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fix corner cases in typeofs (#5286)

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This commit is contained in:
Alex Lam S.L
2022-01-11 05:13:46 +00:00
committed by GitHub
parent 082013c20f
commit f639a30bd2
2 changed files with 174 additions and 5 deletions
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36
lib/compress.js
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@@ -8764,14 +8764,40 @@ Compressor.prototype.compress = function(node) {
return;
}
if (!body) return;
var abort = false;
var def = sym.definition();
var tw = new TreeWalker(function(node) {
if (node instanceof AST_Scope) {
var parent = tw.parent();
if (parent instanceof AST_Call && parent.expression === node) return;
var fn;
var tw = new TreeWalker(function(node, descend) {
if (abort) return true;
if (node instanceof AST_Assign) {
var ref = node.left;
if (!(ref instanceof AST_SymbolRef && ref.definition() === def)) return;
node.right.walk(tw);
switch (node.operator) {
case "=":
case "&&=":
abort = true;
}
return true;
}
if (node instanceof AST_Call) {
descend();
fn = node.expression.tail_node();
if (fn instanceof AST_Lambda) {
fn.walk(tw);
} else {
abort = true;
}
return true;
}
if (node instanceof AST_Scope) {
if (node === fn) return;
return true;
}
if (node instanceof AST_SymbolRef) {
if (node.definition() === def) node.defined = true;
return true;
}
if (node instanceof AST_SymbolRef && node.definition() === def) node.defined = true;
});
body.walk(tw);