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fix: don't fail if definition is undefined

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Running `uglifyjs --verbose --compress --mangle --screw-ie8 class.js`
with
`class.js`:
```
class Foo {
  bar() {
  }
}
```
Fails with:
```
undefined:4041
  return this.definition().unmangleable(options);
TypeError: Cannot read property 'unmangleable' of undefined
    at AST_Node.eval [as unmangleable] (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:4041:27)
    at Object.eval [as visit] (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:4214:53)
    at Object.TreeWalker._visit (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1493:24)
    at AST_Node.DEFNODE._walk (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:415:24)
    at AST_Node.eval (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:775:38)
    at Object.TreeWalker._visit (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1497:21)
    at AST_Node.DEFNODE._walk (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:774:24)
    at eval (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1303:22)
    at Array.forEach (native)
    at AST_Node.eval (eval at <anonymous> (/Users/craverod/opensource/panels/panels/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1302:29)
```
This PR sorts it out (it gives me: `class Foo{bar(){}}`) but it feels like the wrong hack.
I don't know what's best and whether we can even try to mangle the method or not, mainly because
it's the classes' external API and doing so would prevent others from using it outside the minified
source.
Thoughts?
This commit is contained in:
Darío Javier Cravero 2016-02-04 21:54:21 +00:00
parent 2827fa8699
commit 1fa4a660c7
1 changed files with 2 additions and 1 deletions
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3
lib/scope.js
View File

@ -350,7 +350,8 @@ AST_Scope.DEFMETHOD("references", function(sym){
});
AST_Symbol.DEFMETHOD("unmangleable", function(options){
return this.definition().unmangleable(options);
var def = this.definition();
return def && def.unmangleable(options);
});
// property accessors are not mangleable