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If you see `Error: merge is not a function`, add this alias to your Webpack config: ``` alias: { deepmerge$: path.resolve(__dirname, 'node_modules/deepmerge/dist/umd.js'), } ``` ## Getting Started ### Example Usage ```js var x = { foo: { bar: 3 }, array: [{ does: 'work', too: [ 1, 2, 3 ] }] } var y = { foo: { baz: 4 }, quux: 5, array: [{ does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' }] } var expected = { foo: { bar: 3, baz: 4 }, array: [{ does: 'work', too: [ 1, 2, 3 ] }, { does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' }], quux: 5 } merge(x, y) // => expected ``` ### Installation With [npm](http://npmjs.org) do: ```sh npm install deepmerge ``` deepmerge can be used directly in the browser without the use of package managers/bundlers as well: [UMD version from unpkg.com](https://unpkg.com/deepmerge/dist/umd.js). ### Includes CommonJS: ``` var merge = require('deepmerge') ``` ES Modules: ``` import merge from 'deepmerge' ``` # API ## `merge(x, y, [options])` Merge two objects `x` and `y` deeply, returning a new merged object with the elements from both `x` and `y`. If an element at the same key is present for both `x` and `y`, the value from `y` will appear in the result. Merging creates a new object, so that neither `x` or `y` is modified. **Note:** By default, arrays are merged by concatenating them. ## `merge.all(arrayOfObjects, [options])` Merges any number of objects into a single result object. ```js var x = { foo: { bar: 3 } } var y = { foo: { baz: 4 } } var z = { bar: 'yay!' } var expected = { foo: { bar: 3, baz: 4 }, bar: 'yay!' } merge.all([x, y, z]) // => expected ``` ## Options ### `arrayMerge` There are multiple ways to merge two arrays, below are a few examples but you can also create your own custom function. #### Overwrite Array Overwrites the existing array values completely rather than concatenating them ```js const overwriteMerge = (destinationArray, sourceArray, options) => sourceArray merge( [1, 2, 3], [3, 2, 1], { arrayMerge: overwriteMerge } ) // => [3, 2, 1] ``` #### Combine Array Combine arrays, such as overwriting existing defaults while also adding/keeping values that are different names To use the legacy (pre-version-2.0.0) array merging algorithm, use the following: ```js const emptyTarget = value => Array.isArray(value) ? [] : {} const clone = (value, options) => merge(emptyTarget(value), value, options) function combineMerge(target, source, options) { const destination = target.slice() source.forEach(function(e, i) { if (typeof destination[i] === 'undefined') { const cloneRequested = options.clone !== false const shouldClone = cloneRequested && options.isMergeableObject(e) destination[i] = shouldClone ? clone(e, options) : e } else if (options.isMergeableObject(e)) { destination[i] = merge(target[i], e, options) } else if (target.indexOf(e) === -1) { destination.push(e) } }) return destination } merge( [{ a: true }], [{ b: true }, 'ah yup'], { arrayMerge: combineMerge } ) // => [{ a: true, b: true }, 'ah yup'] ``` ### `isMergeableObject` By default, deepmerge clones every property from almost every kind of object. You may not want this, if your objects are of special types, and you want to copy the whole object instead of just copying its properties. You can accomplish this by passing in a function for the `isMergeableObject` option. If you only want to clone properties of plain objects, and ignore all "special" kinds of instantiated objects, you probably want to drop in [`is-plain-object`](https://github.com/jonschlinkert/is-plain-object). ```js const isPlainObject = require('is-plain-object') function SuperSpecial() { this.special = 'oh yeah man totally' } const instantiatedSpecialObject = new SuperSpecial() const target = { someProperty: { cool: 'oh for sure' } } const source = { someProperty: instantiatedSpecialObject } const defaultOutput = merge(target, source) defaultOutput.someProperty.cool // => 'oh for sure' defaultOutput.someProperty.special // => 'oh yeah man totally' defaultOutput.someProperty instanceof SuperSpecial // => false const customMergeOutput = merge(target, source, { isMergeableObject: isPlainObject }) customMergeOutput.someProperty.cool // => undefined customMergeOutput.someProperty.special // => 'oh yeah man totally' customMergeOutput.someProperty instanceof SuperSpecial // => true ``` ### `clone` *Deprecated.* Defaults to `true`. If `clone` is `false` then child objects will be copied directly instead of being cloned. This was the default behavior before version 2.x. # Testing With [npm](http://npmjs.org) do: ```sh npm test ``` # License MIT