More helpful error message for missing decoratorsBeforeExport in pars…

…er (#8576)
babel · Aug 29, 2018 · 9d244ae · 9d244ae
1 parent 04d09cc
commit 9d244ae
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/packages/babel-parser/src/plugin-utils.js b/packages/babel-parser/src/plugin-utils.js
@@ -55,8 +55,10 @@ export function validatePlugins(plugins: PluginList) {
     );
     if (decoratorsBeforeExport == null) {
       throw new Error(
-        "The 'decorators' plugin requires a" +
-          " 'decoratorsBeforeExport' option, whose value must be a boolean.",
+        "The 'decorators' plugin requires a 'decoratorsBeforeExport' option," +
+          " whose value must be a boolean. If you are migrating from" +
+          " Babylon/Babel 6 or want to use the old decorators proposal, you" +
+          " should use the 'decorators-legacy' plugin instead of 'decorators'.",
       );
     } else if (typeof decoratorsBeforeExport !== "boolean") {
       throw new Error("'decoratorsBeforeExport' must be a boolean.");

diff --git a/...rser/test/fixtures/experimental/decorators-2/decoratorsBeforeExport-required/options.json b/...rser/test/fixtures/experimental/decorators-2/decoratorsBeforeExport-required/options.json
@@ -1,4 +1,4 @@
 {
   "plugins": ["decorators"],
-  "throws": "The 'decorators' plugin requires a 'decoratorsBeforeExport' option, whose value must be a boolean."
+  "throws": "The 'decorators' plugin requires a 'decoratorsBeforeExport' option, whose value must be a boolean. If you are migrating from Babylon/Babel 6 or want to use the old decorators proposal, you should use the 'decorators-legacy' plugin instead of 'decorators'."
 }