These releases add more than just Node.js ESM support. Node.js supports two new file extensions for modules always of ESM or CJS.
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Relative import paths with ESM need full file extensions in the path, and various techniques used by CommonJS modules are not supported such as top-level require and module. ESM supports key features include import/export statements and top-level async/await. js files are interpreted as ESM or CommonJS modules. Through the use of package.json's "type": "module", Node.js determines whether. TypeScript 4.7 adds two new module settings: node16 and nodenext. Interoperating between the two brings large challenges, with many new features to juggle. This has been a very difficult feature, since the Node.js ecosystem is built on a different module system called CommonJS (CJS). The TypeScript 4.7 release helps get us closer to a world where all JavaScript is authored and used as ESM.ĭaniel Rosenwasser, TypeScript Program Manager, explains:įor the last few years, Node.js has been working to support ECMAScript modules (ESM).
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Early usage was primarily limited to authoring, with build tools such as Webpack and transpilers such as TypeScript converting code to modules that would run in various environments.Īs the module format has improved over the past few years, browsers natively support ESM loading and Node.js 16 now does as well.
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Since ES6 introduced modules in 2015, work has been underway to move the JavaScript and TypeScript ecosystems to the native module format.
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The TypeScript team announced the release of TypeScript 4.8 beta and TypeScript 4.7, which introduces ES Module (ESM) support for Node.js, improved type inference and control flow analysis, and significant performance improvements.