feat: add settings page parser (#154)

* feat: add settings page parsers

* fix(AccountManager): small ts error

* feat: add `CopyLink` & `SettingsCheckbox`

* deps: remove “flat” dependency

src/utils/Utils.ts

@@ -1,4 +1,3 @@
-import Flatten from 'flat';
 import package_json from '../../package.json';
 import { FetchFunction } from './HTTPClient';
 import userAgents from './user-agents.json';
@@ -31,24 +30,6 @@ export class OAuthError extends InnertubeError { }
 export class PlayerError extends Error { }
 export class SessionError extends Error { }
 
-/**
- * Utility to help access deep properties of an object.
- * @param obj - the object.
- * @param key - key of the property being accessed.
- * @param target - anything that might be inside of the property.
- * @param depth - maximum number of nested objects to flatten.
- * @param safe - if set to true arrays will be preserved.
- */
-export function findNode(obj: any, key: string, target: string, depth: number, safe = true): any | any[] {
-  const flat_obj = Flatten(obj, { safe, maxDepth: depth || 2 }) as any;
-  const result = Object.keys(flat_obj).find((entry) => entry.includes(key) && JSON.stringify(flat_obj[entry] || '{}').includes(target));
-  if (!result)
-    throw new ParsingError(`Expected to find "${key}" with content "${target}" but got ${result}`, {
-      key, target, data_snippet: `${JSON.stringify(flat_obj, null, 4).slice(0, 300)}..`
-    });
-  return flat_obj[result];
-}
-
 /**
  * Compares given objects. May not work correctly for
  * objects with methods.
@@ -295,4 +276,4 @@ export const debugFetch: FetchFunction = (input, init) => {
 
 export function u8ToBase64(u8: Uint8Array) {
   return btoa(String.fromCharCode.apply(null, Array.from(u8)));
-}
+}