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export namespace util {  export type AssertEqual<T, Expected> = [T] extends [Expected]    ? [Expected] extends [T]      ? true      : false    : false;
  export function assertNever(_x: never): never {    throw new Error();  }
  export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;  export type OmitKeys<T, K extends string> = Pick<T, Exclude<keyof T, K>>;  export type MakePartial<T, K extends keyof T> = Omit<T, K> &    Partial<Pick<T, K>>;
  export const arrayToEnum = <T extends string, U extends [T, ...T[]]>(    items: U  ): { [k in U[number]]: k } => {    const obj: any = {};    for (const item of items) {      obj[item] = item;    }    return obj as any;  };
  export const getValidEnumValues = (obj: any) => {    const validKeys = objectKeys(obj).filter(      (k: any) => typeof obj[obj[k]] !== "number"    );    const filtered: any = {};    for (const k of validKeys) {      filtered[k] = obj[k];    }    return objectValues(filtered);  };
  export const objectValues = (obj: any) => {    return objectKeys(obj).map(function (e) {      return obj[e];    });  };
  export const objectKeys: ObjectConstructor["keys"] =    typeof Object.keys === "function" // eslint-disable-line ban/ban      ? (obj: any) => Object.keys(obj) // eslint-disable-line ban/ban      : (object: any) => {          const keys = [];          for (const key in object) {            if (Object.prototype.hasOwnProperty.call(object, key)) {              keys.push(key);            }          }          return keys;        };
  export const find = <T>(    arr: T[],    checker: (arg: T) => any  ): T | undefined => {    for (const item of arr) {      if (checker(item)) return item;    }    return undefined;  };
  export type identity<T> = T;  export type flatten<T extends object> = identity<{ [k in keyof T]: T[k] }>;  export type noUndefined<T> = T extends undefined ? never : T;
  export const isInteger: NumberConstructor["isInteger"] =    typeof Number.isInteger === "function"      ? (val) => Number.isInteger(val) // eslint-disable-line ban/ban      : (val) =>          typeof val === "number" && isFinite(val) && Math.floor(val) === val;
  export function joinValues<T extends any[]>(    array: T,    separator = " | "  ): string {    return array      .map((val) => (typeof val === "string" ? `'${val}'` : val))      .join(separator);  }}