1 files changed, 43 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/global-strict.js b/tools/eslint/lib/rules/global-strict.js
new file mode 100644
index 0000000000..c16c62db92
--- /dev/null
+++ b/tools/eslint/lib/rules/global-strict.js
@@ -0,0 +1,43 @@
+/**
+ * @fileoverview Rule to flag or require global strict mode.
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var mode = context.options[0];
+
+    if (mode === "always") {
+
+        return {
+            "Program": function(node) {
+                if (node.body.length > 0) {
+                    var statement = node.body[0];
+
+                    if (!(statement.type === "ExpressionStatement" && statement.expression.value === "use strict")) {
+                        context.report(node, "Use the global form of \"use strict\".");
+                    }
+                }
+            }
+        };
+
+    } else { // mode = "never"
+
+        return {
+            "ExpressionStatement": function(node) {
+                var parent = context.getAncestors().pop();
+
+                if (node.expression.value === "use strict" && parent.type === "Program") {
+                    context.report(node, "Use the function form of \"use strict\".");
+                }
+            }
+        };
+
+    }
+
+};