[FEATURE] Introduce preview types

.eslintignore

@@ -6,3 +6,5 @@ node-tests/fixtures/**/*.js
 dist/
 tmp/
 smoke-tests/
+types/
+type-tests/preview

package.json

@@ -25,7 +25,8 @@
     "dist/ember-testing.js",
     "dist/ember-testing.map",
     "docs/data.json",
-    "lib"
+    "lib",
+    "types"
   ],
   "repository": {
     "type": "git",
@@ -40,7 +41,9 @@
     "lint:docs": "qunit tests/docs/coverage-test.js",
     "lint:eslint": "eslint --report-unused-disable-directives --cache .",
     "lint:eslint:fix": "npm-run-all \"lint:eslint --fix\"",
-    "lint:tsc": "tsc --noEmit",
+    "lint:tsc:stable": "tsc --noEmit",
+    "lint:tsc:preview": "tsc --noEmit --project type-tests/preview",
+    "lint:tsc": "npm-run-all lint:tsc:*",
     "lint:fix": "npm-run-all lint:*:fix",
     "test": "node bin/run-tests.js",
     "test:blueprints:js": "mocha node-tests/blueprints/**/*-test.js",
@@ -80,6 +83,7 @@
   "devDependencies": {
     "@babel/preset-env": "^7.16.11",
     "@glimmer/compiler": "0.84.2",
+    "@glimmer/component": "^1.1.2",
     "@glimmer/destroyable": "0.84.2",
     "@glimmer/env": "^0.1.7",
     "@glimmer/global-context": "0.84.2",
@@ -93,6 +97,7 @@
     "@glimmer/runtime": "0.84.2",
     "@glimmer/validator": "0.84.2",
     "@simple-dom/document": "^1.4.0",
+    "@tsconfig/ember": "^1.0.1",
     "@types/qunit": "^2.19.2",
     "@types/rsvp": "^4.0.4",
     "@typescript-eslint/eslint-plugin": "^5.22.0",
@@ -154,10 +159,20 @@
     "testem-failure-only-reporter": "^1.0.0",
     "typescript": "~4.6.4"
   },
+  "peerDependencies": {
+    "@glimmer/component": "^1.1.2"
+  },
   "engines": {
     "node": ">= 12.*"
   },
   "ember-addon": {
     "after": "ember-cli-legacy-blueprints"
+  },
+  "typesVersions": {
+    "*": {
+      "preview": [
+        "./types/preview"
+      ]
+    }
   }
 }

packages/@ember/-internals/runtime/lib/mixins/registry_proxy.ts

@@ -12,6 +12,14 @@ import { assert } from '@ember/debug';
 // This is defined as a separate interface so that it can be used in the definition of
 // `Owner` without also including the `__registry__` property.
 export interface IRegistry {
+  /**
+   Given a fullName return the corresponding factory.
+
+   @public
+   @method resolveRegistration
+   @param {String} fullName
+   @return {Function} fullName's factory
+   */
   resolveRegistration(fullName: string): Factory<object> | object | undefined;
 
   register(fullName: string, factory: Factory<object> | object, options?: TypeOptions): void;
@@ -48,14 +56,6 @@ interface RegistryProxyMixin extends IRegistry {
 const RegistryProxyMixin = Mixin.create({
   __registry__: null,
 
-  /**
-   Given a fullName return the corresponding factory.
-
-   @public
-   @method resolveRegistration
-   @param {String} fullName
-   @return {Function} fullName's factory
-   */
   resolveRegistration(fullName: string) {
     assert('fullName must be a proper full name', this.__registry__.isValidFullName(fullName));
     return this.__registry__.resolve(fullName);

packages/@ember/array/index.ts

@@ -279,6 +279,10 @@ interface EmberArray<T> extends Enumerable {
   ): NativeArray<T>;
   filterBy(key: string, value?: unknown): NativeArray<T>;
   rejectBy(key: string, value?: unknown): NativeArray<T>;
+  find<S extends T, Target = void>(
+    predicate: (this: void, value: T, index: number, obj: T[]) => value is S,
+    thisArg?: Target
+  ): S | undefined;
   find<Target = void>(
     callback: (this: Target, item: T, index: number, arr: this) => unknown,
     target?: Target
@@ -1907,7 +1911,8 @@ const MutableArray = Mixin.create(EmberArray, MutableEnumerable, {
 */
 interface NativeArray<T>
   extends Omit<Array<T>, 'every' | 'filter' | 'find' | 'forEach' | 'map' | 'reduce' | 'slice'>,
-    MutableArray<T> {}
+    MutableArray<T>,
+    Observable {}
 
 let NativeArray = Mixin.create(MutableArray, Observable, {
   objectAt(idx: number) {

tsconfig.json

@@ -35,5 +35,5 @@
 
   "include": ["packages/**/*.ts"],
 
-  "exclude": ["dist", "node_modules", "tmp"]
+  "exclude": ["dist", "node_modules", "tmp", "types"]
 }

type-tests/preview/@ember/application-test/application-instance.ts

@@ -0,0 +1,45 @@
+import ApplicationInstance from '@ember/application/instance';
+
+declare function hbs(strings: TemplateStringsArray): object;
+
+const appInstance = ApplicationInstance.create();
+appInstance.register('some:injection', class Foo {});
+
+appInstance.register('some:injection', class Foo {}, {
+  singleton: true,
+});
+
+appInstance.register('some:injection', class Foo {}, {
+  instantiate: false,
+});
+
+appInstance.register('templates:foo/bar', hbs`<h1>Hello World</h1>`);
+appInstance.register('templates:foo/bar', hbs`<h1>Hello World</h1>`, {
+  singleton: true,
+});
+appInstance.register('templates:foo/bar', hbs`<h1>Hello World</h1>`, {
+  instantiate: true,
+});
+appInstance.register('templates:foo/bar', hbs`<h1>Hello World</h1>`, {
+  singleton: true,
+  instantiate: true,
+});
+appInstance.register('templates:foo/bar', hbs`<h1>Hello World</h1>`, {
+  // @ts-expect-error
+  singleton: 'true',
+  instantiate: true,
+});
+
+appInstance.register('some:injection', class Foo {}, {
+  singleton: false,
+  instantiate: true,
+});
+
+appInstance.factoryFor('router:main');
+appInstance.lookup('route:basic');
+
+appInstance.boot();
+
+(async () => {
+  await appInstance.boot();
+})();

type-tests/preview/@ember/application-test/application.ts

@@ -0,0 +1,44 @@
+import Application from '@ember/application';
+import ApplicationInstance from '@ember/application/instance';
+import EmberObject from '@ember/object';
+import { expectTypeOf } from 'expect-type';
+
+const BaseApp = Application.extend({
+  modulePrefix: 'my-app',
+});
+
+class Obj extends EmberObject.extend({ foo: 'bar' }) {}
+
+BaseApp.initializer({
+  name: 'my-initializer',
+  initialize(app) {
+    app.register('foo:bar', Obj);
+  },
+});
+
+BaseApp.instanceInitializer({
+  name: 'my-instance-initializer',
+  initialize(app) {
+    (app.lookup('foo:bar') as Obj).get('foo');
+  },
+});
+
+const App1 = BaseApp.create({
+  rootElement: '#app-one',
+  customEvents: {
+    paste: 'paste',
+  },
+});
+
+const App2 = BaseApp.create({
+  rootElement: '#app-two',
+  customEvents: {
+    mouseenter: null,
+    mouseleave: null,
+  },
+});
+
+const App3 = BaseApp.create();
+
+expectTypeOf(App3.buildInstance()).toEqualTypeOf<ApplicationInstance>();
+expectTypeOf(App3.buildInstance({ foo: 'bar' })).toEqualTypeOf<ApplicationInstance>();

type-tests/preview/@ember/application-test/deprecations.ts

@@ -0,0 +1,17 @@
+import { deprecate, deprecateFunc } from '@ember/application/deprecations';
+
+deprecate('this is no longer advised', false, {
+  id: 'no-longer-advised',
+  until: 'v4.0',
+});
+deprecate('this is no longer advised', false, {
+  id: 'no-longer-advised',
+  until: 'v4.0',
+  url: 'https://emberjs.com',
+});
+// @ts-expect-error
+deprecate('this is no longer advised', false);
+
+// @ts-expect-error
+deprecateFunc('this is no longer advised', () => {});
+deprecateFunc('this is no longer advised', { id: 'no-longer-do-this', until: 'v4.0' }, () => {});

type-tests/preview/@ember/application-test/index.ts

@@ -0,0 +1,27 @@
+import { getOwner, setOwner } from '@ember/application';
+import EngineInstance from '@ember/engine/instance';
+import Owner from '@ember/owner';
+import ApplicationInstance from '@ember/application/instance';
+import Service from '@ember/service';
+import { expectTypeOf } from 'expect-type';
+
+expectTypeOf(getOwner({})).toEqualTypeOf<Owner | undefined>();
+
+// Confirm that random subclasses work as expected.
+declare class MyService extends Service {
+  withStuff: true;
+}
+declare let myService: MyService;
+expectTypeOf(getOwner(myService)).toEqualTypeOf<Owner>();
+
+// @ts-expect-error
+getOwner();
+
+declare let baseOwner: Owner;
+expectTypeOf(setOwner({}, baseOwner)).toBeVoid();
+
+declare let engine: EngineInstance;
+expectTypeOf(setOwner({}, engine)).toBeVoid();
+
+declare let application: ApplicationInstance;
+expectTypeOf(setOwner({}, application)).toBeVoid();

type-tests/preview/@ember/array-test/array-proxy.ts

@@ -0,0 +1,60 @@
+import ArrayProxy from '@ember/array/proxy';
+import EmberArray, { A } from '@ember/array';
+import EmberObject from '@ember/object';
+import { expectTypeOf } from 'expect-type';
+
+const pets = ['dog', 'cat', 'fish'];
+const proxy = ArrayProxy.create({ content: A(pets) });
+
+proxy.get('firstObject'); // 'dog'
+proxy.set('content', A(['amoeba', 'paramecium']));
+proxy.get('firstObject'); // 'amoeba'
+
+const overridden = ArrayProxy.create({
+  content: A(pets),
+  objectAtContent(this: ArrayProxy<string>, idx: number): string | undefined {
+    // NOTE: cast is necessary because `this` is not managed correctly in the
+    // `.create()` body anymore.
+    return (this.get('content') as EmberArray<string>).objectAt(idx)?.toUpperCase();
+  },
+});
+
+overridden.get('firstObject'); // 'DOG'
+
+class MyNewProxy<T> extends ArrayProxy<T> {
+  isNew = true;
+}
+
+const x = MyNewProxy.create({ content: A([1, 2, 3]) }) as MyNewProxy<number>;
+expectTypeOf(x.get('firstObject')).toEqualTypeOf<number | undefined>();
+expectTypeOf(x.isNew).toBeBoolean();
+
+// Custom EmberArray
+interface MyArray<T> extends EmberObject, EmberArray<T> {}
+class MyArray<T> extends EmberObject.extend(EmberArray) {
+  constructor(content: ArrayLike<T>) {
+    super();
+    this._content = content;
+  }
+
+  _content: ArrayLike<T>;
+
+  get length() {
+    return this._content.length;
+  }
+
+  objectAt(idx: number) {
+    return this._content[idx];
+  }
+}
+
+const customArrayProxy = ArrayProxy.create({ content: new MyArray(pets) });
+customArrayProxy.get('firstObject'); // 'dog'
+
+// Vanilla array
+const vanillaArrayProxy = ArrayProxy.create({ content: pets });
+vanillaArrayProxy.get('firstObject'); // 'dog'
+
+// Nested ArrayProxy
+const nestedArrayProxy = ArrayProxy.create({ content: proxy });
+nestedArrayProxy.get('firstObject'); // 'amoeba'

type-tests/preview/@ember/array-test/array.ts

@@ -0,0 +1,73 @@
+import EmberObject from '@ember/object';
+import type Array from '@ember/array';
+import { A } from '@ember/array';
+import type MutableArray from '@ember/array/mutable';
+import { expectTypeOf } from 'expect-type';
+
+class Person extends EmberObject {
+  name = '';
+  isHappy = false;
+}
+
+const people = A([
+  Person.create({ name: 'Yehuda', isHappy: true }),
+  Person.create({ name: 'Majd', isHappy: false }),
+]);
+
+expectTypeOf(people.get('length')).toBeNumber();
+expectTypeOf(people.get('lastObject')).toEqualTypeOf<Person | undefined>();
+expectTypeOf(people.get('firstObject')).toEqualTypeOf<Person | undefined>();
+expectTypeOf(people.isAny('isHappy')).toBeBoolean();
+expectTypeOf(people.isAny('isHappy', false)).toBeBoolean();
+// @ts-expect-error -- string != boolean
+people.isAny('isHappy', 'false');
+
+expectTypeOf(people.objectAt(0)).toEqualTypeOf<Person | undefined>();
+expectTypeOf(people.objectsAt([1, 2, 3])).toEqualTypeOf<Array<Person | undefined>>();
+
+expectTypeOf(people.filterBy('isHappy')).toMatchTypeOf<Person[]>();
+expectTypeOf(people.filterBy('isHappy')).toMatchTypeOf<MutableArray<Person>>();
+expectTypeOf(people.rejectBy('isHappy')).toMatchTypeOf<Person[]>();
+expectTypeOf(people.rejectBy('isHappy')).toMatchTypeOf<MutableArray<Person>>();
+expectTypeOf(people.filter((person) => person.get('name') === 'Yehuda')).toMatchTypeOf<Person[]>();
+expectTypeOf(people.filter((person) => person.get('name') === 'Yehuda')).toMatchTypeOf<
+  MutableArray<Person>
+>();
+
+expectTypeOf(people.get('[]')).toEqualTypeOf<typeof people>();
+expectTypeOf(people.get('[]').get('firstObject')).toEqualTypeOf<Person | undefined>();
+
+expectTypeOf(people.mapBy('isHappy')).toMatchTypeOf<boolean[]>();
+expectTypeOf(people.mapBy('name.length')).toMatchTypeOf<unknown[]>();
+
+const last = people.get('lastObject');
+expectTypeOf(last).toEqualTypeOf<Person | undefined>();
+if (last) {
+  expectTypeOf(last.get('name')).toBeString();
+}
+
+const first = people.get('lastObject');
+if (first) {
+  expectTypeOf(first.get('isHappy')).toBeBoolean();
+}
+
+const letters = A(['a', 'b', 'c']);
+const codes = letters.map((item, index, array) => {
+  expectTypeOf(item).toBeString();
+  expectTypeOf(index).toBeNumber();
+  expectTypeOf(array).toMatchTypeOf<string[]>();
+  return item.charCodeAt(0);
+});
+expectTypeOf(codes).toMatchTypeOf<number[]>();
+
+const value = '1,2,3';
+const filters = A(value.split(','));
+filters.push('4');
+filters.sort();
+
+const multiSortArr = A([
+  { k: 'a', v: 'z' },
+  { k: 'a', v: 'y' },
+  { k: 'b', v: 'c' },
+]);
+multiSortArr.sortBy('k', 'v');