Is Object.groupBy working?

[Semigradsky]

Looks like Object.groupBy doesn't work with babel.

My configuration:

@babel/preset-env: 7.22.20
@babel/compat-data: 7.22.20
core-js-compat: 3.31.0

Babel config:

    [
      '@babel/preset-env',
      {
        useBuiltIns: 'usage',
        corejs: 3.32,
        bugfixes: true,
        shippedProposals: true,
      },
    ],

The code console.log(Object.groupBy({}, ({ foo }) => foo)) fails

https://github.com/tc39/proposal-array-grouping on Stage 3

[zloirock]

console.log(Object.groupBy({}, ({ foo }) => foo)) fails because you pass a non-iterable object.

Works something like that:

console.log(Object.groupBy([{ foo: 1 }, { foo: 2 }], ({ foo }) => foo)); // => { 1: [{ foo: 1 }], 2: [{ foo: 2 }] }

[zloirock]

If it will not work for you, ping Babel team in the https://github.com/babel/babel-polyfills repo since theoretically the current published babel-plugin-polyfill-corejs3 package version could use obsolete data and does not know that Object.groupBy is shipped.

Or just pass proposals: true.

[Semigradsky]

As I see groupBy exists in polyfill-corejs3:
https://github.com/babel/babel-polyfills/blob/8999c65c946789931fd68de3be45775dff0df334/packages/babel-plugin-polyfill-corejs3/src/shipped-proposals.ts#L27

Could you advise where I can found code for detection that need to add polyfill? For debugging it

[zloirock]

@Semigradsky as I wrote above, it seems the latest published version of babel-plugin-polyfill-corejs3 is 0.8.3 - it's July and Object.groupBy still was not shipped.

https://github.com/babel/babel-polyfills/blob/babel-plugin-polyfill-corejs3%400.8.3/packages/babel-plugin-polyfill-corejs3/src/shipped-proposals.ts

I pushed changes with this after that, but it seems the new version of the package is still not published.

@nicolo-ribaudo it seems need to do it.

[Semigradsky]

Oh, I see. Thank you