fix type errors

static_src/TwitchAuth.ts

@@ -86,7 +86,7 @@ export function requestAccessToken(client_id: string, ...scopes: Array<string>)
  * @param {Array<string>|string} scopes 
  * @returns {Promise<AuthCode>}
  */
-export function requestAuthCode(client_id: string, ...scopes: Array<string>): Promise<any> {
+export function requestAuthCode(client_id: string, ...scopes: Array<string>): Promise<never> {
     console.debug('requesting authorization code')
     const url = new URL('https://id.twitch.tv/oauth2/authorize')
     url.searchParams.append('response_type', 'code')
@@ -178,7 +178,7 @@ export function refreshToken(client_id: string, refresh_token: string): Promise<
  * @param {string} client_id 
  * @returns {TwitchToken}
  */
-export async function getUserToken(client_id: string, ...scopes): Promise<TwitchToken> {
+export async function getUserToken(client_id: string, ...scopes:string[]): Promise<TwitchToken> {
     const token=await getUserTokenPassive(client_id, ...scopes)
     if(!token){
         return requestAuthCode(client_id, ...scopes)
@@ -193,19 +193,19 @@ export async function getUserToken(client_id: string, ...scopes): Promise<Twitch
  * @param {string} client_id 
  * @returns {TwitchToken}
  */
-export async function getUserTokenPassive(client_id: string, ...scopes): Promise<TwitchToken>{
+export async function getUserTokenPassive(client_id: string, ...scopes:string[]): Promise<TwitchToken|null>{
     console.debug('scopes requested:',...scopes)
     const params = new URLSearchParams(location.search + '&' + location.hash.substring(1))
     if (params.has('code')) {
-        const code = params.get('code')
+        const code = params.get('code')!
         history.replaceState(null, '', redirect_uri)
         return exchangeCode(client_id, code)
     }
     if (params.has('refresh_token')) {
-        return refreshToken(client_id, params.get('refresh_token'))
+        return refreshToken(client_id, params.get('refresh_token')!)
     }
     if (params.has('access_token')) {
-        return validateToken(params.get('access_token'))
+        return validateToken(params.get('access_token')!)
     }
     if (params.has('error')) {
         const error_message = params.get('error') + ': ' + params.get('error_description')