Utilizing a d.ts Typescript Definition file for enhanced javascript intellisene within projects not using Typescript

I am currently working on a TypeScript project where I have set "declaration": true in tsconfig.json to generate a d.ts file. The generated d.ts file looks like this:

/// <reference types="jquery" />
declare class KatApp implements IKatApp {
    selector: string;
    private static applications;
    static remove(item: KatApp): void;
    static get(key: string | number | Element): KatApp | undefined;

// removed rest for brevity

I attempted to follow the instructions outlined in IntelliSense based on TypeScript declaration files to enable IntelliSense in a non-TypeScript project (specifically a web forms project).

On one of my pages, I have the following code snippet:

<script>
    (function () {
        /**
         * @type {KatApp}
        */
        var application = KatApp.get('{id}');

        // According to the documentation, I should be getting IntelliSense
        // suggestions for 'application.' at this point.

    })();
</script>

<p>Hello World</p>

Visual Studio is raising an error stating that it cannot find the 'jquery' reference. I am trying to determine the best approach to resolve this issue considering:

  1. This project does not utilize npm/bower dependencies at all, and I prefer to avoid them if possible.
  2. I checked the %LOCALAPPDATA%\Microsoft\TypeScript folder as mentioned in the article and found jQuery there.
  3. What if the KatApp.d.ts file has other interfaces that were necessary for compiling the TypeScript project but are now required because those types are not included inside KatApp.d.ts?

Update:

Following the suggestion by @EliasSchablowski, I used npm to install typings for jquery. In the screenshot below, you can see the types under the node_modules\@types folder along with my two *.d.ts files. I no longer encounter compile issues with jquery, but IntelliSense is still not functioning:

https://i.sstatic.net/I0Iqp.png

The next screenshot demonstrates IntelliSense working, but only when my KatApp.d.ts file is open in the editor:

https://i.sstatic.net/KCNN3.png

Is this the expected behavior?

Answer №1

I set up two test projects within a solution - one in TypeScript and the other in a non-TypeScript format (e.g. web application). I encountered an issue while testing these projects.

In my web application project, I placed the d.ts file in the wwwroot folder. However, upon viewing the page, an error was displayed: https://i.sstatic.net/8IlWn.png

It appears that the reference to jQuery in the d.ts file could not be found. To resolve this, I tried referencing the class KatApp directly from the TypeScript project in the web application, without including the d.ts file. Surprisingly, this approach worked flawlessly with no errors: https://i.sstatic.net/lERmr.png

According to information on Automatic acquisition of type definitions, the %LOCALAPPDATA%\Microsoft\TypeScript folder contains the package d.ts references. However, when I copied the d.ts file into the web application project, there seemed to be a disconnect between this path and the project itself. This discrepancy may explain why Visual Studio is unable to locate the 'jquery' reference.

In conclusion, if you encounter a missing package, ensure that the d.ts file referenced in another project (such as a web app) is located in the TypeScript project folder. Alternatively, you can utilize the npm install CLI in the web application: npm install @types/jquery -D

If there are any misunderstandings or further questions, please do not hesitate to reach out.

Answer №2

After the recent update, an issue arose with intellisense in VSCode related to locating IKatApp from the file browser and JSDoc type declaration. The recommended solution is to specify the path in tsconfig.json using typeRoot and types, as detailed in the tsconfig's documentation for typeRoot and types. This configuration should also be compatible with VSCode's JSDoc functionality.

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