Extended OAuth2User in twitter-api-sdk to allow external injection of codeVerifier and codeChallenge.

TwitterOauthService.ts

import {OAuth2User, OAuth2UserOptions} from "twitter-api-sdk/dist/OAuth2User.js";

export default class TwitterOauthService extends OAuth2User {
  #options: OAuth2UserOptions
  #code_verifier?: string
  #code_challenge?: string

  /**
   * Modified so that codeVerifier and codeChallenge can be set in the constructor.
   * Also, codeVerifier and codeChallenge need to be saved in cookies etc., so I made a getter.
   * @param tokenObject
   * @param codeVerifier
   * @param codeChallenge
   */
  constructor(tokenObject: any = undefined, codeVerifier: string | undefined = undefined, codeChallenge: string | undefined = undefined) {
    const options: OAuth2UserOptions = {
      client_id: 'client_id', // Acquired from environment variables, etc.
      client_secret: 'client_secret',
      callback: "callback_url",
      scopes: ["tweet.read", "users.read", "follows.read", "offline.access"],
      token: tokenObject,
    }
    super(options)
    const {token, ...defaultOptions} = options
    this.#options = defaultOptions
    this.#code_verifier = codeVerifier
    this.#code_challenge = codeChallenge
    this.token = token
  }

  public getCodeVerifier(): string | undefined {
    return this.#code_verifier;
  }

  public getCodeChallenge(): string | undefined {
    return this.#code_challenge
  }
}