From d0b02a9dd05ec667a21fc2953a7a2e35ef52093a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Mon, 3 Aug 2020 10:33:45 -0400
Subject: [PATCH] feat(babel): `export * as ns` support (#511)

* declares export * as ns support

* check rollup version

* oof

* refactor: get rollupVersion from this.meta in options hook
---
 packages/babel/src/index.js | 38 +++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/packages/babel/src/index.js b/packages/babel/src/index.js
index 49389d1cb..248226da9 100644
--- a/packages/babel/src/index.js
+++ b/packages/babel/src/index.js
@@ -29,7 +29,7 @@ const unpackOptions = ({
   };
 };
 
-const unpackInputPluginOptions = ({ skipPreflightCheck = false, ...rest }) => {
+const unpackInputPluginOptions = ({ skipPreflightCheck = false, ...rest }, rollupVersion) => {
   if (!rest.babelHelpers) {
     // eslint-disable-next-line no-console
     console.warn(
@@ -45,6 +45,8 @@ const unpackInputPluginOptions = ({ skipPreflightCheck = false, ...rest }) => {
       supportsStaticESM: true,
       supportsDynamicImport: true,
       supportsTopLevelAwait: true,
+      // todo: remove version checks for 1.20 - 1.25 when we bump peer deps
+      supportsExportNamespaceFrom: !rollupVersion.match(/^1\.2[0-5]\./),
       ...rest.caller
     }
   });
@@ -90,22 +92,30 @@ function createBabelInputPluginFactory(customCallback = returnObject) {
       overrides
     );
 
-    const {
-      exclude,
-      extensions,
-      babelHelpers,
-      include,
-      skipPreflightCheck,
-      ...babelOptions
-    } = unpackInputPluginOptions(pluginOptionsWithOverrides);
-
-    const extensionRegExp = new RegExp(`(${extensions.map(escapeRegExpCharacters).join('|')})$`);
-    const includeExcludeFilter = createFilter(include, exclude);
-    const filter = (id) => extensionRegExp.test(id) && includeExcludeFilter(id);
-
+    let babelHelpers, babelOptions, filter, skipPreflightCheck;
     return {
       name: 'babel',
 
+      options() {
+        //todo: remove options hook and hoist declarations when version checks are removed
+        let exclude, include, extensions;
+
+        ({
+          exclude,
+          extensions,
+          babelHelpers,
+          include,
+          skipPreflightCheck,
+          ...babelOptions
+        } = unpackInputPluginOptions(pluginOptionsWithOverrides, this.meta.rollupVersion));
+
+        const extensionRegExp = new RegExp(`(${extensions.map(escapeRegExpCharacters).join('|')})$`);
+        const includeExcludeFilter = createFilter(include, exclude);
+        filter = (id) => extensionRegExp.test(id) && includeExcludeFilter(id);
+
+        return null;
+      },
+
       resolveId(id) {
         if (id !== HELPERS) {
           return null;