Enhancing the TypeScript typings of modules in Angular 2

In my Angular2 application, I am facing an issue with an external NPM package that has an outdated typings file. This means there are functions within the package that are present but not declared in the typings file.

My main goals are:

  1. To create and utilize my own typings file that is recognized by Angular2
  2. To extend an existing interface typing with additional members
  3. To properly write the typing in the correct syntax

Despite searching online, I have been unable to find answers to these three questions. I attempted to create a .d.ts file, but I am unsure of how to make Angular2 recognize it and also unclear on the correct syntax to use.

declare namespace ContentfulClientAPI {
    export interface ContentfulClientApi {
        parseEntries(data: any): any;
    }
}

Specifically, I am looking to extend the ContenfulClientAPI as defined here:

angulartypescripttypescript-typings

Answer №1

After successfully getting my code to work in the editor, I encountered an issue when running 'ng build' as angular-cli was unable to find the new function. It turns out that angular-cli only recognizes typings defined in the './src/typings.d.ts' file. If you are using angular-cli, make sure to add the path to it in the 'typeRoots' property and include the typings in that file.

  1. To ensure that both the editor and compiler recognize .d.ts files, modify the "typeRoots" property in the 'tsconfig.json' file. This property specifies where the compiler (and editor) should search for typings. By default, it only looks in "node_modules/@types", but you can add additional locations such as "./typings".
  2. In the newly specified location, create a new typings file named 'contentful.d.ts' and define the typing inside it. Refer to resources like https://www.typescriptlang.org/docs/handbook/declaration-files/templates.html for correct syntax guidance.

My final typings file resembles the following:

import * as contentful from 'contentful';

declare module 'contentful' {
    export interface ContentfulClientApi {
        parseEntries(data: any): any;
    }
}

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