How do I get Object.assign to work with 6to5 polyfill? - ecmascript-6

Question

I am trying to use Object.assign from ES6, but it is always undefined. Here is the file where I am using it:
var Dispatcher = require('./dispatcher.js');
export default Object.assign(Dispatcher.prototype, {
handleViewAction(action) {
this.dispatch({
source: 'VIEW_ACTION',
action: action
});
}
});
And here is the gulp task I am using to transpile the code:
var browserify = require('browserify');
var reactify = require('reactify');
var source = require('vinyl-source-stream')
var to5 = require('6to5ify');
module.exports = function(gulp, config) {
gulp.task('browserify', function() {
browserify(config.app.entry, {debug: true})
.add(require.resolve('6to5/polyfill'))
.transform(to5)
.transform(reactify)
.bundle()
.pipe(source(config.app.bundleName))
.pipe(gulp.dest(config.app.bundle));
});
};
My Object is valid, but assign is undefined. What am I doing wrong?

Answer 1

Babeljs (formerly 6to5) does not transform or polyfill Object.assign.
You will need to use another polyfill library. 2 popular libraries are core-js or object-assign.
With core-js you would do it like this:
require('core-js');
Object.assign({}, {a:1});
or
var core = require('core-js/library');
var result = core.Object.assign({}, {a:1});
With object-assign:
var _assign = require('object-assign');
var result = _assign({}, {a:1});
But there are of course a lot of other libraries which do the same.