The error message "Property <property> is not recognized on the type 'jQueryStatic<HTMLElement>'" is indicating an issue with accessing a specific property within the TypeScript codebase that utilizes Angular CLI, NPM,

My Development Environment

I am utilizing Angular, Angular CLI, NPM, and Typescript in my web application development.

Within one of my components, I require the use of jQuery to initialize a jQuery plugin. In this particular case, the plugin in question is backstretch. Although the specific plugin may vary, the issue detailed below would be consistent for any jQuery plugin.

Despite common suggestions against using Angular and jQuery side by side, there remains significant utility in employing reusable jQuery plugins within an Angular project.

The Challenge at Hand

Although while coding in the VS Code IDE, IntelliSense indicates that both jQuery and backstretch properties are recognized without errors, a problem arises during the "ng serve" execution, as TypeScript transpiles the code into JavaScript.

This results in the following error message displayed in the console:

ERROR in C:/wamp/www/PaperbackComingSoon/Angular/my-app/src/app/app.component.ts (20,7): Property 'backstretch' does not exist on type 'JQueryStatic'.

A screenshot showing this error, alongside the jsconfig.json file and the installed type definitions for jQuery and Backstretch can be found here.

While the compiler seems to recognize jQuery, it encounters difficulties finding backstretch for unknown reasons. The actual type definition for backstretch is visible in this screenshot.

Seeking Answers

What aspect am I overlooking? Any insights into what might be causing this issue? Could it be possible that the version of the type definition file for the Backstretch plugin doesn't align with the actual jQuery Backstretch plugin?

Given my utilization of TypeScript, I aim to fully leverage all available typing files for jQuery plugins to ensure strong typing. While a makeshift solution could involve defining typings manually and setting all jQuery plugins as type "any," such an approach doesn't seem appropriate. My intention is to make use of all typing files accessible to me. Despite the compiler's inability to locate the defined property, there appears to be no reason not to benefit from existing typing files.


Potential Explanations

My hypothesis points towards a potential discrepancy between the TS versions globally installed on my system compared to the TypeScript version within the VS Code IDE environment. Checking the TS version within VSCode status bar reveals 2.4.2.

To contrast, running "tsc -v" command in the console yields 1.0.3.0 (given my prior work with TypeScript in Visual Studio). Even post executing "npm install -g [email protected]", the version remains unaffected.

Any thoughts or recommendations on this matter?

Answer ā„–1

Keeping Your Packages Current

npm install npm@latest -g

Ensuring TypeScript is Up-to-Date

npm -g upgrade typescript

Alternatively, you can also use:

npm install typescript@latest -g

Answer ā„–2

After much searching, I have finally uncovered the solution. Follow the steps outlined below.

1. Ensure that you have the most recent version of Node JS installed on your system

2. Execute "npm install typescript@latest -g" in the console

3. Use the command "tsc -v" in the console to check the TypeScript version

  • Verify that this version is indeed the most recent one and matches the information displayed in the VSCode status bar:

4. Create a directory within your angular app named "typings" and inside it, generate a file titled "< plugin name >.d.ts" (in this case, "backstretch.d.ts").

5. Visit the typings site for the relevant plugin ("Backstretch" in this scenario), copy the content of the .d.ts file, paste it into the previously created file, and save the modifications.

6. Run "ng serve" in the console, and verify that the build completes without any issues.

MISSION ACCOMPLISHED!


Additional details regarding the aforementioned solution

  • I am still uncertain as to why the installed typing under node_modules/@types/jquery-backstretch is not being recognized, leading to compilation errors when running ng serve.
  • In contrast, placing the typing file within the app folder, as described in step #5 above, results in the successful recognition of typings and expected functionality.
  • It is recommended to have npm installed in "C:\Users\ < username > \AppData\Roaming\npm," where "AppData" may be a hidden directory (refer to this guide for instructions on revealing hidden folders).
  • The location for installing typescript should be ""C:\Users\ < username > \AppData\Roaming\npm\node_modules\typescript""

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