What is the procedure for utilizing custom .d.ts files in an Angular 15 project?

Currently, within my Angular 15 project, I am utilizing a package called bootstrap-italia. This particular package is dependent on the standard Bootstrap package and includes additional custom components and types. However, it should be noted that this package does not come with built-in TypeScript declarations. In an attempt to address this limitation, I created some .d.ts files manually in a typings/bootstrap-italia folder located in the root folder of my project. These files included an index.d.ts file and a plugins folder containing individual .d.ts files for each component type I required. Despite my efforts, I encountered an error during compilation which stated:

Error: Module not found: Error : Can't resolve '../../../../../typings/bootstrap-italia' in 'C:\Users\ivanc\Dev\angular\CitizenPortal\Frontend\src\lib\components\various\notification'
. How can I go about resolving this issue?

typings/bootstrap-italia/index.d.ts:

import Notification from './plugins/notification';

export { Notification };

typings/bootstrap-italia/plugins/base-component.d.ts:

export type GetInstanceFactory<T> = (element: string | Element) => T | null;
export type GetOrCreateInstanceFactory<
  T,
  C extends ComponentOptions = ComponentOptions
> = (element: string | Element, config?: C) => T;
export type ComponentOptions = Record<string, any>;

export default class BaseComponent {
  static readonly VERSION: string;

  static readonly DATA_KEY: string;

  static readonly EVENT_KEY: string;

  constructor(element: string | Element);

  dispose(): void;
}

typings/bootstrap-italia/plugins/notification.d.ts:

import BaseComponent, { GetOrCreateInstanceFactory } from './base-component';

declare class Notification extends BaseComponent {
  static getOrCreateInstance: GetOrCreateInstanceFactory<
    Notification,
    Partial<Notification.Options>
  >;

  static Default: Notification.Options;

  constructor(
    element: string | Element,
    options?: Partial<Notification.Options>
  );

  toggle(relatedTarget?: HTMLElement): void;

  show(timeout?: number, relatedTarget?: HTMLElement): void;

  hide(): void;
}

declare namespace Notification {
  enum Events {
    show = 'show.bs.modal',
    hidden = 'hidden.bs.modal',
  }

  interface Options {
    timeout: number;
  }

  interface Event extends CustomEvent {
    target: HTMLElement;
    relatedTarget?: HTMLElement;
  }
}

export default Notification;

To integrate these definitions into Angular components .ts file, I have added the following import statement:

import { Notification } from '../../../../../typings/bootstrap-italia';

Answer №1

To solve the problem, I fixed it by deleting the ".d" from the file extension.

The ".d" extension is supposed to indicate to Typescript that it's a decoration file, which doesn't need to be imported. However, for reasons unknown, it wasn't functioning properly. By removing the ".d", the file will be treated as normal and function correctly. Additionally, this issue only arises under certain circumstances, such as when trying to use an enum type in a component-level variable.

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