Introduction to fs-tree-diff

The fs-tree-diff library is a powerful tool for developers seeking to effectively compare and synchronize file system trees. This comprehensive guide will walk you through various APIs provided by fs-tree-diff with practical code examples and an app illustration, optimizing your development process.

APIs and Code Snippets

Tree Class

The Tree class serves as the core representation of the file system tree. Create a new tree and visualize its structure:

  const { Tree } = require('fs-tree-diff');

  let tree = new Tree({
    'file1.txt': 'Hello, World!',
    'dir1': {
      'file2.txt': 'Hello, fs-tree-diff!'
    }
  });

  console.log(tree);

diffTree Method

To compare two file trees, use the diffTree method:

  const { diffTree } = require('fs-tree-diff');

  let oldTree = new Tree({
    'file1.txt': 'Hello, World!',
    'dir1': {
      'file2.txt': 'Hello, fs-tree-diff!'
    }
  });

  let newTree = new Tree({
    'file1.txt': 'Hello, Universe!',
    'dir2': {
      'file3.txt': 'Hello, Again!'
    }
  });

  let changes = diffTree(oldTree, newTree);

  console.log(changes);

applyPatch Method

To apply changes identified from diffTree to a file system, use applyPatch:

  const { applyPatch } = require('fs-tree-diff');

  let changes = diffTree(oldTree, newTree);

  applyPatch(oldTree, changes);

  console.log(oldTree);

Example Application

Let’s create a simple app that uses these APIs to sync a source tree to a destination tree.

  const { Tree, diffTree, applyPatch } = require('fs-tree-diff');

  let sourceTree = new Tree({
    'file1.txt': 'Hello, World!',
    'dir1': {
      'file2.txt': 'Hello, fs-tree-diff!'
    }
  });

  let destinationTree = new Tree({
    'file1.txt': 'Hello, Universe!',
    'dir2': {
      'file3.txt': 'Hello, Again!'
    }
  });

  let changes = diffTree(destinationTree, sourceTree); // Find changes from source to destination

  applyPatch(destinationTree, changes); // Sync destination to match source

  console.log(destinationTree);

By following this guide and utilizing the fs-tree-diff library, you can efficiently manage file system synchronization and comparison in your applications.

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