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fix corner case in merge_vars (#5320)

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fixes #5319
This commit is contained in:
Alex Lam S.L
2022-01-28 08:05:57 +00:00
committed by GitHub
parent e4a91a89e0
commit 18f00457f6
4 changed files with 76 additions and 0 deletions
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12
lib/compress.js
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@@ -5927,6 +5927,16 @@ Compressor.prototype.compress = function(node) {
var references = Object.create(null);
var prev = Object.create(null);
var tw = new TreeWalker(function(node, descend) {
if (node.variables) {
if (node instanceof AST_BlockStatement) {
var save_scope = segment.scope;
segment.scope = node;
descend();
segment.scope = save_scope;
return true;
}
segment.scope = node;
}
if (node instanceof AST_Assign) {
var lhs = node.left;
var rhs = node.right;
@@ -6298,6 +6308,7 @@ Compressor.prototype.compress = function(node) {
var refs = references[def.id];
if (!refs) return;
if (refs.start.block !== seg.block) return references[def.id] = false;
sym.scope = seg.scope;
refs.push(sym);
refs.end = seg;
if (def.id in prev) {
@@ -6312,6 +6323,7 @@ Compressor.prototype.compress = function(node) {
return references[def.id] = false;
} else {
var refs = declarations.get(def.id) || [];
sym.scope = seg.scope;
refs.push(sym);
references[def.id] = refs;
if (!read) {