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improve performance when handling unused variables in collapse_vars (#3084)

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fixes #3082
This commit is contained in:
Alex Lam S.L
2018-04-15 12:38:31 +08:00
committed by GitHub
parent eaa2c1f6af
commit 7362f57966
1 changed files with 2 additions and 1 deletions
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3
lib/compress.js
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@@ -1348,8 +1348,9 @@ merge(Compressor.prototype, {
if (expr instanceof AST_VarDef) {
var def = expr.name.definition();
if (!member(expr.name, def.orig)) return;
var declared = def.orig.length - def.eliminated;
var referenced = def.references.length - def.replaced;
if (!referenced) return;
var declared = def.orig.length - def.eliminated;
if (declared > 1 && !(expr.name instanceof AST_SymbolFunarg)
|| (referenced > 1 ? mangleable_var(expr) : !compressor.exposed(def))) {
return make_node(AST_SymbolRef, expr.name, expr.name);