IIFE globalName does not support namespacing via '.'

[ggoodman]

When using a namespced globalName invalid javascript is emitted:

esbuild --globalName=A.B --format=iife

Produces the following invalid JavaScript:

var A.B = (() => {
 // ...
})();

The use-case for something like this is supporting suites of related libraries exporting their own exports within a partitioned, common namespace.

I've hacked around this for the time being with:

esbuild --globalName="A = A || {}; A.B" --format=iife

[evanw]

Just did a quick survey of other tools. It looks like Rollup is the only tool that supports this. Parcel exports to this["A.B"] instead and Webpack crashes in the minifier with invalid JavaScript.

Parcel's behavior seems the most correct to me. I also found this issue where someone is having problems with the way Rollup does it: rollup/rollup#1473. I'll have to think about what to do here.

[ggoodman]

It would be neat if the ultimate solution continued to have an escape hatch so that this behaviour remains possible.

[KnisterPeter]

Webpack does this with something like this config options:

      webpackConfig.output.library = ['A', 'B'];
      webpackConfig.output.libraryTarget = 'umd';

[ggoodman]

🙇 amazing!