Setting up in the namespace for typescript

Is there a way to assign to namespaces using dot notation like this?

namespace item {}

item.item1 = {
  name: "Some Item"
}

item.item2 = {
  name: "Some Item"
}

An error is thrown with:

Property 'item1' does not exist on type 'typeof item'.

An alternative approach that works involves:

  namespace item {
    export const item3 = {
      name: "Some Item"
    }
  }
  namespace item {
    export const item4 = {
      name: "Some Item"
    }
  }

However, this solution is verbose and unattractive. Is there a way to make the initial version work by modifying the namespace declaration? For example:

namespace item {
  [key: string]: ItemType
}

My goals are:

  • To have intellisense autocomplete for item., displaying item1, item2, etc.
  • To organize items in separate files instead of all within the same bracket.

Answer №1

Variable keys are not designed to be used with namespaces.

If you wish to establish a namespace and assign values later on, follow this example:

namespace A {
  export declare let n: number;
}
A.n = 123;

To export multiple items within a namespace, try this approach:

namespace A {
  export const item1: ItemType = {name: '123'};
  export const item2: ItemType = {name: '123'};
}

If you need an object with unspecified properties, consider using:

let A: Record<string, ItemType> = {}
A.whatever = {name: '123'}

// or Partial<Record<'a'|'b', ItemType>>
let B: {[K in 'a'|'b']:?: ItemType} = {}
B.a = {name: '123'}

Namespaces essentially act as shorthand for the following:

A = ((A) => {
   A.item1 = {name: 123};
   A.item2 = {name: 123};
   return A;
})(A ?? {})


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