diffs the labymod launcher code (very basic, not the best but i wanted it quick)

laby_differ.mjs

import fs from "node:fs";
import { compare } from "dir-compare";

const path1 = "apps/app-1.0.15";
const path2 = "apps/app-1.0.16";
const options = { compareSize: true };

compare(path1, path2, options)
    .then(res => {
        for (let diff of res.diffSet)
            if (diff.reason) {
                console.log(`${diff.path1}/${diff.name1}`, `${diff.path2}/${diff.name2}`);
                const diffing = compareFiles(`${diff.path1}/${diff.name1}`, `${diff.path2}/${diff.name2}`);
                fs.writeFileSync(`diff/${diff.name1}.json`, JSON.stringify(diffing, null, 2), "utf-8");
            }
    })
    .catch(error => console.error(error));

function compareFiles(file1, file2) {
    const content1 = fs.readFileSync(file1, "utf-8");
    const content2 = fs.readFileSync(file2, "utf-8");

    const lines1 = content1.split("\n");
    const lines2 = content2.split("\n");

    const diff = [];

    lines1.forEach((line, index) => {
        if (line !== lines2[index]) {
            const diffLine = {
                line: index + 1,
                content1: "",
                content2: ""
            };

            const diffIndices = getDiffIndices(line, lines2[index]);

            if (diffIndices.length > 0) {
                let minIndex = diffIndices[0];
                let maxIndex = diffIndices[0];

                for (let i = 1; i < diffIndices.length; i++) {
                    minIndex = Math.min(minIndex, diffIndices[i]);
                    maxIndex = Math.max(maxIndex, diffIndices[i]);
                }

                const startIndex = Math.max(minIndex - 5, 0);
                const endIndex = Math.min(maxIndex + 5, line.length);

                diffLine.content1 = line.substring(startIndex, endIndex);
                diffLine.content2 = lines2[index].substring(startIndex, endIndex);
            }

            diff.push(diffLine);
        }
    });

    return diff;
}

function getDiffIndices(str1, str2) {
    const indices = [];

    for (let i = 0; i < str1.length; i++)
        if (str1[i] !== str2[i])
            indices.push(i);

    return indices;
}