refactor(compiler-core): avoid has call (vuejs#314)

pikax · yyx990803 · commit 6607edab2da8 · 2019-10-16T10:46:41.000-04:00
diff --git a/packages/compiler-core/src/transforms/hoistStatic.ts b/packages/compiler-core/src/transforms/hoistStatic.ts
@@ -116,8 +116,9 @@ function isStaticNode(
       if (node.tagType !== ElementTypes.ELEMENT) {
         return false
       }
-      if (resultCache.has(node)) {
-        return resultCache.get(node)!
+      const cached = resultCache.get(node)
+      if (cached !== undefined) {
+        return cached
       }
       const flag = getPatchFlag(node)
       if (!flag || flag === PatchFlags.TEXT) {

Original file line number	Diff line number	Diff line change
`@@ -116,8 +116,9 @@ function isStaticNode(`
`116`	`116`	`if (node.tagType !== ElementTypes.ELEMENT) {`
`117`	`117`	`return false`
`118`	`118`	`}`
`119`		`- if (resultCache.has(node)) {`
`120`		`- return resultCache.get(node)!`
	`119`	`+ const cached = resultCache.get(node)`
	`120`	`+ if (cached !== undefined) {`
	`121`	`+ return cached`
`121`	`122`	`}`
`122`	`123`	`const flag = getPatchFlag(node)`
`123`	`124`	`if (!flag \|\| flag === PatchFlags.TEXT) {`