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Fix undefined symbols in compression

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Dropping unused declarations while compressing sometimes crash.
This is due to the symbols being undefined where the source code
tries to access `sym.definition().id`.
This commit is contained in:
Armagan Amcalar 2017-03-07 03:42:42 +01:00 committed by GitHub
parent d787d70127
commit 1874ece864
1 changed files with 1 additions and 0 deletions
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lib/compress.js
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@ -1804,6 +1804,7 @@ merge(Compressor.prototype, {
if (!compressor.option("keep_fargs")) { if (!compressor.option("keep_fargs")) {
for (var a = node.argnames, i = a.length; --i >= 0;) { for (var a = node.argnames, i = a.length; --i >= 0;) {
var sym = a[i]; var sym = a[i];
if (!sym) break;
if (!(sym.definition().id in in_use_ids)) { if (!(sym.definition().id in in_use_ids)) {
a.pop(); a.pop();
compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", { compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", {