feat(typescript): support definite assignment (`!:`) (#4020)

package.json

@@ -35,6 +35,7 @@
     "globby": "6.1.0",
     "graphql": "0.12.3",
     "gray-matter": "3.1.1",
+    "html-tag-names": "1.1.1",
     "ignore": "3.3.7",
     "jest-docblock": "22.2.2",
     "json-stable-stringify": "1.0.1",
@@ -54,9 +55,8 @@
     "resolve": "1.5.0",
     "semver": "5.4.1",
     "string-width": "2.1.1",
-    "html-tag-names": "1.1.1",
     "typescript": "2.7.0-insiders.20171214",
-    "typescript-eslint-parser": "13.0.0",
+    "typescript-eslint-parser": "14.0.0",
     "unicode-regex": "1.0.1",
     "unified": "6.1.6"
   },

src/language-js/printer-estree.js

@@ -3214,7 +3214,7 @@ function printTypeAnnotation(path, options, print) {
   }
 
   return concat([
-    isFunctionDeclarationIdentifier ? "" : ": ",
+    isFunctionDeclarationIdentifier ? "" : node.definite ? "!: " : ": ",
     path.call(print, "typeAnnotation")
   ]);
 }

tests/typescript_definite/__snapshots__/jsfmt.spec.js.snap

@@ -0,0 +1,12 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`definite.ts 1`] = `
+class MyComponent {
+ngModel!: ng.INgModelController;
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+class MyComponent {
+  ngModel!: ng.INgModelController;
+}
+
+`;

tests/typescript_definite/definite.ts

@@ -0,0 +1,3 @@
+class MyComponent {
+ngModel!: ng.INgModelController;
+}

tests/typescript_definite/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname, ["typescript"]);

yarn.lock

@@ -4579,9 +4579,9 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript-eslint-parser@13.0.0:
-  version "13.0.0"
-  resolved "https://registry.yarnpkg.com/typescript-eslint-parser/-/typescript-eslint-parser-13.0.0.tgz#57f9be603d0fad7c26da76c2be67c0779d23362c"
+typescript-eslint-parser@14.0.0:
+  version "14.0.0"
+  resolved "https://registry.yarnpkg.com/typescript-eslint-parser/-/typescript-eslint-parser-14.0.0.tgz#c90a8f541c1d96e5c55e2807c61d154e788520f9"
   dependencies:
     lodash.unescape "4.0.1"
     semver "5.5.0"