From 29bc56ee2f7ef4bd6a4b6b3cc4d53e56c1154c13 Mon Sep 17 00:00:00 2001
From: Jakub Stasiak <kubafr2@gmail.com>
Date: Thu, 3 Nov 2016 12:11:52 +0100
Subject: [PATCH] Ignoring flow type exports (#639)

* Ignoring flow type exports, resolve #484

* Added test and note to CHANGELOG
---
 CHANGELOG.md                             | 1 +
 src/rules/prefer-default-export.js       | 3 +++
 tests/src/rules/prefer-default-export.js | 5 +++++
 3 files changed, 9 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92d9103a7..fe177227d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 - [`no-extraneous-dependencies`]: check globs against CWD + absolute path ([#602] + [#630], thanks [@ljharb])
 
 ### Fixed
+- [`prefer-default-export`] handles flow `export type` ([#484])
 - [`prefer-default-export`] handles re-exported default exports ([#609])
 - Fix crash when using [`newline-after-import`] with decorators ([#592])
 - Properly report [`newline-after-import`] when next line is a decorator
diff --git a/src/rules/prefer-default-export.js b/src/rules/prefer-default-export.js
index c1243bf49..fe01adbe2 100644
--- a/src/rules/prefer-default-export.js
+++ b/src/rules/prefer-default-export.js
@@ -42,6 +42,9 @@ module.exports = {
         // if there are specifiers, node.declaration should be null
         if (!node.declaration) return
 
+        // don't count flow types exports
+        if (node.exportKind === 'type') return
+
         if (node.declaration.declarations) {
           node.declaration.declarations.forEach(function(declaration) {
             captureDeclaration(declaration.id)
diff --git a/tests/src/rules/prefer-default-export.js b/tests/src/rules/prefer-default-export.js
index 609288e49..5f61748f1 100644
--- a/tests/src/rules/prefer-default-export.js
+++ b/tests/src/rules/prefer-default-export.js
@@ -66,6 +66,11 @@ ruleTester.run('prefer-default-export', rule, {
         import * as foo from './foo';`,
       }),
 
+    test({
+      code: `export type UserId = number;`,
+      parser: 'babel-eslint',
+      }),
+
     // ...SYNTAX_CASES,
   ],
   invalid: [