From d661e15ce2296b7a7d4ceb3ca6ba2c73aa64be77 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Wed, 15 Jul 2015 20:23:24 +0100
Subject: [PATCH] force push newline for line comments when in compact mode -
 fixes #2006

---
 packages/babel/src/generation/index.js                         | 2 +-
 packages/babel/test/fixtures/generation/compact/options.json   | 3 +++
 .../fixtures/generation/compact/single-line-comment/actual.js  | 2 ++
 .../generation/compact/single-line-comment/expected.js         | 2 ++
 4 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 packages/babel/test/fixtures/generation/compact/options.json
 create mode 100644 packages/babel/test/fixtures/generation/compact/single-line-comment/actual.js
 create mode 100644 packages/babel/test/fixtures/generation/compact/single-line-comment/expected.js

diff --git a/packages/babel/src/generation/index.js b/packages/babel/src/generation/index.js
index 6790be88c6..68a6703852 100644
--- a/packages/babel/src/generation/index.js
+++ b/packages/babel/src/generation/index.js
@@ -456,7 +456,7 @@ class CodeGenerator {
 
       // force a newline for line comments when retainLines is set in case the next printed node
       // doesn't catch up
-      if (this.format.retainLines && comment.type === "CommentLine") {
+      if ((this.format.compact || this.format.retainLines) && comment.type === "CommentLine") {
         val += "\n";
       }
 
diff --git a/packages/babel/test/fixtures/generation/compact/options.json b/packages/babel/test/fixtures/generation/compact/options.json
new file mode 100644
index 0000000000..eb4e948bfa
--- /dev/null
+++ b/packages/babel/test/fixtures/generation/compact/options.json
@@ -0,0 +1,3 @@
+{
+  "compact": true
+}
diff --git a/packages/babel/test/fixtures/generation/compact/single-line-comment/actual.js b/packages/babel/test/fixtures/generation/compact/single-line-comment/actual.js
new file mode 100644
index 0000000000..e2589c7138
--- /dev/null
+++ b/packages/babel/test/fixtures/generation/compact/single-line-comment/actual.js
@@ -0,0 +1,2 @@
+// foo
+bar();
diff --git a/packages/babel/test/fixtures/generation/compact/single-line-comment/expected.js b/packages/babel/test/fixtures/generation/compact/single-line-comment/expected.js
new file mode 100644
index 0000000000..e2589c7138
--- /dev/null
+++ b/packages/babel/test/fixtures/generation/compact/single-line-comment/expected.js
@@ -0,0 +1,2 @@
+// foo
+bar();