Guide to incorporating @types/module with the corresponding npm module that has type definitions available

This is an example of a module I am currently utilizing in my project.

I have come across TypeScript type definitions for the npm module polylabel, which can be found at https://github.com/mapbox/polylabel. When I run

npm install --save @types/polylabel
, I get the types. However, when I run npm install --save polylabel, I only get the npm module itself.

My question is how can I import polylabel while still using the TypeScript type definitions from @types/polylabel? For instance:

import polylabel from "polylabel";

export default class SomeClass extends Base {

   console.log(polylabel(coordinates, 1.0))
}

The above code will not work as expected, as TypeScript will attempt to import a function that is defined but not functional from the module itself.

Should I include the module in webpack directly, or is there another solution to this issue? As for the webpack configuration:

new webpack.ProvidePlugin({
  polylabel: 'polylabel'
}),

I hope this clarifies the question regarding the problem I am trying to solve.

Answer №1

Ensure that your tsconfig.json is configured to reference the @types directory to utilize types whenever they are accessible. While some npm packages include type definitions, many do not. In such cases, you can install types using

npm install @types/<module> --save-dev

Here is an example of a tsconfig.json file:

{
  "compileOnSave": true,
  "compilerOptions": {
    "baseUrl": "src",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types" // <-- This part
    ],
    "lib": [
      "es2016",
      "dom"
    ]
  },
  "exclude": [
    "node_modules",
    "e2e"
  ]
}

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