praneshr / React Diff Viewer

A simple and beautiful text diff viewer component made with Diff and React.

Inspired from Github diff viewer, it includes features like split view, inline view, word diff, line highlight and more. It is highly customizable and it supports almost all languages.

Check here for v2.0

Install

yarn add react-diff-viewer

# or

npm i react-diff-viewer

Usage

import React, { PureComponent } from 'react';
import ReactDiffViewer from 'react-diff-viewer';

const oldCode = `
const a = 10
const b = 10
const c = () => console.log('foo')

if(a > 10) {
  console.log('bar')
}

console.log('done')
`;
const newCode = `
const a = 10
const boo = 10

if(a === 10) {
  console.log('bar')
}
`;

class Diff extends PureComponent {
  render = () => {
    return (
      <ReactDiffViewer oldValue={oldCode} newValue={newCode} splitView={true} />
    );
  };
}

Props

Instance Methods

resetCodeBlocks() - Resets the expanded code blocks to it's initial state. Return true on successful reset and false during unsuccessful reset.

Syntax Highlighting

Syntax highlighting is a bit tricky when combined with diff. Here, React Diff Viewer provides a simple render prop API to handle syntax highlighting. Use renderContent(content: string) => JSX.Element and your favorite syntax highlighting library to achieve this.

An example using Prism JS

// Load Prism CSS
<link
  href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.15.0/prism.min.css"
/>

// Load Prism JS
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.15.0/prism.min.js"></script>

import React, { PureComponent } from 'react';
import ReactDiffViewer from 'react-diff-viewer';

const oldCode = `
const a = 10
const b = 10
const c = () => console.log('foo')

if(a > 10) {
  console.log('bar')
}

console.log('done')
`;
const newCode = `
const a = 10
const boo = 10

if(a === 10) {
  console.log('bar')
}
`;

class Diff extends PureComponent {
  highlightSyntax = str => (
    <pre
      style={{ display: 'inline' }}
      dangerouslySetInnerHTML={{
        __html: Prism.highlight(str, Prism.languages.javascript),
      }}
    />
  );

  render = () => {
    return (
      <ReactDiffViewer
        oldValue={oldCode}
        newValue={newCode}
        splitView={true}
        renderContent={this.highlightSyntax}
      />
    );
  };
}

Text block diff comparison

Different styles of text block diffing are possible by using the enums corresponding to variou JsDiff methods (learn more). The supported methods are as follows.

enum DiffMethod {
  CHARS = 'diffChars',
  WORDS = 'diffWords',
  WORDS_WITH_SPACE = 'diffWordsWithSpace',
  LINES = 'diffLines',
  TRIMMED_LINES = 'diffTrimmedLines',
  SENTENCES = 'diffSentences',
  CSS = 'diffCss',
}

import React, { PureComponent } from 'react';
import ReactDiffViewer, { DiffMethod } from 'react-diff-viewer';

const oldCode = `
{
  "name": "Original name",
  "description": null
}
`;
const newCode = `
{
  "name": "My updated name",
  "description": "Brand new description",
  "status": "running"
}
`;

class Diff extends PureComponent {
  render = () => {
    return (
      <ReactDiffViewer
        oldValue={oldCode}
        newValue={newCode}
        compareMethod={DiffMethod.WORDS}
        splitView={true}
      />
    );
  };
}

Overriding Styles

React Diff Viewer uses emotion for styling. It also offers a simple way to override styles and style variables. You can supply different variables for both light and dark themes. Styles will be common for both themes.

Below are the default style variables and style object keys.

// Default variables and style keys

const defaultStyles = {
  variables: {
    light: {
      diffViewerBackground: '#fff',
      diffViewerColor: '#212529',
      addedBackground: '#e6ffed',
      addedColor: '#24292e',
      removedBackground: '#ffeef0',
      removedColor: '#24292e',
      wordAddedBackground: '#acf2bd',
      wordRemovedBackground: '#fdb8c0',
      addedGutterBackground: '#cdffd8',
      removedGutterBackground: '#ffdce0',
      gutterBackground: '#f7f7f7',
      gutterBackgroundDark: '#f3f1f1',
      highlightBackground: '#fffbdd',
      highlightGutterBackground: '#fff5b1',
      codeFoldGutterBackground: '#dbedff',
      codeFoldBackground: '#f1f8ff',
      emptyLineBackground: '#fafbfc',
      gutterColor: '#212529',
      addedGutterColor: '#212529',
      removedGutterColor: '#212529',
      codeFoldContentColor: '#212529',
      diffViewerTitleBackground: '#fafbfc',
      diffViewerTitleColor: '#212529',
      diffViewerTitleBorderColor: '#eee',
    },
    dark: {
      diffViewerBackground: '#2e303c',
      diffViewerColor: '#FFF',
      addedBackground: '#044B53',
      addedColor: 'white',
      removedBackground: '#632F34',
      removedColor: 'white',
      wordAddedBackground: '#055d67',
      wordRemovedBackground: '#7d383f',
      addedGutterBackground: '#034148',
      removedGutterBackground: '#632b30',
      gutterBackground: '#2c2f3a',
      gutterBackgroundDark: '#262933',
      highlightBackground: '#2a3967',
      highlightGutterBackground: '#2d4077',
      codeFoldGutterBackground: '#21232b',
      codeFoldBackground: '#262831',
      emptyLineBackground: '#363946',
      gutterColor: '#464c67',
      addedGutterColor: '#8c8c8c',
      removedGutterColor: '#8c8c8c',
      codeFoldContentColor: '#555a7b',
      diffViewerTitleBackground: '#2f323e',
      diffViewerTitleColor: '#555a7b',
      diffViewerTitleBorderColor: '#353846',
    }
  },
  diffContainer?: {}, // style object
  diffRemoved?: {}, // style object
  diffAdded?: {}, // style object
  marker?: {}, // style object
  emptyGutter?: {}, // style object
  highlightedLine?: {}, // style object
  lineNumber?: {}, // style object
  highlightedGutter?: {}, // style object
  contentText?: {}, // style object
  gutter?: {}, // style object
  line?: {}, // style object
  wordDiff?: {}, // style object
  wordAdded?: {}, // style object
  wordRemoved?: {}, // style object
  codeFoldGutter?: {}, // style object
  codeFold?: {}, // style object
  emptyLine?: {}, // style object
  content?: {}, // style object
  titleBlock?: {}, // style object
  splitView?: {}, // style object
}

To override any style, just pass the new style object to the styles prop. New style will be computed using Object.assign(default, override).

For keys other than variables, the value can either be an object or string interpolation.

import React, { PureComponent } from 'react';
import ReactDiffViewer from 'react-diff-viewer';

const oldCode = `
const a = 10
const b = 10
const c = () => console.log('foo')

if(a > 10) {
  console.log('bar')
}

console.log('done')
`;
const newCode = `
const a = 10
const boo = 10

if(a === 10) {
  console.log('bar')
}
`;

class Diff extends PureComponent {
  highlightSyntax = str => (
    <span
      style={{ display: 'inline' }}
      dangerouslySetInnerHTML={{
        __html: Prism.highlight(str, Prism.languages.javascript),
      }}
    />
  );

  render = () => {
    const newStyles = {
      variables: {
        dark: {
          highlightBackground: '#fefed5',
          highlightGutterBackground: '#ffcd3c',
        },
      },
      line: {
        padding: '10px 2px',
        '&:hover': {
          background: '#a26ea1',
        },
      },
    };

    return (
      <ReactDiffViewer
        styles={newStyles}
        oldValue={oldCode}
        newValue={newCode}
        splitView={true}
        renderContent={this.highlightSyntax}
      />
    );
  };
}

Local Development

yarn install
yarn build # or use yarn build:watch
yarn start:examples

Check package.json for more build scripts.

License

MIT