From 0918ffdd3bcf3464fc445a21cf49a8879c540438 Mon Sep 17 00:00:00 2001
From: Herrington Darkholme <nonamesheep1@gmail.com>
Date: Sun, 23 Oct 2016 15:10:00 +0800
Subject: [PATCH] Fix #10967, allow boolean flag to have explicit value

---
 src/compiler/commandLineParser.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index d6c7dad0e8e4f..c4e079c6a13f6 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -599,7 +599,13 @@ namespace ts {
                                     i++;
                                     break;
                                 case "boolean":
-                                    options[opt.name] = true;
+                                    // boolean flag has optional value true, false, others
+                                    let optValue = args[i];
+                                    options[opt.name] = optValue !== "false";
+                                    // consume next argument as boolean flag value
+                                    if (optValue === "false" || optValue === "true") {
+                                        i++;
+                                    }
                                     break;
                                 case "string":
                                     options[opt.name] = args[i] || "";