From 0bac644b25a09d6f02ae90d58152e9dbbc9bef4b Mon Sep 17 00:00:00 2001
From: Yang Zhang <yaaang@gmail.com>
Date: Wed, 27 Feb 2019 18:30:46 -0800
Subject: [PATCH] Allow component names to start with _

Fixes #424
---
 src/transformers/JSXTransformer.ts |  2 +-
 test/jsx-test.ts                   | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/transformers/JSXTransformer.ts b/src/transformers/JSXTransformer.ts
index 09bac056..c53d82bd 100644
--- a/src/transformers/JSXTransformer.ts
+++ b/src/transformers/JSXTransformer.ts
@@ -252,7 +252,7 @@ export default class JSXTransformer extends Transformer {
 }
 
 export function startsWithLowerCase(s: string): boolean {
-  return s[0] === s[0].toLowerCase();
+  return s[0] !== s[0].toUpperCase();
 }
 
 /**
diff --git a/test/jsx-test.ts b/test/jsx-test.ts
index d8f237ba..b5c9044d 100644
--- a/test/jsx-test.ts
+++ b/test/jsx-test.ts
@@ -37,6 +37,17 @@ describe("transform JSX", () => {
     );
   });
 
+  it("handles component names starting with _", () => {
+    assertResult(
+      `
+      <_Foo />
+    `,
+      `${JSX_PREFIX}
+      React.createElement(_Foo, {${devProps(2)}} )
+    `,
+    );
+  });
+
   it("transforms nested JSX elements", () => {
     assertResult(
       `