@fluentui/styles/dist/es/deepmerge.js

A set of styling utilities for CSS-in-JS.

var isObject = function isObject(o) {
  return o !== null && typeof o === 'object' && !Array.isArray(o);
};
var isValid = function isValid(k) {
  return k !== '__proto__' && k !== 'prototype' && k !== 'constructor';
};

// Heads Up!
// Changes here need to consider breaking all object references.
// Merging should result in a themes that are non-mutated and have broken references.
export var deepmerge = function deepmerge() {
  var inner = function inner(target, source) {
    Object.keys(source).forEach(function (k) {
      if (isValid(k)) {
        if (isObject(source[k])) {
          if (!isObject(target[k])) {
            target[k] = {};
          }
          inner(target[k], source[k]);
        } else {
          target[k] = source[k]; // TODO: do deep clone for arrays? We currently do not have any deep arrays in variables
        }
      }
    });

    return target;
  };
  for (var _len = arguments.length, sources = new Array(_len), _key = 0; _key < _len; _key++) {
    sources[_key] = arguments[_key];
  }
  return sources.filter(Boolean).reduce(function (acc, src) {
    return inner(acc, src);
  }, {});
};
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