npm-shrinkwrap.json

npm-shrinkwrap.json

var fs = require('fs'),
path = require('path'), 
npmShrinkwrapJson;

const NPM_SHRINKWRAP_PATH = path.join(__dirname, './npm-shrinkwrap.json'),
JSON_INDENT = '  ';
IGNORED_FIELDS = ['from', 'resolved'];

fs.readFile(NPM_SHRINKWRAP_PATH, function(err, npmShrinkwrapConent){
	if(err){
		return console.log(err);
	}
	npmShrinkwrapJson = parseJSON(npmShrinkwrapConent);
	if(!npmShrinkwrapJson){
		return console.log(`could not parse ${NPM_SHRINKWRAP_PATH} as JSON`);
	}
	searchAndRemove(npmShrinkwrapJson.dependencies);
	fs.writeFile(NPM_SHRINKWRAP_PATH+'2', JSON.stringify(npmShrinkwrapJson, null, JSON_INDENT), (err) => {
		if(err){
			return console.log(err);
		}
		console.log('done.');
	});
});

/**
* It search recursive in object, and it's children objects
* for package description type object,
* and remove keys (contained in IGNORED_FIELDS) from it.
* @param {Object} object
*/
function searchAndRemove(obj){

	if(isPackageDesc(obj)){
		removeIgnoredKeys(obj);
		if(obj.dependencies){
			searchAndRemove(obj.dependencies);
		}
	} else {
		//it's a list of dependencies
		Object.keys(obj).forEach( (dependencyName) => {
			searchAndRemove(obj[dependencyName]);
		});
	}
}

/**
* determines, if given object is 
* - package description object (true), or 
* - list of dependencies object (false)
* @param {Object} object
* @return {Boolean} result
*/
function isPackageDesc(obj){
	return (obj.version && typeof obj.version === 'string');
}

/**
* removes keys stored in IGNORED_FIELDS from given object
* @param {Object} object
*/
function removeIgnoredKeys(obj){
	IGNORED_FIELDS.forEach( (fieldNameToIgnore) => {
		if(typeof obj[fieldNameToIgnore] === 'string'){
			delete obj[fieldNameToIgnore];
		}
	});
}

/**
* parses given str into JS object
* @param {String} str
* @return {Object} JS object
*/
function parseJSON(str){
	var obj = null;
	try{
		obj = JSON.parse(str);
	}catch(err){}
	return obj;
}