OIL-89: optimize js

[coveralls]

Pull Request Test Coverage Report for Build 375

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 22.151%

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Files with Coverage Reduction	New Missed Lines	%
dist/oil.bundle.js	2	22.15%
<!--	Total:	2		-->

Totals
Change from base Build 363:	-0.1%
Covered Lines:	908
Relevant Lines:	3281

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💛 - Coveralls