Add support for export * statements in remark-mdx (#911)

Author: just-be-dev

packages/remark-mdx/extract-imports-and-exports.js

@@ -22,6 +22,10 @@ class BabelPluginExtractImportsAndExports {
             const {start} = path.node
             nodes.push({type: 'export', start})
           },
+          ExportAllDeclaration(path) {
+            const {start} = path.node
+            nodes.push({type: 'export', start})
+          },
           ImportDeclaration(path) {
             const {start} = path.node
 

packages/remark-mdx/test/__snapshots__/import-export.test.js.snap

@@ -35,6 +35,17 @@ Array [
 ]
 `;
 
+exports[`Handles export all 1`] = `
+Array [
+  Object {
+    "type": "export",
+    "value": Array [
+      "export * from './foo'",
+    ],
+  },
+]
+`;
+
 exports[`Handles multiline default exports 1`] = `
 Array [
   Object {

packages/remark-mdx/test/fixtures/import-export.js

@@ -25,5 +25,9 @@ module.exports = [
   {
     description: 'Handles multiline default exports',
     mdx: ['export default props => (', '  <main {...props} />', ')'].join('\n')
+  },
+  {
+    description: 'Handles export all',
+    mdx: ["export * from './foo'"]
   }
 ]