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fix corner case in collapse_vars & reduce_vars (#4748)

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fixes #4747
This commit is contained in:
Alex Lam S.L
2021-03-07 02:33:51 +00:00
committed by GitHub
parent c7520b4b97
commit 397e48b97e
2 changed files with 42 additions and 7 deletions
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20
lib/compress.js
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@@ -5188,6 +5188,12 @@ merge(Compressor.prototype, {
fn.rest = null;
}
OPT(AST_Lambda, function(self, compressor) {
drop_rest_farg(self, compressor);
self.body = tighten_body(self.body, compressor);
return self;
});
function opt_arrow(self, compressor) {
if (!compressor.option("arrows")) return self;
drop_rest_farg(self, compressor);
@@ -5210,12 +5216,6 @@ merge(Compressor.prototype, {
OPT(AST_Arrow, opt_arrow);
OPT(AST_AsyncArrow, opt_arrow);
OPT(AST_Defun, function(self, compressor) {
drop_rest_farg(self, compressor);
self.body = tighten_body(self.body, compressor);
return self;
});
OPT(AST_Function, function(self, compressor) {
drop_rest_farg(self, compressor);
self.body = tighten_body(self.body, compressor);
@@ -10389,7 +10389,13 @@ merge(Compressor.prototype, {
}
}));
} else {
value = fixed.optimize(compressor);
if (fixed instanceof AST_Scope) {
compressor.push(fixed);
value = fixed.optimize(compressor);
compressor.pop();
} else {
value = fixed.optimize(compressor);
}
if (value === fixed) value = value.transform(new TreeTransformer(function(node, descend) {
if (node instanceof AST_Scope) return node;
node = node.clone();

29
test/compress/awaits.js
View File

@@ -1379,3 +1379,32 @@ issue_4738_3: {
expect_stdout: "PASS"
node_version: ">=8"
}
issue_4747: {
options = {
collapse_vars: true,
reduce_vars: true,
unused: true,
}
input: {
console.log(function(a) {
async function f() {
a = "PASS";
null.p += "PASS";
}
f();
return a;
}("FAIL"));
}
expect: {
console.log(function(a) {
(async function() {
a = "PASS";
null.p += "PASS";
})();
return a;
}("FAIL"));
}
expect_stdout: "PASS"
node_version: ">=8"
}