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I wrote a library - iter-ops, and distributed it as a regular ES2015 module, plus pre-built minified version. But frameworks like Angular complain about ESM-compliance.
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Civic Auth
Auth in Less Than 5 Minutes. Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
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TSUP is good for bundling https://github.com/egoist/tsup
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Specifically for Angular, we have the Angular Package Format, which is produced by the CLI or by the standalone ng-packagr tool.
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webpack
A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.