[next] Revert to use ecma 5 in uglifyOptions#4234

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Timer merged 3 commits intofacebook:nextfrom

danielberndt:patch-1

Apr 2, 2018

Commits on Mar 31, 2018

Revert to use ecma 5 in uglifyOptions
danielberndt
authored

Commits on Apr 1, 2018

remove explicit ecma version from uglifyOptions settings
danielberndt
authored

Commits on Apr 2, 2018

be explicit of where we use ecma: 8 and ecma: 5
danielberndt
authored