fix(export): Support typescript namespaces

[bradzacher]

Fixes #1300

• Added nested export scope support
• Fixed broken test on ESLint v3 caused by old typescript parser

[coveralls]

Coverage increased (+0.2%) to 97.981% when pulling 5a1db48 on bradzacher:export-ts-namespaces into 405900e on benmosher:master.

[coveralls]

Coverage increased (+0.2%) to 97.981% when pulling 5a1db48 on bradzacher:export-ts-namespaces into 405900e on benmosher:master.

[coveralls]

Coverage increased (+0.2%) to 97.981% when pulling 5a1db48 on bradzacher:export-ts-namespaces into 405900e on benmosher:master.

[coveralls]

Coverage increased (+0.2%) to 97.981% when pulling 5a1db48 on bradzacher:export-ts-namespaces into 405900e on benmosher:master.

[coveralls]

Coverage increased (+0.1%) to 97.981% when pulling 988e12b on bradzacher:export-ts-namespaces into 70c3679 on benmosher:master.

[ljharb]

Hmm, I just pushed up a commit to deal with "Fixed broken test on ESLint v3 caused by old typescript parser" by skipping the test on eslint < 4. Does that mean this PR fixes the test so it passes? If so, please rebase and revert my change in the process :-)

[ljharb]

Thanks!

[bradzacher]

@ljharb - rebased on top!

Yeah the error was happening because in the old version of typescript which got installed with eslint v3 produced a different AST, hence that case wasn't handled. Not sure why it worked fine on the PR then failed on master.