IE11 compatibility

[guillaumewuip]

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.

Fuse/package.json

Line 9 in aa636e6

"module": "./dist/fuse.esm.js",

If I understand correctly your rollup config, it outputs ES6 (both ES6 modules and other ES6 features) for the esm bundle.

Fuse/scripts/configs.js

Lines 61 to 66 in aa636e6

	'esm': {
	entry: resolve('src/index.js'),
	dest: resolve(`dist/${FILENAME}.esm.js`),
	format: 'es',
	env: 'development',
	transpile: false,

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 :)

[krisk]

Want to create a PR for this?

[guillaumewuip]

Yes 👍

[guillaumewuip]

Looking further on the IE11 crash error, we see this

This seems to be the babel result of this line

Fuse/src/search/bitap-search/bitap-score.js

Line 3 in e5d4c1c

{ errors = 0, currentLocation = 0, expectedLocation = 0, distance = 100 }

To be IE11 compatible, we should not have object spreading here. It's looks like babel is not removing those.

[guillaumewuip]

#381 should fix this

[evanmoses-okta]

This should still be open until #383 is merged.

[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