From e5c09b07f26c93160f148396604aa2acbff5f134 Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Tue, 8 Nov 2022 15:25:42 +0800
Subject: [PATCH 1/2] assert comments

---
 packages/babel-generator/src/index.ts | 28 ++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/packages/babel-generator/src/index.ts b/packages/babel-generator/src/index.ts
index 7f8defd37e75..b55588b5d38a 100644
--- a/packages/babel-generator/src/index.ts
+++ b/packages/babel-generator/src/index.ts
@@ -24,9 +24,12 @@ class Generator extends Printer {
     const map = opts.sourceMaps ? new SourceMap(opts, code) : null;
     super(format, map);
 
+    this.opts = opts;
     this.ast = ast;
   }
 
+  opts: GeneratorOptions;
+
   ast: t.Node;
 
   /**
@@ -36,7 +39,30 @@ class Generator extends Printer {
    */
 
   generate() {
-    return super.generate(this.ast);
+    const code = super.generate(this.ast);
+
+    const comments = (this.ast as { comments?: t.Comment[] }).comments;
+    if (comments?.length) {
+      let num = 0;
+      let last;
+      for (const v of comments) {
+        if (!this._printedComments.has(v)) {
+          last = v;
+          num++;
+        }
+      }
+      if (num > 0) {
+        console.error(
+          `[@babel/generator] Error: There are ${num} comments that were not printed normally, please open an issue on babel repo.\nThe last is \`${
+            last.value
+          }\` at ${
+            this.opts.filename || this.opts.sourceFileName || "unknown file"
+          }:${last.loc?.start.line}:${last.loc?.start.column}`,
+        );
+      }
+    }
+
+    return code;
   }
 }
 

From f8873bb229c6b30a214ec3149c15ad92b3c1ab5a Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Tue, 8 Nov 2022 15:41:14 +0800
Subject: [PATCH 2/2] fix

---
 packages/babel-generator/src/index.ts   | 2 +-
 packages/babel-generator/src/printer.ts | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/babel-generator/src/index.ts b/packages/babel-generator/src/index.ts
index b55588b5d38a..a7e91e15ca2f 100644
--- a/packages/babel-generator/src/index.ts
+++ b/packages/babel-generator/src/index.ts
@@ -46,7 +46,7 @@ class Generator extends Printer {
       let num = 0;
       let last;
       for (const v of comments) {
-        if (!this._printedComments.has(v)) {
+        if (!this._printedComments.has(v) && !v.ignore) {
           last = v;
           num++;
         }
diff --git a/packages/babel-generator/src/printer.ts b/packages/babel-generator/src/printer.ts
index 53d3f736e9cb..e3b9e18fd8a3 100644
--- a/packages/babel-generator/src/printer.ts
+++ b/packages/babel-generator/src/printer.ts
@@ -908,10 +908,10 @@ class Printer {
       return true;
     }
 
-    if (!this.format.shouldPrintComment(comment.value)) return false;
-
     this._printedComments.add(comment);
 
+    if (!this.format.shouldPrintComment(comment.value)) return false;
+
     const isBlockComment = comment.type === "CommentBlock";
 
     // Add a newline before and after a block comment, unless explicitly