npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@finnair/diff

v7.0.0-alpha.9

Published

Object Diff Based on Paths And Valudes of an Object

Downloads

155

Readme

CI codecov npm version

Diff & VersionInfo

@finnair/diff library offers paths and values (Map<Path, any>) based configurable object difference utility. Use Diff class to analyze differences of two objects, or Versioninfo to compare and transform two versions of the same object.

Diff supports only primitive, array and plain object values.

JSON serialization of VersionInfo offers nice representation of the new version (current) with changedPaths and configurable set of old values (previous). Old values are useful for example in cases where natural identifier of an object changes and the old identifier is needed for targeting an update. VersionInfo is great for change based triggers configurable by a PathMatcher.

Getting Started

Install v-validation using yarn:

yarn add @finnair/diff

Or npm:

npm install @finnair/diff

Features

Changeset

Diff.changeset<T>(a:T, b: T) analyzes changes between a and b and returns a Map<string, Change> of changed paths to Change objects. A Change object contains a path (as Path), oldValue and newValue. Changeset can be used to patch/revert changes with Path.set:

const diff = new Diff();
const a = {...};
const b = {...};
// patch a into b - for revert, use set change.oldValue
diff.changeset(a, b).forEach((change) => change.path.set(a, change.newValue));

Change Triggering

VersionInfo.matches and matchesAny can be used to trigger functionality based on what has changed. Use PathMatcher to specify paths of interest.

Filtering

Diff has a configurable filter that can be used to include/exclude properties/values. This can be used to for example exclude metadata fields from changeset. The default filter excludes undefined values.

Mapping/Transforming

VersionInfo supports both sync and async transformations. Both old and new values are transformed and the resulting VersionInfo reflects the changes of transformed objects. This helps in conversions from internal to external model.

Nice JSON

VersionInfo is designed to be serialized as JSON. It contains the current value, changedPaths and configurable old values as previous. Only matching previous values are included and only if they have changed.