TSConfig

Allows importing modules with a .json extension, which is a common practice in node projects. This includes generating a type for the import based on the static JSON shape.

TypeScript does not support resolving JSON files by default:

ts
// @filename: settings.json
{
    "repo": "TypeScript",
    "dry": false,
    "debug": false
}
// @filename: index.ts
import settings from "./settings.json";
Cannot find module './settings.json' or its corresponding type declarations.2307Cannot find module './settings.json' or its corresponding type declarations.
 
settings.debug === true;
settings.dry === 2;Try

Enabling the option allows importing JSON, and validating the types in that JSON file.

ts
// @filename: settings.json
{
    "repo": "TypeScript",
    "dry": false,
    "debug": false
}
// @filename: index.ts
import settings from "./settings.json";
 
settings.debug === true;
settings.dry === 2;
This comparison appears to be unintentional because the types 'boolean' and 'number' have no overlap.2367This comparison appears to be unintentional because the types 'boolean' and 'number' have no overlap.Try