youtube-music/src/config/index.ts

import { deepmergeCustom } from 'deepmerge-ts';

import defaultConfig from './defaults';

import store, { IStore } from './store';
import plugins from './plugins';

import { restart } from '@/providers/app-controls';

const deepmerge = deepmergeCustom({
  mergeArrays: false,
});

const set = (key: string, value: unknown) => {
  store.set(key, value);
};
const setPartial = (key: string, value: object, defaultValue?: object) => {
  const newValue = deepmerge(defaultValue ?? {}, store.get(key) ?? {}, value);
  store.set(key, newValue);
};

function setMenuOption(key: string, value: unknown) {
  set(key, value);
  if (store.get('options.restartOnConfigChanges')) {
    restart();
  }
}

// MAGIC OF TYPESCRIPT

type Prev = [
  never,
  0,
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
  11,
  12,
  13,
  14,
  15,
  16,
  17,
  18,
  19,
  20,
  ...0[],
];
type Join<K, P> = K extends string | number
  ? P extends string | number
    ? `${K}${'' extends P ? '' : '.'}${P}`
    : never
  : never;
type Paths<T, D extends number = 10> = [D] extends [never]
  ? never
  : T extends object
    ? {
        [K in keyof T]-?: K extends string | number
          ? `${K}` | Join<K, Paths<T[K], Prev[D]>>
          : never;
      }[keyof T]
    : '';

type SplitKey<K> = K extends `${infer A}.${infer B}` ? [A, B] : [K, string];
type PathValue<T, K extends string> =
  SplitKey<K> extends [infer A extends keyof T, infer B extends string]
    ? PathValue<T[A], B>
    : T;

const get = <Key extends Paths<typeof defaultConfig>>(key: Key) =>
  store.get(key) as PathValue<typeof defaultConfig, typeof key>;

export default {
  defaultConfig,
  get,
  set,
  setPartial,
  setMenuOption,
  edit: () => store.openInEditor(),
  watch(cb: Parameters<IStore['onDidAnyChange']>[0]) {
    store.onDidAnyChange(cb);
  },
  plugins,
};