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fix corner case in evaluate (#4215)

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fixes #4214
This commit is contained in:
Alex Lam S.L
2020-10-13 19:49:45 +01:00
committed by GitHub
parent c0c04c33bb
commit b7b8435721
2 changed files with 38 additions and 3 deletions
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8
lib/compress.js
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@@ -3804,6 +3804,8 @@ merge(Compressor.prototype, {
if (fn.evaluating) return this;
if (fn.name && fn.name.definition().recursive_refs > 0) return this;
if (this.is_expr_pure(compressor)) return this;
var args = eval_args(this.args);
if (!args && !ignore_side_effects) return this;
var stat = fn.first_statement();
if (!(stat instanceof AST_Return)) {
if (ignore_side_effects) {
@@ -3811,7 +3813,9 @@ merge(Compressor.prototype, {
fn.walk(new TreeWalker(function(node) {
if (found) return true;
if (node instanceof AST_Return) {
if (node.value && node.value.evaluate(compressor, true) !== undefined) found = true;
if (node.value && node.value._eval(compressor, true, cached, depth) !== undefined) {
found = true;
}
return true;
}
if (node instanceof AST_Scope && node !== fn) return true;
@@ -3820,8 +3824,6 @@ merge(Compressor.prototype, {
}
return this;
}
var args = eval_args(this.args);
if (!args && !ignore_side_effects) return this;
var val = stat.value;
if (!val) return;
var cached_args = [];