JoBoEVD/UglifyJS
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix corner cases in collapse_vars & dead_code (#4052)

Browse Source 
fixes #4051
This commit is contained in:
Alex Lam S.L
2020-08-16 22:54:27 +01:00
committed by GitHub
parent 45ab3b51d8
commit 23f0dca992
3 changed files with 50 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
lib/compress.js
View File

@@ -1834,7 +1834,9 @@ merge(Compressor.prototype, {
if (parent instanceof AST_SimpleStatement) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Switch) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Unary) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_VarDef) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_VarDef) {
return may_throw(parent) ? node : find_stop_unused(parent, level + 1);
}
return null;
}
@@ -7920,12 +7922,17 @@ merge(Compressor.prototype, {
}
}
} else if (self.left instanceof AST_SymbolRef) {
if (self.operator == "=" && self.left.equivalent_to(self.right)) return self.right;
var parent;
if (self.operator == "=" && self.left.equivalent_to(self.right)
&& !((parent = compressor.parent()) instanceof AST_UnaryPrefix && parent.operator == "delete")) {
return self.right;
}
if (self.left.is_immutable()) return strip_assignment();
var def = self.left.definition();
var scope = def.scope.resolve();
var local = scope === compressor.find_parent(AST_Lambda);
var level = 0, node, parent = self;
var level = 0, node;
parent = self;
do {
node = parent;
parent = compressor.parent(level++);