var isMergeableObject = function isMergeableObject(value) { return isNonNullObject(value) && !isSpecial(value) }; function isNonNullObject(value) { return !!value && typeof value === 'object' } function isSpecial(value) { var stringValue = Object.prototype.toString.call(value); return stringValue === '[object RegExp]' || stringValue === '[object Date]' || isReactElement(value) } // see https://github.com/facebook/react/blob/b5ac963fb791d1298e7f396236383bc955f916c1/src/isomorphic/classic/element/ReactElement.js#L21-L25 var canUseSymbol = typeof Symbol === 'function' && Symbol.for; var REACT_ELEMENT_TYPE = canUseSymbol ? Symbol.for('react.element') : 0xeac7; function isReactElement(value) { return value.$$typeof === REACT_ELEMENT_TYPE } function emptyTarget(val) { return Array.isArray(val) ? [] : {} } function cloneIfNecessary(value, optionsArgument) { var clone = optionsArgument && optionsArgument.clone === true; return (clone && isMergeableObject(value)) ? deepmerge(emptyTarget(value), value, optionsArgument) : value } function defaultArrayMerge(target, source, optionsArgument) { var destination = target.slice(); source.forEach(function(e, i) { if (typeof destination[i] === 'undefined') { destination[i] = cloneIfNecessary(e, optionsArgument); } else if (isMergeableObject(e)) { destination[i] = deepmerge(target[i], e, optionsArgument); } else if (target.indexOf(e) === -1) { destination.push(cloneIfNecessary(e, optionsArgument)); } }); return destination } function mergeObject(target, source, optionsArgument) { var destination = {}; if (isMergeableObject(target)) { Object.keys(target).forEach(function(key) { destination[key] = cloneIfNecessary(target[key], optionsArgument); }); } Object.keys(source).forEach(function(key) { if (!isMergeableObject(source[key]) || !target[key]) { destination[key] = cloneIfNecessary(source[key], optionsArgument); } else { destination[key] = deepmerge(target[key], source[key], optionsArgument); } }); return destination } function deepmerge(target, source, optionsArgument) { var sourceIsArray = Array.isArray(source); var targetIsArray = Array.isArray(target); var options = optionsArgument || { arrayMerge: defaultArrayMerge }; var sourceAndTargetTypesMatch = sourceIsArray === targetIsArray; if (!sourceAndTargetTypesMatch) { return cloneIfNecessary(source, optionsArgument) } else if (sourceIsArray) { var arrayMerge = options.arrayMerge || defaultArrayMerge; return arrayMerge(target, source, optionsArgument) } else { return mergeObject(target, source, optionsArgument) } } deepmerge.all = function deepmergeAll(array, optionsArgument) { if (!Array.isArray(array) || array.length < 2) { throw new Error('first argument should be an array with at least two elements') } // we are sure there are at least 2 values, so it is safe to have no initial value return array.reduce(function(prev, next) { return deepmerge(prev, next, optionsArgument) }) }; var deepmerge_1 = deepmerge; export default deepmerge_1;