Guide on utilizing external namespaces to define types in TypeScript and TSX

In my current project, I am working with scripts from Google and Facebook (as well as other external scripts like Intercom) in TypeScript by loading them through a script tag. However, I have encountered issues with most of them because I do not have access to their types for importing and using.

For instance, when working with Facebook, I installed the package @types/facebook-js-sdk from DefinitelyTyped. This allowed me to see the type of window.FB since it is declared in the namespace from the types package. But I am unable to import or use any type to define window.FB when passing it to another piece of code, as shown below:

// window.FB is typed here
const fb = new Facebook(window.FB)

class Facebook {
  // How can I type fb here?
  constructor(fb) {
    this.fb = fb
  }

Is there a way for me to utilize the namespace to obtain types, or do I need to write the types myself in this scenario? I am open to suggestions!

typescriptfacebook-javascript-sdk

Answer №1

If you need to determine the type of your typed window variable, you can use the typeof operator.

For instance,

class Facebook {
  fb: typeof window.FB

  constructor(fb: typeof window.FB) {
    if (typeof fb === 'undefined') {
      throw new Error('The Facebook API is not initialized!')
    }

    this.fb = fb
  }
}

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