Throw error on TypeScript declare const enum (#11410)

Throw error on `const enum` even if it has `declare`. Resolves: #10785
babel · Apr 23, 2020 · 9b71651 · 9b71651
1 parent a34424a
commit 9b71651
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Showing 3 changed files with 6 additions and 4 deletions.
diff --git a/packages/babel-plugin-transform-typescript/src/enum.js b/packages/babel-plugin-transform-typescript/src/enum.js
@@ -3,15 +3,15 @@ import { template } from "@babel/core";
 
 export default function transpileEnum(path, t) {
   const { node } = path;
+  if (node.const) {
+    throw path.buildCodeFrameError("'const' enums are not supported.");
+  }
+
   if (node.declare) {
     path.remove();
     return;
   }
 
-  if (node.const) {
-    throw path.buildCodeFrameError("'const' enums are not supported.");
-  }
-
   const name = node.id.name;
   const fill = enumFill(path, t, node.id);
 

diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/declarations/const-enum/input.ts b/packages/babel-plugin-transform-typescript/test/fixtures/declarations/const-enum/input.ts
@@ -0,0 +1 @@
+declare const enum E {}
diff --git a/...ages/babel-plugin-transform-typescript/test/fixtures/declarations/const-enum/options.json b/...ages/babel-plugin-transform-typescript/test/fixtures/declarations/const-enum/options.json
@@ -0,0 +1 @@
+{ "throws": "'const' enums are not supported." }