code: function (packagePath, semverIndex)
  	{
  		// Check if package file exists
  		if ( !fs.existsSync(packagePath) )
  		{
  			throw new Error(`Package file ${packagePath} is not found.`, 1);
  		}
  
  		// Read package file content
  		const packageData = JSON.parse( fs.readFileSync( packagePath ) );
  
  		// Increment version according to semver increment index
  		packageData.version = module.exports.semverIncrement(packageData.version, semverIndex);
  
  		// Write new package.json
  		fs.writeFileSync(packagePath, JSON.stringify( packageData, null, 2));
  
  		// Return incremented version
  		return packageData.version;
  	}
docs: Increment any package.json version.