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fix corner cases in conditionals & if_return (#5680)

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fixes #5679
This commit is contained in:
Alex Lam S.L
2022-09-26 18:28:03 +01:00
committed by GitHub
parent 8ca40070a4
commit 8e65413b99
2 changed files with 241 additions and 11 deletions
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32
lib/compress.js
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@@ -3632,7 +3632,8 @@ Compressor.prototype.compress = function(node) {
var value = stat.body.value;
var in_bool = stat.body.in_bool || next instanceof AST_Return && next.in_bool;
// if (foo()) return x; return y; ---> return foo() ? x : y;
if (!stat.alternative && next instanceof AST_Return) {
if (!stat.alternative && next instanceof AST_Return
&& (!value == !next.value || !in_async_generator(in_lambda))) {
changed = true;
stat = stat.clone();
stat.alternative = make_node(AST_BlockStatement, next, {
@@ -9677,16 +9678,25 @@ Compressor.prototype.compress = function(node) {
alternative: null,
});
if (self.alternative instanceof AST_Exit && self.body.TYPE == self.alternative.TYPE) {
var exit = make_node(self.body.CTOR, self, {
value: make_node(AST_Conditional, self, {
condition: self.condition,
consequent: self.body.value || make_node(AST_Undefined, self.body).transform(compressor),
alternative: self.alternative.value
|| make_node(AST_Undefined, self.alternative).transform(compressor),
}),
});
if (exit instanceof AST_Return) exit.in_bool = self.body.in_bool || self.alternative.in_bool;
return exit;
var cons_value = self.body.value;
var alt_value = self.alternative.value;
if (!cons_value && !alt_value) return make_node(AST_BlockStatement, self, {
body: [
make_node(AST_SimpleStatement, self, { body: self.condition }),
self.body,
],
}).optimize(compressor);
if (cons_value && alt_value || !in_async_generator(compressor.find_parent(AST_Scope))) {
var exit = make_node(self.body.CTOR, self, {
value: make_node(AST_Conditional, self, {
condition: self.condition,
consequent: cons_value || make_node(AST_Undefined, self.body).transform(compressor),
alternative: alt_value || make_node(AST_Undefined, self.alternative).transform(compressor),
}),
});
if (exit instanceof AST_Return) exit.in_bool = self.body.in_bool || self.alternative.in_bool;
return exit;
}
}
if (self.body instanceof AST_If && !self.body.alternative && !self.alternative) {
self = make_node(AST_If, self, {