From a50d71a63e2c2c93498b42b8675013fed429ee24 Mon Sep 17 00:00:00 2001
From: Rich-Harris <richard.a.harris@gmail.com>
Date: Sun, 5 Jun 2016 11:00:44 -0400
Subject: [PATCH] preserve debugger statements. closes #664

---
 src/utils/run.js                              |  4 ++++
 test/form/preserve-debugger/_config.js        |  3 +++
 test/form/preserve-debugger/_expected/amd.js  |  7 +++++++
 test/form/preserve-debugger/_expected/cjs.js  |  5 +++++
 test/form/preserve-debugger/_expected/es6.js  |  3 +++
 test/form/preserve-debugger/_expected/iife.js |  8 ++++++++
 test/form/preserve-debugger/_expected/umd.js  | 11 +++++++++++
 test/form/preserve-debugger/main.js           |  3 +++
 8 files changed, 44 insertions(+)
 create mode 100644 test/form/preserve-debugger/_config.js
 create mode 100644 test/form/preserve-debugger/_expected/amd.js
 create mode 100644 test/form/preserve-debugger/_expected/cjs.js
 create mode 100644 test/form/preserve-debugger/_expected/es6.js
 create mode 100644 test/form/preserve-debugger/_expected/iife.js
 create mode 100644 test/form/preserve-debugger/_expected/umd.js
 create mode 100644 test/form/preserve-debugger/main.js

diff --git a/src/utils/run.js b/src/utils/run.js
index b57149d..3e91d63 100644
--- a/src/utils/run.js
+++ b/src/utils/run.js
@@ -75,6 +75,10 @@ export default function run ( node, scope, statement, strongDependencies, force
 				}
 			}
 
+			else if ( node.type === 'DebuggerStatement' ) {
+				hasSideEffect = true;
+			}
+
 			else if ( node.type === 'ThrowStatement' ) {
 				// we only care about errors thrown at the top level, otherwise
 				// any function with error checking gets included if called
diff --git a/test/form/preserve-debugger/_config.js b/test/form/preserve-debugger/_config.js
new file mode 100644
index 0000000..3e65815
--- /dev/null
+++ b/test/form/preserve-debugger/_config.js
@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'debugger statements are preserved (#664)'
+};
diff --git a/test/form/preserve-debugger/_expected/amd.js b/test/form/preserve-debugger/_expected/amd.js
new file mode 100644
index 0000000..be1ef13
--- /dev/null
+++ b/test/form/preserve-debugger/_expected/amd.js
@@ -0,0 +1,7 @@
+define(function () { 'use strict';
+
+	before();
+	debugger;
+	after();
+
+});
diff --git a/test/form/preserve-debugger/_expected/cjs.js b/test/form/preserve-debugger/_expected/cjs.js
new file mode 100644
index 0000000..ae69f57
--- /dev/null
+++ b/test/form/preserve-debugger/_expected/cjs.js
@@ -0,0 +1,5 @@
+'use strict';
+
+before();
+debugger;
+after();
diff --git a/test/form/preserve-debugger/_expected/es6.js b/test/form/preserve-debugger/_expected/es6.js
new file mode 100644
index 0000000..ce1bafd
--- /dev/null
+++ b/test/form/preserve-debugger/_expected/es6.js
@@ -0,0 +1,3 @@
+before();
+debugger;
+after();
diff --git a/test/form/preserve-debugger/_expected/iife.js b/test/form/preserve-debugger/_expected/iife.js
new file mode 100644
index 0000000..b40a100
--- /dev/null
+++ b/test/form/preserve-debugger/_expected/iife.js
@@ -0,0 +1,8 @@
+(function () {
+	'use strict';
+
+	before();
+	debugger;
+	after();
+
+}());
diff --git a/test/form/preserve-debugger/_expected/umd.js b/test/form/preserve-debugger/_expected/umd.js
new file mode 100644
index 0000000..dd19c2d
--- /dev/null
+++ b/test/form/preserve-debugger/_expected/umd.js
@@ -0,0 +1,11 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(factory());
+}(this, function () { 'use strict';
+
+	before();
+	debugger;
+	after();
+
+}));
diff --git a/test/form/preserve-debugger/main.js b/test/form/preserve-debugger/main.js
new file mode 100644
index 0000000..ce1bafd
--- /dev/null
+++ b/test/form/preserve-debugger/main.js
@@ -0,0 +1,3 @@
+before();
+debugger;
+after();