Скачать или смотреть How to List All Installed Versions of an NPM Package Using Yarn API

Discover a simple method to programmatically enumerate all installed versions of an API client package using the Yarn API — ensuring compatibility between your backend and frontend deployment.
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How to List All Installed Versions of an NPM Package Using Yarn API

In the fast-paced world of software development, managing dependencies is crucial to ensuring that your applications run smoothly and are compatible with each other. When working with JavaScript applications that utilize both a backend and an API client, ensuring that your versions align can be a daunting task. This becomes even more complicated when your application structure involves multiple libraries that depend on the same client. If you're facing the challenge of potentially having two different versions of your API client package linked, you're not alone.

The Challenge

Imagine a scenario where your backend interface is wrapped in an npm package, which your application (client) imports. The versioning between these two components is linked; the backend generally must be at a higher version number than the client package for safe deployment. However, as you extend your application and introduce multiple domain libraries, each relying on the API client, checking those dependencies can quickly spiral into a big headache.

You might consider using peer dependencies to manage this dilemma. However, peer dependencies only provide warnings, not errors, when mismatches occur, which can lead to situations where you're using incompatible versions without even knowing it.

To combat this issue, you thought about enumerating all installed versions of your API client package in a pre-deployment check and verifying each against the backend version. This leads to a pressing question: How can you effectively use the Yarn API to list all installed versions of a package?

The Solution

Directly Reading yarn.lock

After exploring the Yarn API, it might seem quite complex to navigate, especially when you're running into issues with configurations and plugin recognition. A simpler and more efficient approach can be to read the yarn.lock file directly. This file is structured in YAML format, making it far easier to extract the necessary dependency information.

Implementation

Here’s how you can implement a function to retrieve all the installed versions of a specified npm package using the yarn.lock file:

Step 1: Import Required Libraries

You'll need js-yaml to handle YAML parsing and fs for file operations.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Define the Function

Create an asynchronous function that reads the yarn.lock file and processes it to filter out the necessary versions of your specified package.

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Reading the File: The first line reads yarn.lock asynchronously and returns its content as a string.

Parsing the YAML: The yaml.load function parses this YAML string into a JavaScript object that can be easily manipulated.

Filtering Installed Versions: The code filters the entries for those that have a resolution starting with the specified package name, retrieving those versions.

Output: Finally, the function returns an array of all matching versions.

Benefits of This Approach

Simplicity: Directly handling the yarn.lock file is more straightforward than working with the Yarn API, especially when you've encountered configuration issues.

Efficiency: This method does not spawn unnecessary processes, maintaining optimal application performance.

Reliability: By directly querying the yarn.lock, you are guaranteed to get accurate results concerning the versions installed.

Conclusion

Maintaining alignment between backend and client versions is paramount in JavaScript applications. By leveraging the yarn.lock file, you can effectively enumerate all installed