Henry Zhu 253918c30f Fix buildExportAll to account for commonjs/amd/systemjs (#3591)
* Fix buildExportAll to account for commonjs/amd

If the re-exported module was generated with Babel and it is a commonjs or amd module and so is the current module, this will result in an attempt to redefine the __esModule property, which throws a runtime error.

* Add test: don't overwrite __esModule on re-export

(Failing.)

* fixup tests

* Add fix for systemjs
2016-07-23 13:21:07 -04:00
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