Remove unused code or unused features.
删除不用的代码或者特性。
On the other hand, dead, unused code only clutters a program and makes it harder to read and understand, so delete it.
另一方面，无效的，废弃的代码只会使程序变得拥挤不堪，难于阅读和理解，所以还是删掉的好。
Lots of systems suffer from the extremes: clumped, lengthy code with little abstractions, or an overly designed system with unnecessary complexity and unused code.
很多系统的设计会走向极端：缺乏抽象的冗长的代码，或是充斥着复杂的从不使用的代码。
Tree Shaker walks the dependency graph, top to bottom, and shakes out unused code like dead needles in a Christmas tree.
摇树优化器从上到下遍历依赖图谱，并且摇掉用不到的代码，这些代码就像是圣诞树中那些死掉的松针一样。
Tree Shaker walks the dependency graph, top to bottom, and shakes out unused code like dead needles in a Christmas tree.
摇树优化器从上到下遍历依赖图谱，并且摇掉用不到的代码，这些代码就像是圣诞树中那些死掉的松针一样。
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