Using NextJS to execute a Typescript script on the server

Question

Using NextJS to execute a Typescript script on the server

I am working on a NextJS/Typescript project where I need to implement a CLI script for processing files on the server.

However, I am facing difficulties in getting the script to run successfully.

Here is an example of the script src/cli.ts:

console.log("Hello world");
// Process files

I attempted to execute the script using the following command:

ts-node src/cli.ts

But I encountered this error message:

src/cli.ts:1:1 - error TS1208: 'cli.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement to make it a module.

Upon adding an empty 'export {}' statement, I received the following warning:

(node:15923) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.

It appears that using ES modules with NextJS is currently not supported.

Is there an alternative approach to running the script within a NextJS project? Perhaps modifying the webpack configuration could help?

My setup includes the latest versions: Next 11, Typescript 4.3, Node 14.18, ts-node 10.13 with the default tsconfig.json, package.json.

typescript next.js ts-node

Answer 1

Answer №1

If you're looking to integrate seamlessly with NextJS, consider using TSX instead. This tool supports both JavaScript and TypeScript without the need for any additional setup.

Get started by adding it to your project:

yarn add -D tsx

Next, declare your script in the package.json file:

...
"scripts": {
  ...
  "my-custom-script": "tsx src/custom.tsx"
},

Finally, run your custom script with the following command:

yarn my-custom-script

Answer 2

If you're looking to integrate seamlessly with NextJS, consider using TSX instead. This tool supports both JavaScript and TypeScript without the need for any additional setup.

Get started by adding it to your project:

yarn add -D tsx

Next, declare your script in the package.json file:

...
"scripts": {
  ...
  "my-custom-script": "tsx src/custom.tsx"
},

Finally, run your custom script with the following command:

yarn my-custom-script

Answer 3

Answer №2

Instead of the original command, consider running the following:

npx ts-node --skip-project src/cli.ts

To learn more about this method, visit: https://github.com/TypeStrong/ts-node#tsconfig

By using the --skip-project flag in your command, you can bypass loading the tsconfig.json, thus avoiding conflicts with

"isolatedModules": true

required by Next.js.

If needed, you can create a separate tsconfig file specifically for ts-node and utilize the --project [path] option.

An alternative approach is to customize configuration for ts-node within your existing tsconfig.json as demonstrated below:

{
  "extends": "ts-node/next/tsconfig.json",

  "ts-node": {
    "compilerOptions": {
      // By setting specific compiler options here, they will take precedence over global settings,
      // exclusively for ts-node. This is beneficial when requiring distinct options for ts-node versus tsc
      // while maintaining a single tsconfig.json.

      "isolatedModules": false
    }
  },

  "compilerOptions": {
    // Define TypeScript options here
  }
}

For further details on this approach, refer to: https://github.com/TypeStrong/ts-node#via-tsconfigjson-recommended

Answer 4

Instead of the original command, consider running the following:

npx ts-node --skip-project src/cli.ts

To learn more about this method, visit: https://github.com/TypeStrong/ts-node#tsconfig

By using the --skip-project flag in your command, you can bypass loading the tsconfig.json, thus avoiding conflicts with

"isolatedModules": true

required by Next.js.

If needed, you can create a separate tsconfig file specifically for ts-node and utilize the --project [path] option.

An alternative approach is to customize configuration for ts-node within your existing tsconfig.json as demonstrated below:

{
  "extends": "ts-node/next/tsconfig.json",

  "ts-node": {
    "compilerOptions": {
      // By setting specific compiler options here, they will take precedence over global settings,
      // exclusively for ts-node. This is beneficial when requiring distinct options for ts-node versus tsc
      // while maintaining a single tsconfig.json.

      "isolatedModules": false
    }
  },

  "compilerOptions": {
    // Define TypeScript options here
  }
}

For further details on this approach, refer to: https://github.com/TypeStrong/ts-node#via-tsconfigjson-recommended

Answer 5

Answer №3

Expanding on the response provided by @brc-dd.

The use of --skip-project has been replaced with --skipProject

To configure the new TSConfig for executing the script, include the following setup:

{
  "extends": "ts-node/next/tsconfig.json",

  "ts-node": {
    "compilerOptions": {
      // compilerOptions outlined here take precedence over those defined below,
      // specifically within ts-node scope. This allows customization between
      // ts-node and tsc using a single tsconfig.json.

      "module": "CommonJS",
      "isolatedModules": false
    }
  },

  "compilerOptions": {
    // additional TypeScript options can be specified here
  }
}

The only modification introduced is:

"module": "CommonJS",

Answer 6

Expanding on the response provided by @brc-dd.

The use of --skip-project has been replaced with --skipProject

To configure the new TSConfig for executing the script, include the following setup:

{
  "extends": "ts-node/next/tsconfig.json",

  "ts-node": {
    "compilerOptions": {
      // compilerOptions outlined here take precedence over those defined below,
      // specifically within ts-node scope. This allows customization between
      // ts-node and tsc using a single tsconfig.json.

      "module": "CommonJS",
      "isolatedModules": false
    }
  },

  "compilerOptions": {
    // additional TypeScript options can be specified here
  }
}

The only modification introduced is:

"module": "CommonJS",

Using NextJS to execute a Typescript script on the server

Answer №1

Answer №2

Answer №3

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