typescript/no-namespace Restriction
What it does
Disallow TypeScript namespaces.
Why is this bad?
TypeScript historically allowed a form of code organization called "custom modules" (module Example {}), later renamed to "namespaces" (namespace Example). Namespaces are an outdated way to organize TypeScript code. ES2015 module syntax is now preferred (import/export).
Example
typescript
module foo {}
namespace foo {}
declare module foo {}
declare namespace foo {}