Ambient Context

By default, the TypeScript compiler does not know in which runtime environment (for instance Node.js v16, Electron v16, Chrome v94) our code will be executed later. That’s why we can help the compiler knowing that by defining an ambience / ambient context.

Example:

If you run your code in an environment where there is a “world” object that TypeScript does not know about, you can define that context using declare var:

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declare var world: {
  name: string;
};

console.log(world.name);