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fix corner case in dead_code (#5507)

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fixes #5506
This commit is contained in:
Alex Lam S.L
2022-06-11 22:26:51 +01:00
committed by GitHub
parent 053cb27fe3
commit 99946a3993
4 changed files with 99 additions and 3 deletions
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8
lib/compress.js
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@@ -12329,7 +12329,7 @@ Compressor.prototype.compress = function(node) {
parent = compressor.parent(level++);
if (parent instanceof AST_Assign) {
if (parent.left instanceof AST_SymbolRef && parent.left.definition() === def) {
if (in_try(level, parent)) break;
if (in_try(level, parent, !local)) break;
return strip_assignment(def);
}
if (parent.left.match_symbol(function(node) {
@@ -12441,14 +12441,16 @@ Compressor.prototype.compress = function(node) {
if (parent instanceof AST_Try) return parent.bfinally ? parent.bfinally === stat : parent.bcatch === stat;
}
function in_try(level, node) {
function in_try(level, node, sync) {
var right = self.right;
self.right = make_node(AST_Null, right);
var may_throw = node.may_throw(compressor);
self.right = right;
for (var parent; parent = compressor.parent(level++); node = parent) {
if (parent === scope) return false;
if (parent instanceof AST_Try) {
if (sync && parent instanceof AST_Lambda) {
if (parent.name || is_async(parent) || is_generator(parent)) return true;
} else if (parent instanceof AST_Try) {
if (parent.bfinally && parent.bfinally !== node) return true;
if (may_throw && parent.bcatch && parent.bcatch !== node) return true;
}