What is the issue with importing node-fetch when using ES modules that is not supported?

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When using ES modules, importing node-fetch module may result in an error because node-fetch is not an ES module and is not supported by the ES module system. This is because node-fetch is implemented using CommonJS module syntax and not native ES module syntax. Therefore, it cannot be imported directly in an ES module. To use node-fetch in an ES module, developers need to use a bundler like webpack or rollup that can handle CommonJS modules and convert them to ES modules.