test: update for TS 3.7/Babel 7.7.0

* remove property initialization order test
* upgrade prettier (so it understands class field declarations)
* add test for class field declarations
* enable optional chaining and nullish coalescing test (bonus)

Author: jamescdavis

package.json

@@ -118,7 +118,7 @@
     "in-repo-b": "link:tests/dummy/lib/in-repo-b",
     "loader.js": "4.7.0",
     "mocha": "6.2.2",
-    "prettier": "1.18.2",
+    "prettier": "1.19.1",
     "qunit-dom": "0.9.2",
     "testdouble": "3.12.4",
     "tmp": "0.1.0",

tests/unit/build-test.ts

@@ -28,24 +28,19 @@ module('Unit | Build', function() {
     assert.equal(fromTs, 'From test-support');
   });
 
-  test('property initialization occurs in the right order', function(assert) {
-    class TestClass {
-      // we shouldn't encourage folks to write code like this, but tsc ensures
-      // that constructor param fields are set before field initializers run
-      field = this.constructorParam;
-      constructor(private constructorParam: string) {}
+  test('optional chaining and nullish coalescing are transpiled correctly', function(assert) {
+    let value = { a: 'hello' } as { a?: string; b?: string };
+    assert.equal(value?.a, 'hello');
+    assert.equal(value?.b, undefined);
+    assert.equal(value?.a ?? 'ok', 'hello');
+    assert.equal(value?.b ?? 'ok', 'ok');
+  });
+
+  test('class field declarations work', function(assert) {
+    class MyClass {
+      declare foo: string;
     }
 
-    let instance = new TestClass('hello');
-    assert.equal(instance.field, 'hello');
+    assert.notOk('foo' in new MyClass());
   });
-
-  // TODO: enable once a release of Prettier comes out that supports this syntax
-  // test('optional chaining and nullish coalescing are transpiled correctly', function(assert) {
-  //   let value = { a: 'hello' } as { a?: string; b?: string };
-  //   assert.equal(value?.a, 'hello');
-  //   assert.equal(value?.b, undefined);
-  //   assert.equal(value?.a ?? 'ok', 'hello');
-  //   assert.equal(value?.b ?? 'ok', 'ok');
-  // });
 });

yarn.lock

@@ -13358,10 +13358,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@1.18.2:
-  version "1.18.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
-  integrity sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==
+prettier@1.19.1:
+  version "1.19.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
+  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
 
 pretty-hrtime@^1.0.3:
   version "1.0.3"