firebase-admin choose password reset link language, i.e. Spanish

Question

I have seen how to set the password reset language in the browser (firebase/auth) with useDeviceLanguage(), however I have not seen how to create the password reset link with firebase-admin

The code with firebase-admin to reset the password is below, but how can you change the language to, say, Spanish? The templates exist already in firebase.

const getPasswordResetLink = async email => {
  // HOW TO CHANGE LANGUAGE? 
  return admin.auth().generatePasswordResetLink(email)
}

Answer 1

Solution: The link generates a lang property in the query string, you can manually change this after you get the link to say lang=es.

const getPasswordResetLink = async (email, languageSymbol) => {
  const link = await admin.auth().generatePasswordResetLink(email)
  const url = new URL(link)
  if (languageSymbol) {
    url.searchParams.set('lang', languageSymbol)
  }

  return url.toString()
}

As for the second argument in generatePasswordResetLink(), it doesn't appear there are any useful options to have this set from firebase, you need to do the solution above. Here is the second argument options for reference https://github.com/firebase/firebase-admin-node/blob/bf4bacb18dc2e500a54ae7aa93b2db334c6ad4db/src/auth/index.ts#L947