diff options
| -rw-r--r-- | lib/compress.js | 3 | ||||
| -rw-r--r-- | test/compress/spreads.js | 20 |
2 files changed, 23 insertions, 0 deletions
diff --git a/lib/compress.js b/lib/compress.js index fadd7415..01ec7e60 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -5766,6 +5766,9 @@ merge(Compressor.prototype, { var write_only = def.value.write_only; var value = def.value.drop_side_effect_free(compressor); if (def.value !== value) { + sym.references.forEach(function(node) { + if (node.fixed === sym.fixed) node.fixed = def.value; + }); def.value = null; if (value) { AST_Node.warn("Side effects in last use of variable {name} [{file}:{line},{col}]", template(def.name)); diff --git a/test/compress/spreads.js b/test/compress/spreads.js index 1e4dcbf6..7c98fdcd 100644 --- a/test/compress/spreads.js +++ b/test/compress/spreads.js @@ -826,3 +826,23 @@ issue_4363: { expect_stdout: "PASS" node_version: ">=8" } + +issue_4556: { + options = { + reduce_vars: true, + unused: true, + } + input: { + console.log(function() { + var a = "" + [ a++ ]; + var b = [ ...a ]; + }()); + } + expect: { + console.log(function() { + var a; + }()); + } + expect_stdout: "undefined" + node_version: ">=6" +} |