Saving all progress

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Luke Hagar
2025-03-19 22:47:50 -05:00
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MIT License
Copyright (c) 2021 AsyncBanana
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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<div align="center">
![Microdiff Logo](https://raw.githubusercontent.com/AsyncBanana/microdiff/master/Logo.svg)
Microdiff is a tiny (<1kb), fast, zero dependency object and array comparison library. It is significantly faster than most other deep comparison libraries, and has full TypeScript support.
> 💡 I recommend reading this blog post:
>
> **[Building the fastest object and array differ](https://byteofdev.com/posts/microdiff/)** for an explanation of how Microdiff achieves its size and speed.
![Minizipped Size (from Bundlephobia)](https://img.shields.io/bundlephobia/minzip/microdiff?style=flat-square) ![License](https://img.shields.io/npm/l/microdiff?style=flat-square) ![dependency Count](https://img.shields.io/badge/dependencies-0-green?style=flat-square)
</div>
# Features
- 🚀 More than double the speed of other object diff libraries
- 📦 Extremely lightweight, <1kb minified
- 🌎 Supports Deno, Node, Bun, the web, and even service workers. Also comes with built-in Typescript types
- 🔰 Very easy to use, having just a single `diff()` function
- 📅 Full support for objects like `new Date()` and `new RegExp()`
# Get started
First, install Microdiff
```
npm i microdiff
```
If you are using Deno, you can import it from Deno.land with the link `https://deno.land/x/microdiff@VERSION/index.ts` (remember to change `@VERSION` to the version you want to use).
After you install it, import it and run it on two objects.
```js
import diff from "microdiff";
const obj1 = {
originalProperty: true,
};
const obj2 = {
originalProperty: true,
newProperty: "new",
};
console.log(diff(obj1, obj2));
// [{type: "CREATE", path: ["newProperty"], value: "new"}]
```
If you are using CommonJS, you can import it like this:
```js
const diff = require("microdiff").default;
```
There are three different types of changes: `CREATE`, `REMOVE`, and `CHANGE`.
The `path` property gives a path to the property in the new object (or the old object in the case of `REMOVE`).
Each element in the paths is a key to the next property a level deeper until you get to the property changed, and it is a string or a number, depending on whether the object is an Array or Object (Objects with number keys will still be strings).
The `value` property exists in types `CREATE` and `CHANGE`, and it contains the value of the property added/changed/deleted.
The `oldValue` property exists in the type `CHANGE` and `REMOVE`, and it contains the old value of the property.
# Cycles support
By default, Microdiff supports cyclical references, but if you are sure that the object has no cycles like parsed JSON, you can disable cycles using the `cyclesFix` option.
```js
diff(obj1, obj2, { cyclesFix: false });
```
# Benchmarks
```
Geometric mean of time per operation relative to Microdiff (no cycles) (100%==equal time, lower is better)
microdiff (no cycles): 100%
microdiff: 149%
deep-diff: 197%
deep-object-diff: 288%
jsDiff: 1565%
```
These results are from a suite of benchmarks matching real world use cases of multiple open-source repos using various diffing algorithm, running under Node 22.12.0 on a Ryzen 7950x clocked at ~4.30 GHz. The benchmarks are run through [mitata](https://github.com/evanwashere/mitata) to minimize random variation and time most accurately. You can view the full benchmark code in [bench.js](https://github.com/AsyncBanana/microdiff/blob/master/bench.js) and the benchmarks themselves at [benchmarks/applied](https://github.com/AsyncBanana/microdiff/tree/master/benchmarks/applied).
Of course, [these benchmarks should be taken with a grain of salt](https://byteofdev.com/posts/javascript-benchmarking-mess/) due to the inherent errors present in benchmarking JavaScript, but if you want to run them on your own computer in your own runtime/setup, run `bench.js`.
# Contributing
Thanks for helping the project out! Contributing is pretty simple. Fork the repository (if you need more information on how to do this, check out [this GitHub guide](https://docs.github.com/en/get-started/quickstart/contributing-to-projects)), clone it to your computer, and start programming! To compile the program, run `npm run build` (replace `npm` with `pnpm` or `yarn` if you are using one of those). This will create CommonJS and ESM modules in `/dist`.
To benchmark microdiff, you can run `npm run bench`. This will automatically build Microdiff and run a benchmarking program comparing microdiff to other common diffing libraries.
Finally, Microdiff has an extensive test suite which you should take advantage of. To make sure everything is working correctly, you can run `npm run test`. `npm run test` builds the project and then runs the entire test suite on the new version. If you are fixing a bug, be sure to add a test for that.
Also, make sure you read the [Code of Conduct](https://github.com/AsyncBanana/microdiff/blob/master/CODE_OF_CONDUCT.md) before contributing.

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = diff;
const richTypes = { Date: true, RegExp: true, String: true, Number: true };
function diff(obj, newObj, options = { cyclesFix: true }, _stack = []) {
let diffs = [];
const isObjArray = Array.isArray(obj);
for (const key in obj) {
const objKey = obj[key];
const path = isObjArray ? +key : key;
if (!(key in newObj)) {
diffs.push({
type: "REMOVE",
path: [path],
oldValue: obj[key],
});
continue;
}
const newObjKey = newObj[key];
const areCompatibleObjects = typeof objKey === "object" &&
typeof newObjKey === "object" &&
Array.isArray(objKey) === Array.isArray(newObjKey);
if (objKey &&
newObjKey &&
areCompatibleObjects &&
!richTypes[Object.getPrototypeOf(objKey)?.constructor?.name] &&
(!options.cyclesFix || !_stack.includes(objKey))) {
diffs.push.apply(diffs, diff(objKey, newObjKey, options, options.cyclesFix ? _stack.concat([objKey]) : []).map((difference) => {
difference.path.unshift(path);
return difference;
}));
}
else if (objKey !== newObjKey &&
// treat NaN values as equivalent
!(Number.isNaN(objKey) && Number.isNaN(newObjKey)) &&
!(areCompatibleObjects &&
(isNaN(objKey)
? objKey + "" === newObjKey + ""
: +objKey === +newObjKey))) {
diffs.push({
path: [path],
type: "CHANGE",
value: newObjKey,
oldValue: objKey,
});
}
}
const isNewObjArray = Array.isArray(newObj);
for (const key in newObj) {
if (!(key in obj)) {
diffs.push({
type: "CREATE",
path: [isNewObjArray ? +key : key],
value: newObj[key],
});
}
}
return diffs;
}

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export interface DifferenceCreate {
type: "CREATE";
path: (string | number)[];
value: any;
}
export interface DifferenceRemove {
type: "REMOVE";
path: (string | number)[];
oldValue: any;
}
export interface DifferenceChange {
type: "CHANGE";
path: (string | number)[];
value: any;
oldValue: any;
}
export type Difference = DifferenceCreate | DifferenceRemove | DifferenceChange;
interface Options {
cyclesFix: boolean;
}
export default function diff(obj: Record<string, any> | any[], newObj: Record<string, any> | any[], options?: Partial<Options>, _stack?: Record<string, any>[]): Difference[];
export {};

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export interface DifferenceCreate {
type: "CREATE";
path: (string | number)[];
value: any;
}
export interface DifferenceRemove {
type: "REMOVE";
path: (string | number)[];
oldValue: any;
}
export interface DifferenceChange {
type: "CHANGE";
path: (string | number)[];
value: any;
oldValue: any;
}
export type Difference = DifferenceCreate | DifferenceRemove | DifferenceChange;
interface Options {
cyclesFix: boolean;
}
export default function diff(obj: Record<string, any> | any[], newObj: Record<string, any> | any[], options?: Partial<Options>, _stack?: Record<string, any>[]): Difference[];
export {};

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const richTypes = { Date: true, RegExp: true, String: true, Number: true };
export default function diff(obj, newObj, options = { cyclesFix: true }, _stack = []) {
let diffs = [];
const isObjArray = Array.isArray(obj);
for (const key in obj) {
const objKey = obj[key];
const path = isObjArray ? +key : key;
if (!(key in newObj)) {
diffs.push({
type: "REMOVE",
path: [path],
oldValue: obj[key],
});
continue;
}
const newObjKey = newObj[key];
const areCompatibleObjects = typeof objKey === "object" &&
typeof newObjKey === "object" &&
Array.isArray(objKey) === Array.isArray(newObjKey);
if (objKey &&
newObjKey &&
areCompatibleObjects &&
!richTypes[Object.getPrototypeOf(objKey)?.constructor?.name] &&
(!options.cyclesFix || !_stack.includes(objKey))) {
diffs.push.apply(diffs, diff(objKey, newObjKey, options, options.cyclesFix ? _stack.concat([objKey]) : []).map((difference) => {
difference.path.unshift(path);
return difference;
}));
}
else if (objKey !== newObjKey &&
// treat NaN values as equivalent
!(Number.isNaN(objKey) && Number.isNaN(newObjKey)) &&
!(areCompatibleObjects &&
(isNaN(objKey)
? objKey + "" === newObjKey + ""
: +objKey === +newObjKey))) {
diffs.push({
path: [path],
type: "CHANGE",
value: newObjKey,
oldValue: objKey,
});
}
}
const isNewObjArray = Array.isArray(newObj);
for (const key in newObj) {
if (!(key in obj)) {
diffs.push({
type: "CREATE",
path: [isNewObjArray ? +key : key],
value: newObj[key],
});
}
}
return diffs;
}

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{
"name": "microdiff",
"version": "1.5.0",
"description": "Small, fast, zero dependency deep object and array comparison",
"main": "./dist/index.cjs",
"module": "./dist/index.js",
"exports": {
"import": "./dist/index.js",
"require": "./dist/index.cjs"
},
"scripts": {
"build": "tsc --module CommonJS && mv \"dist/index.js\" \"dist/index.cjs\" && mv \"dist/index.d.ts\" \"dist/index.d.cts\" && tsc --module es2020 && prettier -w dist/*",
"test": "npm run build && node --test ./tests/*",
"bench": "npm run build && node --expose-gc bench.js",
"prepublish": "npm run build"
},
"keywords": [
"diff",
"comparison"
],
"author": "AsyncBanana",
"license": "MIT",
"files": [
"dist"
],
"devDependencies": {
"deep-diff": "^1.0.2",
"deep-object-diff": "^1.1.9",
"diff": "^7.0.0",
"mitata": "^1.0.19",
"picocolors": "^1.1.1",
"prettier": "^3.4.1",
"typescript": "^5.7.2"
},
"type": "module",
"repository": {
"type": "git",
"url": "https://github.com/AsyncBanana/microdiff"
},
"homepage": "https://github.com/AsyncBanana/microdiff#readme",
"bugs": "https://github.com/AsyncBanana/microdiff/issues"
}