Error: The function $.cookie() is not defined in Angular2 Typescript

After installing @types/jquery, I updated tsconfig.json to include jquery.cookie in the types section. Visual Studio Code indicates that $.cookie is ready for use, but when I execute my code, an error appears in the console stating that $.cookie() is not a function. What could be causing this issue? Is there something crucial that I overlooked? Do I need to reference it in another location?

Answer №1

Did you remember to include the jquery.cookie package in your code? Or just the

@types/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f892898d9d8a81d69b979dcfaf">[email protected]</a>
?

@types are solely definition files for TypeScript, not the actual code itself. It's important to install the actual code:

npm install --save jquery.cookie

Next, ensure it is added to your packaging, particularly for SystemJS:

SystemJS.config({
    'map': {
        'jquery.cookie': 'npm:jquery.cookie'
    },
    'paths': {
        'npm:': 'node_modules/'
    }
});

To summarize:

  • @types are definitions that enable TypeScript to understand JavaScript code/packages. These should not be imported directly into the code, but rather installed so that the TypeScript compiler can find them in node_modules/@types.
  • The package intended for use with TypeScript must still be installed using npm (or yarn). This contains the actual code.

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