fix(pkg): make the package importable from ESM and CommonJS

[AmrendraTheCoder]

Fixes #234.

Please treat this as a proposal rather than a claim on the issue. I said in #234 that I would wait for a steer before sending code, and I have put the branch up anyway, which I want to be upfront about. Two of my three questions turned out to be answerable by measuring, so showing the diff seemed more useful than describing it. The third is still yours to call. Happy to close or reshape this if you would rather go another way.

The problem

package.json declares "type": "module", so every .js file in src/ is treated as an ES module. The only export machinery in src/social-share-button.js is this, at the bottom:

if (typeof module !== "undefined" && module.exports) {
  module.exports = SocialShareButton;
}

In an ES module module is undefined, so that block never runs. There is no export statement in the file either, so the module ends up with zero exports. Only the window.SocialShareButton assignment survives, which is exactly why the CDN path works and npm does not. src/social-share-analytics.js has the same latent problem.

Why the fix is not the obvious one

My first instinct was to add export default SocialShareButton; to the core file. That would have broken the CDN for everyone, and I only caught it because I compiled the file the way a classic <script> does before committing to the approach:

current v1.0.4 core                  : parses as a classic <script>  OK
core + "export default" (my instinct): FAILS as a classic <script>
                                       SyntaxError: Unexpected token 'export'

export is only legal inside a module, and the README serves that exact file through <script src="https://cdn.jsdelivr.net/gh/..."> on ten or so lines. So the core files have to stay free of export syntax.

The useful part is that they already are. Neither core file contains any import or export syntax, which means both are already valid CommonJS and the root "type": "module" is simply mislabelling them. So this tells Node the truth rather than rewriting the files:

1. src/package.json with { "type": "commonjs" }. Nested package.json type scoping is standard Node, and it turns the existing module.exports blocks back into live code. Browsers never read package.json, so the CDN is untouched.
2. src/social-share-button.mjs and src/social-share-analytics.mjs, small ESM entry points that re-export from the CommonJS files.
3. An exports map wiring the import and require conditions, plus named subpaths.
4. The files array now ships the Preact and Qwik wrappers, which were listed nowhere and so were never published.

No library logic changed. Both core .js files are byte identical to main.

Nothing that worked before stops working

An exports map normally cuts off deep imports, and the README documents import "@aossie-org/social-share-button/src/social-share-button.css". I kept "./src/*": "./src/*" specifically so that path and every other documented one keeps resolving. The tradeoff is that this gives up most of the encapsulation an exports map would normally buy you. If you would rather make the clean break, that is a one line deletion plus a README update and I am glad to do it.

Verification

Run against a real npm pack plus install, Node v22.21.0, no bundler unless stated.

Before, on published 1.0.4:

import S from '...'        SyntaxError: does not provide an export named 'default'
import * as ns from '...'  namespace keys: []
require('...')             [Module: null prototype] {}   no class

After:

ESM default import    : function SocialShareButton
ESM named import      : function SocialShareButton
CJS require           : function SocialShareButton
./analytics, both     : 7 exports, the 6 adapters plus the base class
old deep css path     : resolves, README unbroken
new ./css subpath     : resolves

Check	Result
classic <script> tag in a browser	loads, window.SocialShareButton is a function, buttons render, no console errors
esbuild, main entry and /react and /preact	bundles
Rollup with node-resolve and commonjs	bundles and runs
exports-blind legacy resolution via main	resolves to the class
every exports target cross checked against the packed tarball	all present
npm run lint, npm run format:check	pass

I have only tested Node v22.21.0. The features used here, nested type scoping and exports maps, are old and widely supported, but I would rather say what I actually ran than imply a matrix I did not.

The README needs no change, because the snippet it already documents now works as written.

Notes and open questions

• CJS without a build step. This uses the CommonJS the repo already had, so there is no dist/ and no toolchain. If you would prefer a real build step, that is a bigger change and I did not want to introduce one uninvited. This is the question I could not answer by measuring.
• The version is not bumped. Nothing reaches consumers until a release, which I assumed you would rather own.
• The two new .mjs files are not covered by CI. The lint glob is src/**/*.{js,jsx} and Prettier's is similar. I left both scripts alone because the CI standard is synced from Template-Repo and did not seem like mine to widen. I ran eslint and Prettier against the new files directly and both are clean. Say the word if you want the globs widened to include mjs.
• The wrappers still read the class off the global. /react, /preact and /qwik are now real subpaths but none of them import the core, and there are no peerDependencies declared. That is pre-existing and unchanged, but shipping the files is what makes it reachable, so it is worth knowing.
• New subpaths are undocumented. /analytics, /css, /react, /preact, /qwik all work now and none are in the README. Happy to write that up here or separately, whichever you prefer.

On #233

No types field here, deliberately. That belongs with #233, which is @Mansi2007275's and which they said they want to write themselves. Two of the entries here are already condition objects that a types key drops straight into; the four plain string subpaths would each need converting to an object first, which is mechanical. I am not asking for that issue and this does not block it.

---

Used Claude as a research assistant while digging into this. The diagnosis, the classic script check that changed the approach, and every measurement above are mine, run locally against a packed build of this branch.

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• src/social-share-analytics.mjs

Walkthrough

The package now defines explicit CommonJS and ESM entry points, conditional subpath exports, and an expanded published file list. New ESM entry points expose SocialShareButton and analytics adapters as default and named exports.

Changes

Package exports

Layer / File(s)	Summary
Package resolution and published artifacts package.json, src/package.json	Package metadata defines CommonJS and ESM resolution, conditional subpath exports, and commonjs package type. The published file list includes ESM, Preact, Qwik, and analytics artifacts.
ESM entry points src/social-share-button.mjs, src/social-share-analytics.mjs	The share button and analytics adapters are available through default and named ESM exports.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to 7e998

The package’s ESM analytics entry point does not expose the public SocialShareAnalyticsPlugin binding, so consumers using the documented module interface may be unable to import it. Merge should wait for the export and a focused import test.

Possibly related PRs

• AOSSIE-Org/SocialShareButton#213: Adds related package exports and CSS entry-point integration guidance.

Suggested labels: Typescript Lang

Poem

A rabbit found exports neatly aligned,
With ESM paths and adapters defined.
The button now hops through imports with grace,
While Preact and Qwik join the package race.
“No empty modules!” the rabbit proclaimed.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes address issue #234 by adding ESM and CommonJS entry points, exports subpaths, deep-path support, and published framework wrappers.
Out of Scope Changes check	✅ Passed	The changes remain within issue #234 and support its package compatibility and publication requirements.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: enabling package imports from both ESM and CommonJS.

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• Create PR with unit tests

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Actionable comments posted: 1

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Inline comments:
In `@src/social-share-analytics.mjs`:
- Around line 10-17: Update the named exports in the social-share analytics ESM
entry point to include SocialShareAnalyticsPlugin alongside the existing adapter
bindings, and add an ESM import test confirming that this named export is
publicly available.

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• package.json
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• src/social-share-analytics.mjs
• src/social-share-button.mjs

[AmrendraTheCoder]

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[amankv1234]

@CodeRabbit, what inhacement is doning this pr is it needed according to our plane ??

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@amankv1234 Yes. This PR is needed for the package-consumption plan in issue #234.

It fixes the current npm package problem:

• ESM import does not load the library correctly.
• CommonJS require() does not return the library class correctly.
• Framework wrappers for Preact and Qwik are not included in the published package.
• Consumers cannot use stable package subpaths for analytics and CSS.

The PR adds:

• A CommonJS boundary for the existing .js source files.
• .mjs entry points for ESM users.
• An exports map for import, require, CSS, analytics, and framework wrappers.
• Preact and Qwik files to the published package.
• Continued support for the existing CDN script path and src/... deep imports.

This PR does not add TypeScript definitions. That is separate future work from issue #233.

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