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fix corner case in collapse_vars (#3521)

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fixes #3520
This commit is contained in:
Alex Lam S.L
2019-10-24 01:13:57 +08:00
committed by GitHub
parent 370c8e0385
commit 0f7aa41e33
3 changed files with 43 additions and 4 deletions
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6
lib/compress.js
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@@ -1128,6 +1128,8 @@ merge(Compressor.prototype, {
if (!stop_if_hit && in_conditional(node, parent)) {
stop_if_hit = parent;
}
// Skip transient nodes caused by single-use variable replacement
if (node.single_use && parent instanceof AST_VarDef && parent.value === node) return node;
// Replace variable with assignment when found
var hit_rhs;
if (can_replace
@@ -3737,9 +3739,7 @@ merge(Compressor.prototype, {
def.value = null;
head.push(def);
} else {
var value = def.value
&& !def.value.single_use
&& def.value.drop_side_effect_free(compressor);
var value = def.value && def.value.drop_side_effect_free(compressor);
if (value) {
AST_Node.warn("Side effects in initialization of unused variable {name} [{file}:{line},{col}]", template(def.name));
side_effects.push(value);