Upgrade to babel beta 56

[TrySound]

Babel runtime was split with @babel/runtime and @babel/runtime-corejs2
pacakges which allows to omit large core-js pacakge in many cases. Babel
runtime with only helpers became a default so users could include
necessary polyfills by themselves.

[alexreardon]

What polyfills would be required? I think it worthwhile having a page in docs/ to explain this

…

On Mon, 6 Aug 2018 at 8:15 am, Bogdan Chadkin ***@***.***> wrote: Babel runtime was split with @babel/runtime and @babel/runtime-corejs2 pacakges which allows to omit large core-js pacakge in many cases. Babel runtime with only helpers became a default so users could include necessary polyfills by themselves. ------------------------------ You can view, comment on, or merge this pull request online at: #687 Commit Summary - Upgrade to babel beta 56 File Changes - *M* .size-snapshot.json <https://github.com/atlassian/react-beautiful-dnd/pull/687/files#diff-0> (12) - *M* package.json <https://github.com/atlassian/react-beautiful-dnd/pull/687/files#diff-1> (20) - *M* rollup.config.js <https://github.com/atlassian/react-beautiful-dnd/pull/687/files#diff-2> (2) - *M* yarn.lock <https://github.com/atlassian/react-beautiful-dnd/pull/687/files#diff-3> (1017) Patch Links: - https://github.com/atlassian/react-beautiful-dnd/pull/687.patch - https://github.com/atlassian/react-beautiful-dnd/pull/687.diff — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#687>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACFN7aaAzsaO9_DXADgUyCMp8xbX_kWRks5uN26LgaJpZM4VvjrQ> .

[TrySound]

Currently I left as it is. Babel adds core-js Object.assign and Object.keys polyfills + helper versions with polyfills for es3. So bundle size is mostly increased unnecessary.

[TrySound]

Here's the diff after removing core-js

 {
   "dist/react-beautiful-dnd.js": {
-    "bundled": 351336,
-    "minified": 131838,
-    "gzipped": 37030
+    "bundled": 346633,
+    "minified": 126400,
+    "gzipped": 35020
   },
   "dist/react-beautiful-dnd.min.js": {
-    "bundled": 311485,
-    "minified": 114193,
-    "gzipped": 31352
+    "bundled": 305938,
+    "minified": 108748,
+    "gzipped": 29298
   },
   "dist/react-beautiful-dnd.esm.js": {
-    "bundled": 180986,
-    "minified": 93116,
-    "gzipped": 23145,
+    "bundled": 180804,
+    "minified": 92948,
+    "gzipped": 23104,
     "treeshaked": {
       "rollup": {
-        "code": 68441,
-        "import_statements": 700
+        "code": 68400,
+        "import_statements": 566
       },
       "webpack": {
-        "code": 70717
+        "code": 70575
       }
     }
   }

[alexreardon]

Do you think it worth dropping core-js? Given it is only a small saving I think we could keep it for now. Thoughts?

[TrySound]

Sure, it's not too much.