feat: support export namespace from syntax (resolves #84)

package.json

@@ -25,6 +25,7 @@
   "devDependencies": {
     "@babel/core": "^7.19.1",
     "@babel/plugin-proposal-decorators": "^7.19.1",
+    "@babel/plugin-proposal-export-namespace-from": "^7.18.9",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.18.6",
     "@babel/plugin-proposal-optional-chaining": "^7.18.9",
     "@babel/plugin-syntax-class-properties": "^7.12.13",

src/babel.ts

@@ -15,7 +15,8 @@ export default function transform (opts: TransformOptions): TRANSFORM_RESULT {
       [require('@babel/plugin-transform-modules-commonjs'), { allowTopLevelThis: true }],
       [require('babel-plugin-dynamic-import-node'), { noInterop: true }],
       [TransformImportMetaPlugin, { filename: opts.filename }],
-      [require('@babel/plugin-syntax-class-properties')]
+      [require('@babel/plugin-syntax-class-properties')],
+      [require('@babel/plugin-proposal-export-namespace-from')]
     ]
   }
 

test/__snapshots__/fixtures.test.ts.snap

@@ -47,7 +47,8 @@ TypeError: The \\"listener\\" argument must be of type function. Received undefi
 exports[`fixtures > error-runtime > stdout 1`] = `""`;
 
 exports[`fixtures > esm > stdout 1`] = `
-"{
+"{ utilsLib: { utils: { a: 'a', default: 'default' }, version: '123' } }
+{
   file: '<cwd>/test.js',
   dir: '<cwd>',
   'import.meta.url': 'file://<cwd>/test.js',

test/fixtures/esm/index.js

@@ -1,3 +1,7 @@
 import test from './test'
 
+import * as utilsLib from './utilsLib'
+
+console.log({ utilsLib })
+
 console.log(test())

test/fixtures/esm/utils.js

@@ -0,0 +1,2 @@
+export const a = 'a'
+export default 'default'

test/fixtures/esm/utilsLib.js

@@ -0,0 +1,3 @@
+export const version = '123'
+
+export * as utils from './utils'