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Prepack emits if-statements with no consequent or alternate code

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#2,220 建立於 2018年7月6日

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 (3 留言) (0 反應) (0 負責人)JavaScript (14,268 star) (520 fork)batch import
Instant Renderenhancementhelp wantedlevel 1 (super easy)priority: lowserializer

描述

This

(function () {
  let n = global.__abstract ? __abstract("number", "23") : 23;
  if (n === 42) {
    let d = Date.now(); // dead pure generator entry
  }
})();

prepacks to

if (23 === 42) {}

which is obviously suboptimal.

During its fixpoint computation, the visitor should not visit the condition until at least one generator entry cannot be omitted.

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