@wry/context
Advanced tools
Package description
The @wry/context npm package provides a mechanism for managing contextual information across asynchronous operations without relying on global state or directly passing context through function calls. It's particularly useful for tracking execution contexts across async boundaries, making it easier to implement features like request-scoped logging, performance monitoring, and more in a way that's transparent to the code that's being executed.
Creating and using a context
This feature demonstrates how to create a new context and use it to store and retrieve values within a specific execution scope. The `withValue` method temporarily sets a value for a given key in the context, which can be accessed using the `get` method within the callback passed to `withValue`. Outside of this callback, the context does not hold the value, showcasing how @wry/context can manage context-specific data without leaking it outside of the intended scope.
const {Slot} = require('@wry/context');
let context = new Slot();
context.withValue('myKey', 'myValue', () => {
// Within this function, context.get('myKey') will return 'myValue'.
console.log(context.get('myKey')); // Outputs: 'myValue'
});
// Outside, context.get('myKey') returns undefined.
console.log(context.get('myKey')); // Outputs: undefinedThe cls-hooked package provides a similar functionality to @wry/context by allowing the creation of context namespaces that can be used to store and access data across asynchronous calls. It uses the async_hooks module in Node.js to achieve this. Compared to @wry/context, cls-hooked is more tightly integrated with Node.js's async model but might be more complex to use due to its reliance on async_hooks.
This package also offers context management capabilities similar to @wry/context, enabling the association of state with chains of asynchronous calls. It's an earlier solution compared to cls-hooked and might not be as efficient or reliable in certain Node.js versions or scenarios. Compared to @wry/context, continuation-local-storage provides a broader API but may suffer from the limitations of its underlying implementation.
Readme
Manage contextual information needed by synchronous or asynchronous tasks without explicitly passing objects around.
FAQs
Manage contextual information needed by (a)synchronous tasks without explicitly passing objects around
The npm package @wry/context receives a total of 2,808,690 weekly downloads. As such, @wry/context popularity was classified as popular.
We found that @wry/context demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Tea.xyz, a crypto project aimed at rewarding open source contributions, is once again facing backlash due to an influx of spam packages flooding public package registries.
Security News
As cyber threats become more autonomous, AI-powered defenses are crucial for businesses to stay ahead of attackers who can exploit software vulnerabilities at scale.
Security News
UnitedHealth Group disclosed that the ransomware attack on Change Healthcare compromised protected health information for millions in the U.S., with estimated costs to the company expected to reach $1 billion.