babel5 --> babel6: modules property - ecmascript-6

Question

i'm trying to figure out how to tell babel6 to generate a particular module syntax (amd, commonjs, etc)
this is how i used to specify the module: https://github.com/aurelia/metadata/blob/master/build/tasks/build.js#L48
gulp.task('build-commonjs', function () {
return gulp.src(paths.output + jsName)
.pipe(to5(assign({}, compilerOptions, {modules:'common'})))
.pipe(gulp.dest(paths.output + 'commonjs'));
});
gulp.task('build-amd', function () {
return gulp.src(paths.output + jsName)
.pipe(to5(assign({}, compilerOptions, {modules:'amd'})))
.pipe(gulp.dest(paths.output + 'amd'));
});
babel6 gives me the error: Unknow option: base.modules
appreciate any guidance !! :)
error:
events.js:141
throw er; // Unhandled 'error' event
^
ReferenceError: [BABEL] C:\a\au\metadata\dist\aurelia-metadata.js: Unknown option: base.modules
at Logger.error (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\file\logger.js:41:11)
at OptionManager.mergeOptions (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\file\options\option-manager.js:262:18)
at OptionManager.init (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\file\options\option-manager.js:416:10)
at File.initOptions (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\file\index.js:191:75)
at new File (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\file\index.js:122:22)
at Pipeline.transform (C:\a\au\metadata\node_modules\gulp-babel\node_modules\babel-core\lib\transformation\pipeline.js:42:16)
at DestroyableTransform._transform (C:\a\au\metadata\node_modules\gulp-babel\index.js:32:20)
at DestroyableTransform.Transform._read (C:\a\au\metadata\node_modules\through2\node_modules\readable-stream\lib\_stream_transform.js:172:10)
at DestroyableTransform.Transform._write (C:\a\au\metadata\node_modules\through2\node_modules\readable-stream\lib\_stream_transform.js:160:12)
at doWrite (C:\a\au\metadata\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:335:12)
at writeOrBuffer (C:\a\au\metadata\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:321:5)
at DestroyableTransform.Writable.write (C:\a\au\metadata\node_modules\through2\node_modules\readable-stream\lib\_stream_writable.js:248:11)
at write (C:\a\au\metadata\node_modules\gulp\node_modules\vinyl-fs\node_modules\through2\node_modules\readable-stream\lib\_stream_readable.js:623:24)
at flow (C:\a\au\metadata\node_modules\gulp\node_modules\vinyl-fs\node_modules\through2\node_modules\readable-stream\lib\_stream_readable.js:632:7)
at DestroyableTransform.pipeOnReadable (C:\a\au\metadata\node_modules\gulp\node_modules\vinyl-fs\node_modules\through2\node_modules\readable-stream\lib\_stream_readable.js:664:5)
at emitNone (events.js:67:13)

Answer 1

from #thedark1337 in babeljs slack:
For babel 6 you need to use plugins
https://babeljs.io/docs/plugins/transform-es2015-modules-amd
https://babeljs.io/docs/plugins/transform-es2015-modules-commonjs/
https://babeljs.io/docs/plugins/transform-es2015-modules-systemjs/
also if you haven't, you'll need babel-preset-es2015 as well to transpile from ES2015 to ES5