Readonly Properties

Snippet

The 'readonly' modifier makes a property immutable after the object is first initialized, preventing accidental changes to sensitive data.

snippet.ts
typescript
type Config = {
  readonly apiKey: string;
  version: number;
};
 
const myConfig: Config = { apiKey: "XYZ", version: 1 };

Breakdown

readonly apiKey: string;

Marks the property as read-only; it cannot be reassigned after object creation.

version: number;

A standard property that remains mutable.

From your library