Executing an individual .ts file within a Next.js application using ts-node for the purpose of testing

I'm attempting to execute a single ES module .ts file within a Next.js project using the default configuration for quick debugging:

npx ts-node lib/my_module.ts

However, I encounter the following error:

Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.

Since I prefer not to modify the default configuration, I am seeking a practical solution to resolve this issue.

Answer №1

There is actually a specific section in the ts-node configuration that we can include in our tsconfig.json.

This addition will not disrupt the Next.js compiler options.

  ...
  "ts-node": {
    "compilerOptions": {
      "module": "CommonJS"
    }
  },
  ...

For more information, refer to https://github.com/TypeStrong/ts-node/issues/935#issuecomment-913179458.

Once this is done, you can easily execute a file with ts-node lib/my_module.ts.

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