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what does package lock json do

what does package lock json do

what does package lock json do插图

What is package-lock JSON?

The package-lock.json has room for that as well, and you can use the –save-dev option. Having a file listing all the dependencies allows you to easily port your code from a machine to another. Now that we know what is package-lock.json, we can look at an example one. As you can guess by the name, it is a JSON file.

What is the package-lock file?

The package-lock.json file will be generated automatically for any operations where npm modifies either the node_modules tree, or package.json. it will describe the exact tree that is was generated, such that subsequent installs will be able to generate identical trees, irrespective of intermediate dependency updates.

Why does my package lock JSON change when I run NPM install?

The reason package-lock.jsonmay change automatically when you run npm installis because NPM is updating the package-lock.jsonfile to accurately reflect all the dependencies it has downloaded since it may have gotten more up-to-date versions of some of them.

How many dependencies does a package-lock file have?

Since a real package-lock.json file can be very long, we omit much of it. In this example, the file has just two dependencies, the abbrev and accepts packages. Respectively, we need them in version 1.1.1 and 1.3.5.

Why does npm use a hidden lockfile?

In order to avoid processing the node_modules folder repeatedly, npm as of v7 uses a "hidden" lockfile present in node_modules/.package-lock.json. This contains information about the tree, and is used in lieu of reading the entire node_modules hierarchy provided that the following conditions are met:

What is 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.

What happens if another CLI mutates the tree?

If another CLI mutates the tree in any way, this will be detected, and the hidden lockfile will be ignored.

What is lockfiles in npm?

As of npm v7, lockfiles include enough information to gain a complete picture of the package tree, reducing the need to read package.json files, and allowing for significant performance improvements.

When npm detects a lockfile from npm v6 or before during the package installation process?

When npm detects a lockfile from npm v6 or before during the package installation process, it is automatically updated to fetch missing information from either the node_modules tree or (in the case of empty node_modules trees or very old lockfile formats) the npm registry.

What is a resolved npmjs?

resolved: The place where the package was actually resolved from. In the case of packages fetched from the registry, this will be a url to a tarball. In the case of git dependencies, this will be the full git url with commit sha. In the case of link dependencies, this will be the location of the link target. registry.npmjs.org is a magic value meaning "the currently configured registry".

What is registry.npmjs.org?

registry.npmjs.org is a magic value meaning "the currently configured registry".

Why do we need lock files?

Lock files are intended to pin down, or lock, all versions for the entire dependency tree at the time that the lock file is created. Why is it important to use a package lock file and lock package versions?

How do lock files work?

There are two package lock files that can be identified for the majority of the npm ecosystem:

What is package lock in npm?

Package lock files serve as a rich manifest of dependencies for projects that specify the exact version of dependencies to be installed, as well as the dependencies of those dependencies, and so on—to encompass the full dependency tree.

Why is it bad to lock files in libraries?

The main argument against having lock files in libraries is that it will cause disparity in the dependencies that consumers actually pull with the library. Due to this disparity, package maintainers will not catch breaking builds.

What is a lock file?

Lock files are introduced when developers interact with a project, such as adding a dependency or installing dependencies for a pristine project clone. It is common practice for developers to add or remove dependencies from a project during the development cycle, but what happens if they make a change in package.json and forget to commit …

What happens when a package.json is not in sync?

When a project’s package.json is not in-sync with its lock file, package managers like npm and yarn will try to reconcile the difference and generate a new manifest. While this sounds like a good thing, it is actually a recipe for issues if it happens during CI.

Why use a flow in a library?

This flow allows you to maintain reproducible builds and consistent dependencies for development workflow, and at the same time enables developers to catch any potentially breaking changes for your library consumers —and all of this, while also keeping all of the developers on your team happy.

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Have you ever worked with Javascript? If you did, maybe you came across package-lock.json. What is package-lock JSON file? Why it is important? In this post, we address these questions, to better understand how to manage a Javascript project.

Not all projects have a package-lock.json

The truth is that this file is not present in all javascript projects. In fact, you may be writing JS code just fine without it. That’s often the case when you simply write inside a static page with <script> tags. However, that was the approach to javascript of early 2000.

What is package-lock.json?

Now that the preface is over we can get to the interesting part. What is package lock json file? In short, it is a file listing the full dependency tree of your project. What is the dependency tree? That’s even simpler. As said before, your project will depend on some packages, and you can find them in the package-lock.json.

In Conclusion

In short, you will rarely have to edit a package-lock.json file manually. Nonetheless, it is important to understand what package lock json is, and why it is important. This will allow you to develop applications in a more predictable way. Let me know what you think of using the package-lock.json file in the comments.

What is package lock.json?

NPM version 5 introduced package-lock.json as a mechanism to capture the exact dependency tree installed at any point in time.

What is install used for?

install can be used with the names of modules to install as arguments, which will alter both package.json and package- lock.json since the dependency tree will change.

What does altering package lock.json mean?

For example, if someone manually alters package.json — say, for example, they remove a package since it’s just a matter of removing a single line — the next time that someone runs npm install, it will alter package-lock.json to reflect the removal of the previous package.

What does update do in package.json?

update will read package.json to find any dependencies that can be updated. Subsequently, it will construct a new dependency tree and update the package-lock.json as well.

When to use npm CI?

Use npm ci everywhere when you only want the local dependencies tree — even on your local development environment. Make a repetitive task, say once a month, to update your dependencies. (Alternatively, you can use a service like dependabot, but make sure that you have a good test coverage).

What is LogRocket log?

In addition to logging Redux actions and state, LogRocket records console logs, JavaScript errors, stacktraces, network requests/responses with headers + bodies, browser metadata, and custom logs. It also instruments the DOM to record the HTML and CSS on the page, recreating pixel-perfect videos of even the most complex single-page apps.

What is LogRocket monitoring?

LogRocket is a frontend application monitoring solution that lets you replay problems as if they happened in your own browser. Instead of guessing why errors happen, or asking users for screenshots and log dumps, LogRocket lets you replay the session to quickly understand what went wrong. It works perfectly with any app, regardless of framework, and has plugins to log additional context from Redux, Vuex, and @ngrx/store.

Why does npm ciwill cause you to download the exact same packages every time?

Because npm ciwill cause you to download the exact same packages every time, it will be less likely for you to install malicious code given you have taken the necessary security precautions.

Why does NPM download a db package?

NPM downloads the `mime-db` package when installing your application’s dependencies because it’s a dependency of other dependencies.

Why does package lock.json change automatically?

The reason package-lock.jsonmay change automatically when you run npm installis because NPM is updating the package-lock.jsonfile to accurately reflect all the dependencies it has downloaded since it may have gotten more up-to-date versions of some of them . Once NPM updates the package-lock.jsonfile, others can get those exact same versions by using npm ciif they want.

How to prefix dependencies in a package.jsonfile?

When listing dependencies in your package.jsonfile, you can prefix their versions with a ^or ~. Each of these symbols will tell NPM that it doesn’t necessarily need to download the exact version you specified. Instead, it will try to download a version which is “compatible” or “equivalent” to the one in package.json.

How do evil human beings get control of other people’s NPM credentials?

Sometimes, evil human-beings will obtain control of other people’s NPM credentials and release new versions of packages by bumping the package’s patchversion number , causing millions of dependants to download the malicious piece of code.

Which is faster, npm or cicommand?

The npm cicommand runs faster than npm installbecause it doesn’t need to check what’s the latest compatible version of a package. Instead, it knows exactly which version to fetch thanks to the exhaustive dependency list in package-lock.json. In some cases, dependency installations can happen twice as fast.

Why is it bad to have different dependencies?

Having different dependencies is a problem because it can cause the application to present inconsistent behaviour across different environments, which is yet another cause for headaches when you’re trying to build reliable software. Why the same package.jsoncan cause npm installto download different dependencies.

What is 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.

What is bundled dependencies?

bundled dependencies: Regardless of source, this is a version number that is purely for informational purposes.

Is a transitive dependency a development dependency?

If true then this dependency is either a development dependency ONLY of the top level module or a transitive dependency of one. This is false for dependencies that are both a development dependency of the top level and a transitive dependency of a non-development dependency of the top level.

What does "install done with environment variable" mean?

Indicates that the install was done with the environment variable NODE_PRESERVE_SYMLINKS enabled. The installer should insist that the value of this property match that environment variable.

What happens if package-lock.json and npm-shrinkwrap.json are?

If both package-lock.json and npm-shrinkwrap.json are present in the root of a package, package-lock.json will be completely ignored.

Should all optional dependencies be included even if they’re uninstallable on the current platform?

All optional dependencies should be included even if they’re uninstallable on the current platform.

Is bundled dependencies included in source code?

For bundled dependencies this is not included, regardless of source.

What is package lock.json?

The package-lock.json file will be generated automatically for any operations where npm modifies either the node_modules tree, or package.json. it will describe the exact tree that is was generated, such that subsequent installs will be able to generate identical trees, irrespective of intermediate dependency updates.

What is dependency in a package?

A dependency is a mapping of package name to dependency object. The dependency objects have the following properties:

What is package integrity?

The packageIntegrity is a subresource integrity value created from the package.json. No preprocessing of the package.json has to be done. Subresource integrity strings may be produced by modules like ssri.

What is bundled dependencies?

bundled dependencies: Regardless of source, this option is a version number that is purely for informational purposes.

What does it mean when the installer says "install done with environment variable"?

The installer has to insist that the value of this property match that environment variable.

Is a tarball a complete URL?

For registry sources this will be path of the tarball relative to the registry URL. If the tarball URL is not on the same server as the registry URL then this is a complete URL.

Do you have to include optional dependency?

Every optional dependency has to be included even if they are uninstallable on the current platform.