v5.0.0-alpha.0

[markerikson]

This alpha release updates Reselect's build tooling, and updates the packaging for proper ESM compability.

This accompanies the Redux Toolkit 2.0 alphas, currently in progress.

npm i reselect@alpha

yarn add reselect@alpha

Changelog

ESM/CJS Package Compatibility

The biggest theme of the Redux v5 and RTK 2.0 releases is trying to get "true" ESM package publishing compatibility in place, while still supporting CJS in the published package.

Earlier RTK alphas made changes to the package.json contents and published build artifacts in an attempt to get ESM+CJS compat working correctly, but those alphas had several varying compat issues.

We've set up a battery of example applications in the RTK repo that use a variety of build tools (currently CRA4, CRA5, Next 13, and Vite, Node CJS mode, and Node ESM mode), to verify that Redux and Redux Toolkit compile, import, and run correctly with both TS and various bundlers. We've also set up a check using a custom CLI wrapper around https://arethetypeswrong.github.io to check for potential packaging incompatibilities.

This release changes the names and contents of the published build artifacts, and the various exports/module/main fields in package.json to point to those.

The primary build artifact is now an ESM file, dist/reselect.mjs. Most build tools should pick this up. There's also a CJS artifact as well.

As of this release, we think we have ESM+CJS compat working correctly, but we ask that the community try out the alphas in your apps and let us know of any compat problems!

Note: The one known potential issue is that TypeScript's new moduleResolution: "node16" mode may see a mismatch between the ESM artifacts and the TS typedefs when imported in a Node CJS environment, and [that may allow hypothetically-incorrect import usage. (See ongoing discussion in https://github.com/arethetypeswrong/arethetypeswrong.github.io/issues/21 .) In practice, we think that probably won't be a concern, and we'll do further investigation before a final release.

What's Changed

• Upgrade all build tooling for v5 alpha by @markerikson in Upgrade all build tooling for v5 alpha #603
• Tweak CI setup to add CodeSandbox CI and fix Yarn deps by @markerikson in Tweak CI setup to add CodeSandbox CI and fix Yarn deps #607

Full Changelog: v4.1.8...v5.0.0-alpha.0

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This discussion was created from the release v5.0.0-alpha.0.