es3-safe-recast 

Recasts all [ECMAScript 3][1] reserved words to their safe alternatives.

Optionally removes trailing commas in object and array literals (pass { trailingComma: true } as the second argument to compile).

helpers

* grunt-es3-safe-recast
* gulp-dereserve
* broccoli-es3-safe-recast

Before

``js
ajax('/asdf/1').catch(function(reason) {

}).finally(function() {

});
`

After

`js
ajax('/asdf/1')'catch' {

})'finally' {

});
`

Before

`js
object = {
catch: function() {},
finally: function() {},
default: function() {}
};
`

After

`js
object = {
'catch': function() {},
'finally': function() {},
'default': function() {}
};
``

[1]: http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf