TS2688 Error: Type definition file for 'tooltip.js' not found

Why am I getting an 'undefined' error when trying to import the Tooltip class from the npm tooltip.js package in my TypeScript file?

Answer №1

When working with Typescript, it's important to have a type declaration file for tooltip.js.

This is because Typescript requires explicit type information for variables in the code. Since JavaScript lacks this type information, importing a JavaScript code file into a Typescript one necessitates a .d.ts file to aid Typescript in understanding the JavaScript code.

If you're dealing with your own JavaScript code, you could update it by adding type annotations to make it compatible with Typescript. However, tampering with 3rd party JavaScript libraries is not recommended. While some libraries come with their own type declarations, others may require you to either create a .d.ts file yourself or utilize one provided by the open-source community. Fortunately, there are plenty of type declarations available for various popular 3rd party JavaScript files on sites like DefinitelyTyped.

For further information, refer to this answer.

Answer №2

Dealing with a similar issue, I encountered it while working with the 'jspdf' library. Upon investigation, I found that my 'tsconfig.app.json' file mistakenly included 'jspdf' in the types array under compilerOptions.

After removing 'jspdf' from the configuration, the problem was resolved.

To rectify this, I made adjustments to the 'src/tsconfig.app.json' file:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
  "outDir": "../out-tsc/app",
  // "allowJs":true,
  "baseUrl": "./",
  "module": "es2015",
   "types": [
           "node"
           ]
   },
  "exclude": [
    "test.ts",
    "**/*.spec.ts",
  ]
}

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