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workaround bug in ECMAScript specification (#4656)

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closes #4655
This commit is contained in:
Alex Lam S.L
2021-02-16 15:39:06 +00:00
committed by GitHub
parent fa8aa204a0
commit 6a2bda52f3
2 changed files with 34 additions and 5 deletions
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12
lib/compress.js
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@@ -5017,20 +5017,22 @@ merge(Compressor.prototype, {
return self;
});
function trim_block(node, in_list) {
function trim_block(node, parent, in_list) {
switch (node.body.length) {
case 0:
return in_list ? List.skip : make_node(AST_EmptyStatement, node);
case 1:
var stat = node.body[0];
if (!(stat instanceof AST_Const || stat instanceof AST_Let)) return stat;
if (stat instanceof AST_Const || stat instanceof AST_Let) return node;
if (parent instanceof AST_IterationStatement && stat instanceof AST_LambdaDefinition) return node;
return stat;
}
return node;
}
OPT(AST_BlockStatement, function(self, compressor) {
self.body = tighten_body(self.body, compressor);
return trim_block(self);
return trim_block(self, compressor.parent());
});
function drop_rest_farg(fn, compressor) {
@@ -6123,7 +6125,7 @@ merge(Compressor.prototype, {
}
}, function(node, in_list) {
if (node instanceof AST_BlockStatement) {
return trim_block(node, in_list);
return trim_block(node, tt.parent(), in_list);
} else if (node instanceof AST_For) {
// Certain combination of unused name + side effect leads to invalid AST:
// https://github.com/mishoo/UglifyJS/issues/44
@@ -7282,7 +7284,7 @@ merge(Compressor.prototype, {
break;
}
}
self.body = trim_block(self.body);
self.body = trim_block(self.body, compressor.parent());
}
if (self.body instanceof AST_EmptyStatement) return make_node(AST_For, self, self).optimize(compressor);
if (self.body instanceof AST_SimpleStatement) return make_node(AST_For, self, {