build: avoid shipping patch flag name strings in prod

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] = {

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

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,