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fix corner case in reduce_vars (#3775)

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fixes #3774
This commit is contained in:
Alex Lam S.L
2020-04-10 19:19:38 +01:00
committed by GitHub
parent 3d72663689
commit dce9dfce0e
2 changed files with 52 additions and 11 deletions
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9
lib/compress.js
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@@ -318,7 +318,7 @@ merge(Compressor.prototype, {
if (value instanceof AST_RegExp) return native_fns.RegExp[name] && !value.value.global;
}
function is_modified(compressor, tw, node, value, level, immutable) {
function is_modified(compressor, tw, node, value, level, immutable, recursive) {
var parent = tw.parent(level);
if (compressor.option("unsafe") && parent instanceof AST_Dot && is_read_only_fn(value, parent.property)) {
return;
@@ -342,7 +342,7 @@ merge(Compressor.prototype, {
}
if (parent instanceof AST_PropAccess && parent.expression === node) {
var prop = read_property(value, parent);
return !immutable && is_modified(compressor, tw, parent, prop, level + 1);
return (!immutable || recursive) && is_modified(compressor, tw, parent, prop, level + 1);
}
}
@@ -759,7 +759,8 @@ merge(Compressor.prototype, {
d.fixed = false;
} else if (d.fixed) {
value = this.fixed_value();
if (recursive_ref(tw, d)) {
var recursive = recursive_ref(tw, d);
if (recursive) {
d.recursive_refs++;
} else if (value && ref_once(tw, compressor, d)) {
d.single_use = value instanceof AST_Lambda && !value.pinned()
@@ -767,7 +768,7 @@ merge(Compressor.prototype, {
} else {
d.single_use = false;
}
if (is_modified(compressor, tw, this, value, 0, is_immutable(value))) {
if (is_modified(compressor, tw, this, value, 0, is_immutable(value), recursive)) {
if (d.single_use) {
d.single_use = "m";
} else {