@globalfishingwatch/react-map-gl/dist/es6/utils/deep-equal.js

A React wrapper for MapboxGL-js and overlay API.

export default function deepEqual(a, b) {
  if (a === b) {
    return true;
  }

  if (!a || !b) {
    return false;
  }

  if (Array.isArray(a)) {
    if (!Array.isArray(b) || a.length !== b.length) {
      return false;
    }

    for (let i = 0; i < a.length; i++) {
      if (!deepEqual(a[i], b[i])) {
        return false;
      }
    }

    return true;
  } else if (Array.isArray(b)) {
    return false;
  }

  if (typeof a === 'object' && typeof b === 'object') {
    const aKeys = Object.keys(a);
    const bKeys = Object.keys(b);

    if (aKeys.length !== bKeys.length) {
      return false;
    }

    for (const key of aKeys) {
      if (!b.hasOwnProperty(key)) {
        return false;
      }

      if (!deepEqual(a[key], b[key])) {
        return false;
      }
    }

    return true;
  }

  return false;
}
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