add TSConstructorType (#1367)

* add TSConstructorType

* combine condition

* combine strings

src/printer.js

@@ -1515,8 +1515,10 @@ function genericPrintNoParens(path, options, print, args) {
             path.getParentNode().constraint) &&
           // TypeScript should not have a colon in TSFirstTypeNode nodes
           // `a is number`
+          // or TSConstructorType nodes
           !(path.getParentNode().type === "TypeAnnotation" &&
-           path.getParentNode().typeAnnotation.type === 'TSFirstTypeNode')
+            (path.getParentNode().typeAnnotation.type === 'TSFirstTypeNode' ||
+              path.getParentNode().typeAnnotation.type === "TSConstructorType"))
         ) {
           parts.push(": ");
         }
@@ -1972,6 +1974,13 @@ function genericPrintNoParens(path, options, print, args) {
         path.call(print, "indexType"),
         "]"
       ])
+    case "TSConstructorType":
+      return concat([
+        "new(",
+        join(", ", path.map(print, "parameters")),
+        ") => ",
+        path.call(print, "typeAnnotation"),
+      ])
     // TODO
     case "ClassHeritage":
     // TODO

tests/typescript/conformance/types/constructorType/__snapshots__/jsfmt.spec.js.snap

@@ -0,0 +1,8 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`cunstructorType.ts 1`] = `
+var d: new(x: number) => void;
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+var d: new(x: number) => void;
+
+`;

tests/typescript/conformance/types/constructorType/cunstructorType.ts

@@ -0,0 +1 @@
+var d: new(x: number) => void;

tests/typescript/conformance/types/constructorType/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname, { parser: "typescript" });