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If you are trying to use this command in Visual Studio 2022;

npm install --save-dev @types/jquery

and hit by self-signed certificate error in certificate chain. Try to use this command in a Terminal window on the root of Presentation project;

npm set strict-ssl false
npm install --save-dev @types/jquery
npm install --save-dev @types/jqueryui

This will create Package-lock.json file with the following content;

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "@types/jquery": {
      "version": "3.5.20",
      "resolved": "https://registry.npmjs.org/@types/jquery/-/jquery-3.5.20.tgz",
      "requires": {
        "@types/sizzle": "*"
      }
    },
    "@types/jqueryui": {
      "version": "1.12.18",
      "resolved": "https://registry.npmjs.org/@types/jqueryui/-/jqueryui-1.12.18.tgz",
      "dev": true,
      "requires": {
        "@types/jquery": "*"
      }
    },
    "@types/sizzle": {
      "version": "2.3.4",
      "resolved": "https://registry.npmjs.org/@types/sizzle/-/sizzle-2.3.4.tgz"
    }
  }
}

Start typing $ and you will immediately start seeing jQuery methods. Now, You can use Typescript with jQuery and jQuery UI.

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