From dba72f40f20efa53d472119af63132ca4bf8b497 Mon Sep 17 00:00:00 2001
From: fisker <lionkay@gmail.com>
Date: Mon, 2 Nov 2020 13:09:24 +0800
Subject: [PATCH 1/2] JS: Keep comments in `messageAST`

---
 src/language-js/clean.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/language-js/clean.js b/src/language-js/clean.js
index f695551fe78d..d3f388d9ff85 100644
--- a/src/language-js/clean.js
+++ b/src/language-js/clean.js
@@ -3,7 +3,6 @@
 const ignoredProperties = new Set([
   "range",
   "raw",
-  "comments",
   "leadingComments",
   "trailingComments",
   "innerComments",
@@ -21,6 +20,13 @@ function clean(ast, newObj, parent) {
     delete newObj.sourceType;
   }
 
+  if (ast.type === "Line" || ast.type === "CommentLine") {
+    newObj.value = newObj.value.trimEnd();
+  }
+  if ( ast.type === "Block" || ast.type === "CommentBlock") {
+    newObj.value = newObj.value.split("\n").map(line => line.trim()).join("\n");
+  }
+
   if (
     ast.type === "BigIntLiteral" ||
     ast.type === "BigIntLiteralTypeAnnotation"

From e338ff4248512422141c87fe0192ccf30e3323b4 Mon Sep 17 00:00:00 2001
From: fisker <lionkay@gmail.com>
Date: Mon, 2 Nov 2020 14:23:39 +0800
Subject: [PATCH 2/2] Flow and `insertPragma`

---
 src/language-js/clean.js | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/language-js/clean.js b/src/language-js/clean.js
index d3f388d9ff85..8983e93701b0 100644
--- a/src/language-js/clean.js
+++ b/src/language-js/clean.js
@@ -23,8 +23,20 @@ function clean(ast, newObj, parent) {
   if (ast.type === "Line" || ast.type === "CommentLine") {
     newObj.value = newObj.value.trimEnd();
   }
-  if ( ast.type === "Block" || ast.type === "CommentBlock") {
-    newObj.value = newObj.value.split("\n").map(line => line.trim()).join("\n");
+  if (ast.type === "Block" || ast.type === "CommentBlock") {
+    const comment = newObj.value.trim();
+    if (comment === "* @format") {
+      return null;
+      // Flow comment
+    } else if (comment.startsWith("::") || comment === "* @format") {
+      newObj.value = "";
+    } else {
+      const lines = comment
+        .split("\n")
+        .map((line) => line.trim())
+        .filter((line) => line === "* @format");
+      newObj.value = lines.join("\n");
+    }
   }
 
   if (