Handle definite variable declarations (#4025)

* Handle definite variable declarations

* printDefinite -> isDefinite

src/language-js/printer-estree.js

@@ -3204,6 +3204,12 @@ function printTypeAnnotation(path, options, print) {
   }
 
   const parentNode = path.getParentNode();
+  const isDefinite =
+    node.definite ||
+    (parentNode &&
+      parentNode.type === "VariableDeclarator" &&
+      parentNode.definite);
+
   const isFunctionDeclarationIdentifier =
     parentNode.type === "DeclareFunction" && parentNode.id === node;
 
@@ -3214,7 +3220,7 @@ function printTypeAnnotation(path, options, print) {
   }
 
   return concat([
-    isFunctionDeclarationIdentifier ? "" : node.definite ? "!: " : ": ",
+    isFunctionDeclarationIdentifier ? "" : isDefinite ? "!: " : ": ",
     path.call(print, "typeAnnotation")
   ]);
 }

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

@@ -4,9 +4,17 @@ exports[`definite.ts 1`] = `
 class MyComponent {
 ngModel!: ng.INgModelController;
 }
+
+const x!: string
+
+var y!: MyComponent
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 class MyComponent {
   ngModel!: ng.INgModelController;
 }
 
+const x!: string;
+
+var y!: MyComponent;
+
 `;

tests/typescript_definite/definite.ts

@@ -1,3 +1,7 @@
 class MyComponent {
 ngModel!: ng.INgModelController;
 }
+
+const x!: string
+
+var y!: MyComponent