Fix missing inner comments in function expressions (#13825)

packages/babel-generator/src/generators/methods.ts

@@ -84,6 +84,7 @@ export function _functionHead(this: Printer, node: any) {
   }
   this.word("function");
   if (node.generator) this.token("*");
+  this.printInnerComments(node);
 
   this.space();
   if (node.id) {

packages/babel-generator/test/fixtures/comments/function-inner-comment/input.js

@@ -0,0 +1,7 @@
+const f = function /*foo*/ () {};
+const g = async function /*foo*/ () {};
+const h = async /*foo*/ function () {};
+const i = function* /*foo*/ () {};
+const j = function/*foo*/* () {};
+const k = async function* /*foo*/ () {};
+const l = function (/*foo*/) {};

packages/babel-generator/test/fixtures/comments/function-inner-comment/options.json

@@ -0,0 +1,3 @@
+{
+  "retainLines": true
+}

packages/babel-generator/test/fixtures/comments/function-inner-comment/output.js

@@ -0,0 +1,7 @@
+const f = function /*foo*/ () {};
+const g = async function /*foo*/ () {};
+const h = async function /*foo*/ () {};
+const i = function* /*foo*/ () {};
+const j = function* /*foo*/ () {};
+const k = async function* /*foo*/ () {};
+const l = function /*foo*/ () {};