added instanceOf plugin to preset es2015 (#6257)

* added instanceOf plugin to preset es2015 * fixed test cases
2017-09-18 07:33:42 +10:00
parent f5ad86c5c6
commit 3cdb7d7f0f
18 changed files with 58 additions and 22 deletions
--- a/packages/babel-plugin-transform-es2015-instanceof/src/index.js
+++ b/packages/babel-plugin-transform-es2015-instanceof/src/index.js
@@ -4,12 +4,20 @@ export default function({ types: t }) {
      BinaryExpression(path) {
        const { node } = path;
        if (node.operator === "instanceof") {
-          path.replaceWith(
-            t.callExpression(this.addHelper("instanceof"), [
-              node.left,
-              node.right,
-            ]),
-          );
+          const helper = this.addHelper("instanceof");
+          const isUnderHelper = path.findParent(path => {
+            return (
+              (path.isVariableDeclarator() && path.node.id === helper) ||
+              (path.isFunctionDeclaration() &&
+                path.node.id.name === helper.name)
+            );
+          });
+
+          if (isUnderHelper) {
+            return;
+          } else {
+            path.replaceWith(t.callExpression(helper, [node.left, node.right]));
+          }
        }
      },
    },