diff options
Diffstat (limited to 'lib/compress.js')
| -rw-r--r-- | lib/compress.js | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/compress.js b/lib/compress.js index 8b5b020d..3d857190 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -1307,6 +1307,10 @@ merge(Compressor.prototype, { return found; }); + function in_async_generator(scope) { + return scope instanceof AST_AsyncGeneratorDefun || scope instanceof AST_AsyncGeneratorFunction; + } + function find_scope(compressor) { var level = 0, node; while (node = compressor.parent(level++)) { @@ -2987,7 +2991,9 @@ merge(Compressor.prototype, { var stat = statements[i]; if (prev) { if (stat instanceof AST_Exit) { - stat.value = cons_seq(stat.value || make_node(AST_Undefined, stat)).transform(compressor); + if (stat.value || !in_async_generator(scope)) { + stat.value = cons_seq(stat.value || make_node(AST_Undefined, stat)).transform(compressor); + } } else if (stat instanceof AST_For) { if (!(stat.init instanceof AST_Definitions)) { var abort = false; @@ -11045,7 +11051,10 @@ merge(Compressor.prototype, { }); OPT(AST_Return, function(self, compressor) { - if (self.value && is_undefined(self.value, compressor)) { + if (compressor.option("side_effects") + && self.value + && is_undefined(self.value, compressor) + && !in_async_generator(compressor.find_parent(AST_Scope))) { self.value = null; } return self; |