Effect is a powerful library for TypeScript developers that brings functional programming techniques into managing effects and errors. It aims to be a

Exploring Effect in TypeScript: Simplifying Async and Error Handling - Tweag

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2024-11-07 12:30:01

Effect is a powerful library for TypeScript developers that brings functional programming techniques into managing effects and errors. It aims to be a comprehensive utility library for TypeScript, offering a range of tools that could potentially replace specialized libraries like Lodash, Zod, Immer, or RxJS.

In this blog post, we will introduce you to Effect by creating a simple weather widget app. This app will allow users to search for weather information by city name, making it a good example as it involves API data fetching, user input handling, and error management. We will implement this project in both vanilla TypeScript and using Effect to demonstrate the advantages Effect brings in terms of code readability and maintainability.

Effect promises to improve TypeScript code by providing a set of modules and functions that are composable with maximum type-safety. The term “effect” refers to an effect system, which provides a declarative approach to handling side effects. Side effects are operations that have observable consequences in the real world, like logging, network requests, database operations, etc. The library revolves around the Effect<Success, Error, Requirements> type, which can be used to represent an immutable value that lazily describes a workflow or job. Effects are not functions by themselves, they are descriptions of what should be done. They can be composed with other effects, and they can be interpreted by the Effect runtime system. Before we dive into the project we will build, let’s look at some basic concepts of Effect.

To create an effect based on a function, we can use the Effect.sync and Effect.promise for synchronous and asynchronous functions that can’t fail, respectively, and Effect.try and Effect.tryPromise for synchronous and asynchronous functions that can fail.

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