Exploring the capabilities of google-diff-match-patch within the Angular framework

Seeking a way to incorporate the google diff/match/patch lib into an Angular application for displaying the variance between two texts.

Here's how I plan on using it:

public ContentHtml: SafeHtml;
compare(text1: string, text2: string):void {
    var dmp = new diff_match_patch();

    dmp.Diff_Timeout = 1;
    dmp.Diff_EditCost = 4;

    var d = dmp.diff_main(text1, text2);
    dmp.diff_cleanupSemantic(d);
    var ds = dmp.diff_prettyHtml(d);

    this.ContentHtml = this._sanitizer.bypassSecurityTrustHtml(ds);
}

The issue lies in importing diff_match_patch for this particular line:

var dmp = new diff_match_patch();

Answer №1

To incorporate the npm package into your Angular project, you must first add it to the package.json file.

"diff-match-patch": "^1.0.5",

Next, import it into the component like so:

import { Component } from '@angular/core';
import DiffMatchPatch from 'diff-match-patch';
@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  name = 'Angular';

  getDiff() {
    var dmp = new DiffMatchPatch();
    var diff = dmp.diff_main('Hello', 'Hallo');
    // Output: [(-1, "Hell"), (1, "G"), (0, "o"), (1, "odbye"), (0, " World.")]
    dmp.diff_cleanupSemantic(diff);
    // Output: [(-1, "Hello"), (1, "Goodbye"), (0, " World.")]
    console.log(diff);
  }

}

Explore a live demo here

Answer №2

Expanding on @Shashank's response -- for enhanced type safety, you can also download the appropriate type definitions by executing:

npm i -D @types/diff-match-patch
or 
yarn add -D @types/diff-match-patch

The type definitions have remained relatively unchanged since 2017, preventing you from utilizing

import DiffMatchPatch from 'diff-match-patch';

as there is no default export — solely exporting the somewhat oddly named diff_match_patch class (resembling a function) -- which was your initial attempt!

Nevertheless, TypeScript facilitates import aliasing, allowing you to import the familiar instantiable class:

import { diff_match_patch as DiffMatchPatch } from 'diff-match-patch';

Upon successful importation, you will gain access to intelligent code suggestions and more:

https://i.sstatic.net/zpGCo.png

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