@auth0/auth0-spa-js/src/scope.ts

Auth0 SDK for Single Page Applications using Authorization Code Grant Flow with PKCE

/**
 * @ignore
 */
const dedupe = (arr: string[]) => Array.from(new Set(arr));

/**
 * @ignore
 */
export const getUniqueScopes = (...scopes: (string | undefined)[]) => {
  return dedupe(scopes.filter(Boolean).join(' ').trim().split(/\s+/)).join(' ');
};