IE11 Symbol Issue

[xjamundx]

In Internet Explorer 11 I get this error message when using the web components polyfill and lodash omitBy or pickBy.

Unable to get property '@@__symbol:iterator0.93819982581614551' of undefined or null reference

This is not a duplicate of #43, though there are some similarities.

This has occurred with other polyfills as well:

• https://github.com/Financial-Times/polyfill-service/issues/1058
• https://github.com/zloirock/core-js/commit/78770786a4e5f2f87ea32b4dada46b9ce0a92887

Lodash similarly has blocked the issue on their end, I believe thinking that polyfills need to resolve the issue: https://github.com/lodash/lodash/issues/2308

Some interesting things about reproduction:

---

This one will fail with the above error:

<script src="https://unpkg.com/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
<script>
var obj = {a: 1, b: 2}
var smaller = _.omitBy(obj, function (val) { return val > 1 })
console.log(smaller)
</script>

---

This one works fine:

<script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/2.4.3/custom-elements-es5-adapter.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
<script>
var obj = {a: 1, b: 2}
var smaller = _.omitBy(obj, function (val) { return val > 1 })
console.log(smaller)
</script>

---

Does that just mean I'm using the wrong polyfill? My real use case is a complex webpack bundle thing with core-js and other, we first ran into #43 now this :)

---

---

You can see it for yourself here: https://jsfiddle.net/s8yzcjne/3/embedded/result,css,html,js

[xjamundx]

A workaround that works if you have webpack is to alias lodash.pickBy to a local module that exports its own pickBy method.

function pickBy(obj, pickFn) {
    return Object.fromEntries(
        Object.entries(obj).filter(([, value]) => {
            return pickFn(value);
        })
    );
}

export default pickBy;
export { pickBy };

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed after being marked stale. If you're still facing this problem with the above solution, please comment and we'll reopen!