Introduction to fs-monkey

fs-monkey is a powerful library designed to extend the functionality of Node.js’ built-in fs module. It offers a plethora of APIs that simplify file system interactions, make your code more efficient, and help you manage files and directories with ease.

Useful API Explanations with Code Snippets

1. Patching the Native fs Module

One of the fundamental features of fs-monkey is its ability to patch the native fs module:

  const { patchFs } = require('fs-monkey');
  const fs = require('fs');

  patchFs(fs);
  console.log(fs.promises.readFile); // Now supports promises!

2. Creating a Virtual File System

You can create a virtual file system in memory, making it easy to test file operations:

  const { patchFs, vol } = require('fs-monkey');
  const fs = require('fs');

  vol.fromJSON({
    '/test/file.txt': 'Hello, fs-monkey!'
  });

  patchFs(fs);
  fs.readFile('/test/file.txt', 'utf8', (err, data) => {
    console.log(data); // Output: Hello, fs-monkey!
  });

3. Creating Files and Directories Dynamically

Creating files and directories has never been easier:

  const { vol } = require('fs-monkey');
  const fs = require('fs');

  vol.mkdirpSync('/new/path/to/dir');
  vol.writeFileSync('/new/path/to/dir/file.txt', 'Content inside file');

  fs.readFile('/new/path/to/dir/file.txt', 'utf8', (err, data) => {
    console.log(data); // Output: Content inside file
  });

4. Read and Write JSON Files

Operate directly on JSON files for easy configuration management:

  const { vol, patchFs } = require('fs-monkey');
  const fs = require('fs');

  vol.fromJSON({});
  patchFs(fs);

  const config = { name: 'fs-monkey', version: '1.0.0' };
  fs.writeFileSync('/config.json', JSON.stringify(config));

  fs.readFile('/config.json', 'utf8', (err, data) => {
    const parsedData = JSON.parse(data);
    console.log(parsedData.name); // Output: fs-monkey
  });

Example Application Using fs-monkey

Here’s a simple application demonstrating how to utilize various APIs of fs-monkey effectively:

  const { patchFs, vol } = require('fs-monkey');
  const fs = require('fs');

  // Create a virtual file system
  vol.fromJSON({
    '/app/data.json': '{"items": ["item1", "item2", "item3"]}'
  });

  patchFs(fs);

  // Create new directory and file
  vol.mkdirpSync('/app/output');
  fs.writeFileSync('/app/output/log.txt', 'Starting the app');

  // Reading and updating a JSON file
  fs.readFile('/app/data.json', 'utf8', (err, data) => {
    if (err) throw err;

    const jsonData = JSON.parse(data);
    jsonData.items.push('item4');
    fs.writeFile('/app/data.json', JSON.stringify(jsonData), (err) => {
      if (err) throw err;

      console.log('Updated data:', jsonData);
    });
  });

  // Logging operation status
  fs.appendFile('/app/output/log.txt', '\nApp finished running', (err) => {
    if (err) throw err;
    console.log('Log updated');
  });

With fs-monkey, managing your file operations in Node.js becomes much more straightforward and efficient. Happy coding!

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