Understanding TypeScript 4.7 and ECMAScript module support

With the release of TypeScript 4.7, a significant update has been introduced to support ECMAScript modules in Node.js, enhancing the capability to author modules using TypeScript with the new ECMAScript module semantics. This update addresses the long-standing challenge of integrating ECMAScript modules in the backend, which was traditionally dominated by the CommonJS module system. The post demonstrates how to create a simple module using TypeScript 4.7, detailing the setup process, including configuring the package.json and tsconfig.json files for ECMAScript module compliance. It explores the syntax changes required for importing modules and highlights the interoperability between ECMAScript and CommonJS modules by showcasing how TypeScript transpiles these modules into JavaScript. Additionally, the post underscores the importance of understanding the emitted files and the differences in their JavaScript outputs, emphasizing the new possibilities for module authors in the Node.js ecosystem.