should set the rollup options: external: null as default

[teazean]

As rollup document pointer: https://github.com/rollup/rollup/wiki/JavaScript-API#external

external should be : - function: the param when called is the moduleName - array: a list of moduleName

Please notice: external is something refered to moduleName not containing the ext, for example

we write

import './foo'

the moduleName is ./foo

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and also i has debug the rollup source , it actually act as above, you can see it @Bundle.js/fetchAllDependencies.

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So in the rollup loader , you shouldn't judge a module is an external-module by the ext. As default you set external: RegExp().test.bind(/^(.(?!\.(js|es|es6)$))*$/) which leads to that rollup only process the only js file. But when we use the rollup loader, we just want a bundle not a single file transpiled by babel, so I suggest do non't set the external option.