From a76e58e5fde350026ab1bb15356ca1f51ad74bba Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 27 Nov 2020 18:13:04 -0500
Subject: [PATCH] build: avoid shipping patch flag name strings in prod

---
 packages/compiler-core/src/transforms/transformText.ts |  3 ++-
 packages/compiler-core/src/transforms/vFor.ts          | 10 ++++++----
 packages/compiler-core/src/transforms/vIf.ts           |  7 ++++---
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/packages/compiler-core/src/transforms/transformText.ts b/packages/compiler-core/src/transforms/transformText.ts
index 103ceb6fb..0c672f9cc 100644
--- a/packages/compiler-core/src/transforms/transformText.ts
+++ b/packages/compiler-core/src/transforms/transformText.ts
@@ -85,7 +85,8 @@ export const transformText: NodeTransform = (node, context) => {
             getConstantType(child) === ConstantTypes.NOT_CONSTANT
           ) {
             callArgs.push(
-              `${PatchFlags.TEXT} /* ${PatchFlagNames[PatchFlags.TEXT]} */`
+              PatchFlags.TEXT +
+                (__DEV__ ? ` /* ${PatchFlagNames[PatchFlags.TEXT]} */` : ``)
             )
           }
           children[i] = {
diff --git a/packages/compiler-core/src/transforms/vFor.ts b/packages/compiler-core/src/transforms/vFor.ts
index 7949c014f..aadb07eda 100644
--- a/packages/compiler-core/src/transforms/vFor.ts
+++ b/packages/compiler-core/src/transforms/vFor.ts
@@ -88,7 +88,8 @@ export const transformFor = createStructuralDirectiveTransform(
         helper(FRAGMENT),
         undefined,
         renderExp,
-        `${fragmentFlag} /* ${PatchFlagNames[fragmentFlag]} */`,
+        fragmentFlag +
+          (__DEV__ ? ` /* ${PatchFlagNames[fragmentFlag]} */` : ``),
         undefined,
         undefined,
         true /* isBlock */,
@@ -147,9 +148,10 @@ export const transformFor = createStructuralDirectiveTransform(
             helper(FRAGMENT),
             keyProperty ? createObjectExpression([keyProperty]) : undefined,
             node.children,
-            `${PatchFlags.STABLE_FRAGMENT} /* ${
-              PatchFlagNames[PatchFlags.STABLE_FRAGMENT]
-            } */`,
+            PatchFlags.STABLE_FRAGMENT +
+              (__DEV__
+                ? ` /* ${PatchFlagNames[PatchFlags.STABLE_FRAGMENT]} */`
+                : ``),
             undefined,
             undefined,
             true
diff --git a/packages/compiler-core/src/transforms/vIf.ts b/packages/compiler-core/src/transforms/vIf.ts
index e98604d03..a9ea7acfb 100644
--- a/packages/compiler-core/src/transforms/vIf.ts
+++ b/packages/compiler-core/src/transforms/vIf.ts
@@ -251,9 +251,10 @@ function createChildrenCodegenNode(
         helper(FRAGMENT),
         createObjectExpression([keyProperty]),
         children,
-        `${PatchFlags.STABLE_FRAGMENT} /* ${
-          PatchFlagNames[PatchFlags.STABLE_FRAGMENT]
-        } */`,
+        PatchFlags.STABLE_FRAGMENT +
+          (__DEV__
+            ? ` /* ${PatchFlagNames[PatchFlags.STABLE_FRAGMENT]} */`
+            : ``),
         undefined,
         undefined,
         true,