What is the purpose of npm-lock.json file

As mentioned at https://docs.npmjs.com/files/package-lock.json

package-lock.json is automatically generated for any operations where npm modifies either the node_modules tree, or package.json. It describes the exact tree that was generated, such that subsequent installs are able to generate identical trees, regardless of intermediate dependency updates.
This file is intended to be committed into source repositories, and serves various purposes:
  • Describe a single representation of a dependency tree such that teammates, deployments, and continuous integration are guaranteed to install exactly the same dependencies.
  • Provide a facility for users to “time-travel” to previous states of node_modules without having to commit the directory itself.
  • To facilitate greater visibility of tree changes through readable source control diffs.
  • And optimize the installation process by allowing npm to skip repeated metadata resolutions for previously-installed packages.
One key detail about package-lock.json is that it cannot be published, and it will be ignored if found in any place other than the toplevel package. 

Comments

Post a Comment

Popular posts from this blog

What test framework did you use to test your nodejs applications

1) Mocha - Mocha is a feature-rich JavaScript test framework running on  Node.js  and in the browser, making asynchronous testing  simple  and  fun .  Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases Simple Usage - $ npm install mocha $ mkdir test $ $EDITOR test/test.js # or open with your favorite editor In your editor: var assert = require ( 'assert' ) ; describe ( 'Array' , function ( ) { describe ( '#indexOf()' , function ( ) { it ( 'should return -1 when the value is not present' , function ( ) { assert . equal ( [ 1 , 2 , 3 ] . indexOf ( 4 ) , - 1 ) ; } ) ; } ) ; } ) ; Back in the terminal: $ ./node_modules/mocha/bin/mocha Array #indexOf() ✓ should return -1 when the value is not present 1 passing (9ms) Set up a test script in package.json: "scripts" : { "test" : "m...
Read more

What is V8 Engine? What is the relationship between Node.js and V8?

  V8 Engine is Google’s open source javascript and written in C++ and used inside Google Chrome. It was designed for increasing the performance of JavaScript execution inside web browsers. V8 is the Javascript engine inside of node.js that parses and runs your Javascript. The same V8 engine is used inside of Chrome to run javascript in the Chrome browser. Google open-sourced the V8 engine and the builders of node.js used it to run Javascript in node.js.
Read more