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fix corner cases with asynchronous generators (#4642)

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fixes #4641
This commit is contained in:
Alex Lam S.L
2021-02-10 15:41:00 +00:00
committed by GitHub
parent f5659f292b
commit 083679bcad
4 changed files with 74 additions and 2 deletions
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13
lib/compress.js
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@@ -1307,6 +1307,10 @@ merge(Compressor.prototype, {
return found;
});
function in_async_generator(scope) {
return scope instanceof AST_AsyncGeneratorDefun || scope instanceof AST_AsyncGeneratorFunction;
}
function find_scope(compressor) {
var level = 0, node;
while (node = compressor.parent(level++)) {
@@ -2987,7 +2991,9 @@ merge(Compressor.prototype, {
var stat = statements[i];
if (prev) {
if (stat instanceof AST_Exit) {
stat.value = cons_seq(stat.value || make_node(AST_Undefined, stat)).transform(compressor);
if (stat.value || !in_async_generator(scope)) {
stat.value = cons_seq(stat.value || make_node(AST_Undefined, stat)).transform(compressor);
}
} else if (stat instanceof AST_For) {
if (!(stat.init instanceof AST_Definitions)) {
var abort = false;
@@ -11045,7 +11051,10 @@ merge(Compressor.prototype, {
});
OPT(AST_Return, function(self, compressor) {
if (self.value && is_undefined(self.value, compressor)) {
if (compressor.option("side_effects")
&& self.value
&& is_undefined(self.value, compressor)
&& !in_async_generator(compressor.find_parent(AST_Scope))) {
self.value = null;
}
return self;