Is tsconfig.json Utilized by Gatsby When Using Typescript?

Many blog posts and the example on Gatsby JS's website demonstrate the use of a tsconfig.json file alongside the gatsby-plugin-typescript for TypeScript support in Gatsby. However, it seems like the tsconfig.json file is not actually utilized for configuration purposes. This raises the question of whether my assumption is correct.

Gatsby utilizes 

@babel/plugin-transform-typescript
to convert TypeScript to JavaScript, with detailed documentation available regarding how this Babel plugin mirrors the options of the tsc TypeScript compiler. According to the docs:

Changes made to your tsconfig.json file do not impact Babel. The build process continues to operate as if isolatedModules is enabled, although there are Babel-native alternatives for setting many of the options typically found in tsconfig.json.

Is there a specific reason why all TypeScript setups for Gatsby include a tsconfig.json file and configuration, despite it seemingly being unused by Gatsby itself?

javascripttypescriptbabeljsgatsbytsconfig

Answer №1

There are multiple compelling reasons for including a tsconfig.json file in a Gatsby project:

  • Testing frameworks such as Jest require explicit guidance on how to handle TypeScript files instead of relying on the internal Gatsby configuration.
  • Code editors like VS Code also encounter similar challenges with TypeScript, necessitating the presence of a configuration file for proper functioning of tools like the TypeScript Server.
  • Linting libraries like ESLint rely on the presence of the tsconfig.json file for correct operation.

An important drawback of using TypeScript with Babel (as in Gatsby) is the lack of type checking, leading to varied error outputs between the Gatsby dev server and other integrated tools such as the "output" tab in VS Code.

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