Combining an external class with a namespace in TypeScript

Valid Script Code:

class InputField {
  
}

namespace InputField {
  export enum Types {
    text = "text",
    number = "number"
  }
}

export { InputField };

Invalid Script Code:

import InputField from "@Controls/InputFields/InputField.vue";
// TS2440: Import declaration conflicts with local declaration of 'InputField'

namespace InputField {
  export enum Types {
    text = "text",
    number = "number"
  }
}

export { InputField };

How can I combine the imported InputField class with the namespace InputField and re-export it?

Planned Usage of the Merged Result

import { Vue, Component, Prop } from "vue-property-decorator"
import { InputField } from "@Components/..."


@Component({
  //              Using as namespace    ↓↓↓
  template: `<InputField type="InputField.Types.number" />`,
  components: {
    InputField // Using as Vue component
  } 
})
export default class Application extends Vue {
  // Enabling access from template
  private InputField: typeof InputField = InputField;
}

Motivation Behind the Requirement

declare module "*.vue" {
  import Vue from "vue";
  export default Vue;
}

This is necessary because TypeScript cannot recognize the public fields of imported classes in .vue files.

Answer №1

To get around the issue with

*.vue as VueContructor<Vue>
, you can proxy it through a *.ts file:

import DefaultImportClass, {componentOptions} from "@/source/index.vue"
import {Component} from "vue-property-decorator"

@Component<exportClassName>(componentOptions)
class exportCalssName extends DefaultImportClass {} 
namespace exportClassName {}

export {exportClassName}

HOWEVER

You can achieve the same outcome using static instead of a namespace:

enum Types {
  Text: "text",
  Number: "number"
}

@Component
export class InputFieldTypes extends Vue {
  static Types = Types
}

Answer №2

Restriction

@Component({
  template: `<input type="HTML_Type" />`
})
export default class InputField extends Vue {

  //              This will not be recognized by Vue !! ↓↓   
  @Prop({ default: InputField.Properties.Types.text, type: String }) 
  private readonly HTML_Type!: string;
}

namespace InputField {
  export enum Types {
    text = "text",
    number = "number"
  }
}

The issue could potentially be resolved utilizing static fields.

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