New —resolveJsonModule

Often in Node.js applications a .json is needed. With TypeScript 2.9, —resolveJsonModule allows for importing, extracting types from and generating .json files.

Example

// settings.json
{
    "repo": "TypeScript",
    "dry": false,
    "debug": false
}

// a.ts
import settings from "./settings.json";
settings.debug === true;  // OK
settings.dry === 2;  // Error: Operator '===' cannot be applied boolean and number

// tsconfig.json
{
    "compilerOptions": {
        "module": "commonjs",
        "resolveJsonModule": true,
        "esModuleInterop": true
    }
}