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Why this exists Node has two module systems that grew up separately, and a project can contain both. This is why the same beginner errors appear again and again: require is not defined, Cannot use import statement…

Node.js Modules in Depth: ES Modules, CommonJS, package.json exports and the Errors Between Them

How Node loads code: named and default exports, import attributes for JSON, subpath imports, import.meta instead of __dirname, top-level await, dynamic import, mixing CommonJS and ES modules in both directions, the package.json exports map, and the exact errors each mistake produces.

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