IE11 compatibility

It seems the IE11 compatibility is broken with 5.0.10-beta .

I use webpack to bundle my app and, looking at your rollup config, I think it’s probably because webpack use the lib package.json module field when possible.

https://github.com/krisk/Fuse/blob/aa636e62ac2572c879d1fdf4e1d3e50cfc450da7/package.json#L9

If I understand correctly your rollup config, it outputs ES6 (both ES6 modules and other ES6 features) for the esm bundle. https://github.com/krisk/Fuse/blob/aa636e62ac2572c879d1fdf4e1d3e50cfc450da7/scripts/configs.js#L61-L66

Should not the esm bundle be ES5 with ES6 module import/export for tree shaking like explained for example here?

Something like this for the tsconfig.json

{
  "compilerOptions": {
    "module": "es6",
    "target": "es5",
...

Let me know if I can help with a PR 😃

[guillaumewuip]

#381 should fix this

[slorber]

agree, this is still a problem to me and not sure which version > 5.x I can use with a fix for IE11 / Edge 18.

Afaik the only solution is to ask webpack’s babel loader to transpile this lib