leave file in output directory when build fail

[zh99998]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Desired functionality.

I got a error in build time

ERROR in main.5ab8f909c72c397a5791.bundle.js from UglifyJs
Unexpected token: punc (}) [main.5ab8f909c72c397a5791.bundle.js:217,0]

well...this is hard to debug, no detail, no file, I can't know what happens.
seems there is a npm module using es6 syntax and uglifyjs, but don't know which module do that.

request add a feature to keep output files when build fail.

[filipesilva]

I agree it's confusing, but truth is that on uglify errors like this one there never is a file on disk to leave, it's all in memory.

[filipesilva]

Ah, here is the original issue for this problem and the real answer: #5741 (comment)

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