Generate an ESM bundle

[hmaurer]

Hello! Would you be open to a pull request adding an ESM bundle? This would require roughly two changes:

1. add a build script build:esm, building the project using a slightly modified tsconfig.json and outputting to dist/esm (or similar).
2. add a module field to package.json pointing to dist/esm/index.js.

If you are keen I am happy to PR :)

Thanks for the library!

[colinhacks]

Sure I'm down - looking forward to the PR 🤙

[colinhacks]

ESM modules are now available in zod@2.0.0-beta.20+. Big thanks to @cbenz for the PR!

[colinhacks]

Hm the ESM module is breaking things #215

It seems to be related to some tricky circular dependency issues that are doing to take some time to figure out, so I'm removing the ESM module in zod@2.0.0-beta.21. You can stay on zod@2.0.0-beta.20 if you need the ESM module but I suspect it won't actually work at runtime due to the issues described in #215.

@cbenz Can you try building your project and running the bundled version? It appears these issues often don't exist in a development environment then crop up in built/bundled versions.

[cbenz]

Actually the Snowpack dev tool I use, heavily focused on ESModules, has been upgraded in the last couple of days to enhance support of CommonJS modules, so I can now use zod without those native ESModules. Of course in the end ESModules should preferably be shipped for the browser platform rather than CommonJS, but in the meanwhile I'm not blocked anymore, so no problem for me if you remove them.

[colinhacks]

Re-opening because the ES module was removed again in zod@2.0.0-beta.21.

[matmeylan]

We seem to have an error related to this (and to #215).

Currently experiencing this runtime error:

TypeError: Object prototype may only be an Object or null: undefined

This happens with zod@2.0.0-beta.20, but not zod@2.0.0-beta.21

[colinhacks]

Yeah I took the ESM module out in beta21: #215 (comment)

Gonna revisit the ESM bundling once I have time to debug these issues. 👍

[aaronjensen]

We're kicking off a project using Snowpack, which compiles zod to ESM and has this circular dependency issue.. has anyone managed to work around it for now using Snowpack?

[jacksteamdev]

I've run into the circular dependencies problem with Rollup as well, which makes sense b/c Snowpack is built on top of it.

My use case is mainly for the check method as a type guard, which doesn't throw btw, it just always returns false.