utils.ts

export function isNumber(value: any): value is number {
  return typeof value === 'number';
}

export function isFunction(value: any): value is Function {
  return typeof value === 'function';
}

export function isObject(value: any): value is Record<string, any> {
  return typeof value === 'object';
}

export function localStorageAvailable() {
  try {
    // Incognito mode might reject access to the localStorage for security reasons.
    // window isn't defined on Node.js
    // https://stackoverflow.com/questions/16427636/check-if-localstorage-is-available
    const key = '__some_random_key_you_are_not_going_to_use__';
    window.localStorage.setItem(key, key);
    window.localStorage.removeItem(key);
    return true;
  } catch (err) {
    return false;
  }
}

export function escapeRegExp(value: string): string {
  return value.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
}

/**
 * Follows the CSS specification behavior for min and max
 * If min > max, then the min have priority
 */
export const clamp = (value: number, min: number, max: number) =>
  Math.max(min, Math.min(max, value));

/**
 * Based on `fast-deep-equal`
 *
 *  MIT License
 *
 * Copyright (c) 2017 Evgeny Poberezkin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * We only type the public interface to avoid dozens of `as` in the function.
 */
export function isDeepEqual<T>(actual: any, expected: T): actual is T;

export function isDeepEqual(a: any, b: any) {
  if (a === b) {
    return true;
  }

  if (a && b && typeof a === 'object' && typeof b === 'object') {
    if (a.constructor !== b.constructor) {
      return false;
    }

    if (Array.isArray(a)) {
      const length = a.length;
      if (length !== b.length) {
        return false;
      }
      for (let i = 0; i < length; i += 1) {
        if (!isDeepEqual(a[i], b[i])) {
          return false;
        }
      }
      return true;
    }

    if (a instanceof Map && b instanceof Map) {
      if (a.size !== b.size) {
        return false;
      }

      const entriesA = Array.from(a.entries());

      for (let i = 0; i < entriesA.length; i += 1) {
        if (!b.has(entriesA[i][0])) {
          return false;
        }
      }
      for (let i = 0; i < entriesA.length; i += 1) {
        const entryA = entriesA[i];
        if (!isDeepEqual(entryA[1], b.get(entryA[0]))) {
          return false;
        }
      }
      return true;
    }

    if (a instanceof Set && b instanceof Set) {
      if (a.size !== b.size) {
        return false;
      }

      const entries = Array.from(a.entries());
      for (let i = 0; i < entries.length; i += 1) {
        if (!b.has(entries[i][0])) {
          return false;
        }
      }
      return true;
    }

    if (ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {
      const length = (a as any).length;
      if (length !== (b as any).length) {
        return false;
      }
      for (let i = 0; i < length; i += 1) {
        if ((a as any)[i] !== (b as any)[i]) {
          return false;
        }
      }
      return true;
    }

    if (a.constructor === RegExp) {
      return a.source === b.source && a.flags === b.flags;
    }
    if (a.valueOf !== Object.prototype.valueOf) {
      return a.valueOf() === b.valueOf();
    }
    if (a.toString !== Object.prototype.toString) {
      return a.toString() === b.toString();
    }

    const keys = Object.keys(a);
    const length = keys.length;
    if (length !== Object.keys(b).length) {
      return false;
    }

    for (let i = 0; i < length; i += 1) {
      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) {
        return false;
      }
    }

    for (let i = 0; i < length; i += 1) {
      const key = keys[i];
      if (!isDeepEqual(a[key], b[key])) {
        return false;
      }
    }

    return true;
  }

  // true if both NaN, false otherwise
  // eslint-disable-next-line no-self-compare
  return a !== a && b !== b;
}