visulimaVisulima Deep Clone
Really Fast Deep Clone.
Daniel Bannert's open source work is supported by the community on GitHub Sponsors
Install
npm install @visulima/deep-cloneyarn add @visulima/deep-clonepnpm add @visulima/deep-cloneUsage
Copy or deep clone an input value to an arbitrary depth. The function accepts both objects and primitives.
import deepClone from "@visulima/deep-clone";
const cloned = deepClone({ a: 1, b: { c: 2 } });
console.log(cloned); // => {a: 1, b: {c: 2}}API
deepClone(input, options?)
input
Type: any
The input value to copy.
options
Type: object
strict
Type: boolean
Default: false
If true, it will copy all properties, including non-enumerable ones and symbols.
handlers
Type: object
A set of custom handlers for specific type of value. Each handler is a function that takes the original value and returns a new value or throws an error if the value is not supported.
- Array: InternalHandler<unknown[]>;
- ArrayBuffer: InternalHandler<ArrayBuffer>;
- Blob: InternalHandler<Blob>;
- DataView: InternalHandler<DataView>;
- Date: InternalHandler<Date>;
- Error: InternalHandler<Error>;
- Float32Array: InternalHandler<Float32Array>;
- Float64Array: InternalHandler<Float64Array>;
- Int8Array: InternalHandler<Int8Array>;
- Int16Array: InternalHandler<Int16Array>;
- Int32Array: InternalHandler<Int32Array>;
- Map: InternalHandler<Map<unknown, unknown>>;
- Object: InternalHandler<Record<string, unknown>>;
- Promise: InternalHandler<Promise<unknown>>;
- RegExp: InternalHandler<RegExp>;
- Set: InternalHandler<Set<unknown>>;
- WeakMap: InternalHandler<WeakMap<any, unknown>>;
- WeakSet: InternalHandler<WeakSet<any>>;
Utils
copyOwnProperties(input)
Copy all properties contained on the object.
import { copyOwnProperties } from "@visulima/deep-clone/utils";
const obj = { a: 1, b: 2 };
const copy = copyOwnProperties(obj);
console.log(copy); // => {a: 1, b: 2}getCleanClone(input)
Get an empty version of the object with the same prototype it has.
import { getCleanClone } from "@visulima/deep-clone/utils";
const obj = { a: 1, b: 2 };
const clean = getCleanClone(obj);
console.log(clean); // => {}Notes
List of supported values/types:
undefined(original value is returned)null(original value is returned)boolean/Boolean(original value is returned)string/String(original value is returned)number/Number(original value is returned)functionObjectDateRegExpSetMapErrorURIErrorReferenceErrorSyntaxErrorRangeErrorEvalErrorTypeErrorSystem Error(Node.js)ArrayInt8ArrayUint8ArrayUint8ClampedArrayInit16ArrayUint16ArrayInt32ArrayUint32ArrayFloat32ArrayFloat64ArrayBuffer(Node.js)DataViewBlob
List of unsupported values/types:
DOMElement: to copy DOM elements, useelement.cloneNode().SymbolWeakMapWeakSetFileFileListImageDataImageBitmapPromiseSharedArrayBuffer
The implementation can handle circular references.
- If a
Number,String, orBooleanobject is encountered, the value is cloned as a primitive. This behavior is intentional. The implementation is opinionated in wanting to avoid creatingnumbers,strings, andbooleansvia thenewoperator and a constructor. - The implementation only checks whether basic
Objects,Arrays, and class instances areextensible,sealed, and/orfrozen. functionsare not cloned; their reference is copied.- The implementation supports custom
errortypes which areErrorinstances (e.g., ES2015 subclasses).
Benchmarks
Note:
It is true that jsondiffpatch.clone() from jsondiffpatch is faster than @visulima/deep-clonse in this particular benchmark, but it cannot handle as many situations as @visulima/deep-clonse can.
It is true that fastest-json-copy is faster than @visulima/deep-clonse in this particular benchmark. Also, fastest-json-copy has such huge limitations that it is rarely useful. For example, it treats things like Date and Map instances the same as empty {}. It can't handle circular references.
plain-object-clone is also really limited in capability.
Supported Node.js Versions
Libraries in this ecosystem make the best effort to track Node.js’ release schedule. Here’s a post on why we think this is important.
Contributing
If you would like to help take a look at the list of issues and check our Contributing guild.
Note: please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.
Credits
License
The visulima deep-clone is open-sourced software licensed under the MIT