@hackler/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

Prop	Type	Default	Description
oldValue	string	''	Old value as string.
newValue	string	''	New value as string.
splitView	boolean	true	Switch between unified and split view.
disableWordDiff	boolean	false	Show and hide word diff in a diff line.
compareMethod	DiffMethod	DiffMethod.CHARS	JsDiff text diff method used for diffing strings. Check out the guide to use different methods.
hideLineNumbers	boolean	false	Show and hide line numbers.
renderContent	function	undefined	Render Prop API to render code in the diff viewer. Helpful for syntax highlighting
onLineNumberClick	function	undefined	Event handler for line number click. (lineId: string) => void
highlightLines	array[string]	[]	List of lines to be highlighted. Works together with onLineNumberClick. Line number are prefixed with L and R for the left and right section of the diff viewer, respectively. For example, L-20 means 20th line in the left pane. To highlight a range of line numbers, pass the prefixed line number as an array. For example, [L-2, L-3, L-4, L-5] will highlight the lines 2-5 in the left pane.
showDiffOnly	boolean	true	Shows only the diffed lines and folds the unchanged lines
extraLinesSurroundingDiff	number	3	Number of extra unchanged lines surrounding the diff. Works along with showDiffOnly.
codeFoldMessageRenderer	function	Expand {number} of lines ...	Render Prop API to render code fold message.
classes	object	{}	To override styles. Learn more about overriding styles
leftTitle	string	undefined	Column title for left section of the diff in split view. This will be used as the only title in inline view.
rightTitle	string	undefined	Column title for right section of the diff in split view. This will be ignored in inline view.
linesOffset	number	0	Number to start count code lines from.

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';
import 'react-diff-viewer/lib/light.css';

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 css for styling. It also offers a simple way to override styles. You can supply different class names.

Below are the default class object keys.

// Default style keys

const defaultClasses = {
  diffContainer?: 'react-diff-viewer',
  diffRemoved?: 'react-diff-viewer__line-cell--diff-removed',
  diffAdded?: 'react-diff-viewer__line-cell--diff-added',
  marker?: 'react-diff-viewer__marker',
  emptyGutter?: 'react-diff-viewer__gutter--empty',
  highlightedLine?: 'react-diff-viewer__line-cell--highlight',
  lineNumber?: 'react-diff-viewer__line-number',
  highlightedGutter?: 'react-diff-viewer__gutter--highlight',
  contentText?: 'react-diff-viewer__content-text',
  gutter?: 'react-diff-viewer__gutter',
  line?: 'react-diff-viewer__line',
  wordDiff?: 'react-diff-viewer__word-diff',
  wordAdded?: 'react-diff-viewer__word-diff--word-added',
  wordRemoved?: 'react-diff-viewer__word-diff--word-removed',
  codeFoldGutter?: 'react-diff-viewer__code-fold-gutter',
  codeFold?: 'react-diff-viewer__code-fold',
  emptyLine?: 'react-diff-viewer__line-cell--empty',
  content?: 'react-diff-viewer__content',
  titleBlock?: 'react-diff-viewer__title-block',
  splitView?: 'react-diff-viewer--split-view',
}

To override any style, just pass the class names to the classes prop.

/* styles.css */
.diff-viewer__line {
  padding: 10px 2px;
}

.diff-viewer__line:hover {
  background: #a26ea1;
}

import React, { PureComponent } from 'react';
import ReactDiffViewer from 'react-diff-viewer';
import './styles.css'

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 classes = {
      line: 'diff-viewer__line',
    };

    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