Perform TypeScript type checks exclusively on a Next.js project

In my current project using Next.js with TypeScript in a mono-repo setup, I have multiple applications under the same repository. When pushing changes to this setup, various hooks are triggered locally to ensure that the modifications meet the required standards - passing tests and successful builds.

Despite these validations, the build process for our application is time-consuming, and any errors tend to occur early on in the process.

For building a specific application, I use nx build my-application, which involves steps such as:

  • Checking type validity
  • Generating an optimized production build
  • Gathering page data
  • ...

If there is an issue, the initial step of checking types (performed by TypeScript) typically fails quickly (<15 seconds), prompting me to consider running this step independently.

Therefore, my query is: Is it possible to only run the first step to validate types without proceeding through the entire build process? Despite reviewing the build command in the Next.js documentation, I couldn't find a direct solution.

Answer №1

A key feature of Next.js projects with TypeScript is the ability to use the tsc command for type checking before building.

tsc serves as the TypeScript compiler's command-line tool, ensuring that TS files are free from syntax and type errors. By running tsc in the terminal at the project root where your tsconfig.json file resides, you can verify TypeScript types.

Although the tsc command can be used directly in the terminal, it's beneficial to streamline this process by setting up a script in your package.json. Here's a simple guide on how to do so:

  1. Open your package.json file.
  2. Locate the "scripts" section.
  3. Add a new script named "type-check" that executes tsc.
  4. Save the changes.

Your updated package.json might resemble the following structure:

{
  "name": "your-next-js-app",
  "version": "1.0.0",
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "type-check": "tsc"
  },

By executing npm run type-check in your terminal, you can efficiently validate TypeScript types before initiating a build.

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