From bd8992d53bee647fdb6fb925d6d9fb60053fd842 Mon Sep 17 00:00:00 2001
From: George Zahariev <gkz@fb.com>
Date: Thu, 16 Jul 2020 05:50:31 -0700
Subject: [PATCH] When default exporting a Flow Enum, do not append semicolon
 (#8768)

* When default exporting a Flow Enum, do not append semicolon

* Add changelog entry for #8768
---
 changelog_unreleased/flow/pr-8768.md              | 15 +++++++++++++++
 src/language-js/printer-estree.js                 |  3 ++-
 tests/flow/enums/__snapshots__/jsfmt.spec.js.snap |  2 +-
 3 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 changelog_unreleased/flow/pr-8768.md

diff --git a/changelog_unreleased/flow/pr-8768.md b/changelog_unreleased/flow/pr-8768.md
new file mode 100644
index 000000000..10bcae8f0
--- /dev/null
+++ b/changelog_unreleased/flow/pr-8768.md
@@ -0,0 +1,15 @@
+#### Fix export default of Flow Enum ([#8768](https://github.com/prettier/prettier/pull/8768) by [@gkz](https://github.com/gkz))
+
+Do not add a trailing semicolon if default exporting a Flow Enum.
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+export default enum B {}
+
+// Prettier stable
+export default enum B {};
+
+// Prettier master
+export default enum B {}
+```
diff --git a/src/language-js/printer-estree.js b/src/language-js/printer-estree.js
index df1e70c24..b396a0e50 100644
--- a/src/language-js/printer-estree.js
+++ b/src/language-js/printer-estree.js
@@ -4064,7 +4064,8 @@ function printExportDeclaration(path, options, print) {
       decl.declaration.type !== "TSInterfaceDeclaration" &&
       decl.declaration.type !== "DeclareClass" &&
       decl.declaration.type !== "DeclareFunction" &&
-      decl.declaration.type !== "TSDeclareFunction"
+      decl.declaration.type !== "TSDeclareFunction" &&
+      decl.declaration.type !== "EnumDeclaration"
     ) {
       parts.push(semi);
     }
diff --git a/tests/flow/enums/__snapshots__/jsfmt.spec.js.snap b/tests/flow/enums/__snapshots__/jsfmt.spec.js.snap
index a819dc228..fd6a462b8 100644
--- a/tests/flow/enums/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/enums/__snapshots__/jsfmt.spec.js.snap
@@ -153,7 +153,7 @@ export default enum B {}
 
 export enum A {}
 
-export default enum B {};
+export default enum B {}
 
 ================================================================================
 `;