-testing/*": [
+        "addon/*"
+      ],
+      "ember-a11y-testing/test-support": [
+        "addon-test-support"
+      ],
+      "ember-a11y-testing/test-support/*": [
+        "addon-test-support/*"
+      ],
+      "*": [
+        "types/*"
+      ]
+    }
+  },
+  "include": [
+    "app/**/*",
+    "addon/**/*",
+    "tests/**/*",
+    "types/**/*",
+    "test-support/**/*",
+    "addon-test-support/**/*"
+  ]
+}

types/dummy/index.d.ts

@@ -0,0 +1 @@
+

types/global.d.ts

@@ -0,0 +1,6 @@
+// Types for compiled templates
+declare module 'ember-a11y-testing/templates/*' {
+  import { TemplateFactory } from 'htmlbars-inline-precompile';
+  const tmpl: TemplateFactory;
+  export default tmpl;
+}