Add generator support for Import (#4945)

packages/babel-generator/src/generators/expressions.js

@@ -113,6 +113,10 @@ export function CallExpression(node: Object) {
   this.token(")");
 }
 
+export function Import() {
+  this.word("import");
+}
+
 function buildYieldAwait(keyword: string) {
   return function (node: Object) {
     this.word(keyword);

packages/babel-generator/test/fixtures/types/Import/actual.js

@@ -0,0 +1 @@
+import("module.js");

packages/babel-generator/test/fixtures/types/Import/expected.js

@@ -0,0 +1 @@
+import("module.js");

packages/babel-types/src/definitions/experimental.js

@@ -35,6 +35,10 @@ defineType("BindExpression", {
   }
 });
 
+defineType("Import", {
+  aliases: ["Expression"]
+});
+
 defineType("Decorator", {
   visitor: ["expression"],
   fields: {