feat: Add "worker" export in package.json

[desjoerd]

To support setting the environment in esbuild to "worker" when building for cloudflare it cannot match the worker exports. Adding the "worker" export would resolve this.

Adding a "worker" export type is logical as the cloudflare environment has the same capabilities as a "worker like webworker serviceworker.

[desjoerd]

Some background for this PR, I am using this package with Remix run and want to deploy it to cloudflare. When building remix run it resolves all packages by searching for the "worker" export. I think it's a good convention especially when considering that cloudflare has (almost) the same api and capabilities as a serviceworker.

Please let me know what you think, and whether I need to update/change something :).

[panva]

@desjoerd thank you, can you point me to the documentation for this build target?

[desjoerd]

Wow, quick response 👍 . I dived a little bit more into the documentation of esbuild, they didn't mention platform "worker" explicitly. Found some references from this issue: evanw/esbuild#1189 (comment)

Looks like webpack has support for it as defined here: https://webpack.js.org/guides/package-exports/#target-environment and I think remix run (where I want to use this library ;)) mimics this when setting the environment to cloudflare-workers.