Question 1

How to use injection-js with React?

Accepted Answer

You can integrate injection-js directly into React components or use libraries like @martin_hotell/rea-di, which provides hierarchical injection for React. The README shows examples with vanilla JS and TypeScript, but for React, you might need to wrap providers or use context alongside injection-js.

Question 2

Does injection-js work with TypeScript without Angular?

Accepted Answer

Yes, injection-js fully supports TypeScript, as shown in the README with examples using decorators and the inject function. You need to enable experimentalDecorators and emitDecoratorMetadata in tsconfig.json and add a Reflect polyfill like reflect-metadata.

Question 3

What is the performance impact of injection-js?

Accepted Answer

Injection-js is lightweight at 5.2KB, but the reflection-based injection can add runtime overhead compared to compile-time solutions. However, it's optimized from Angular's DI and generally fast for most use cases, though heavy dynamic injection might slow things down.

Question 4

Can I use injection-js in a Node.js backend?

Accepted Answer

Absolutely, injection-js is designed for Node.js environments, as highlighted in the README. It provides dependency injection for server-side applications, similar to how Angular uses DI, making it suitable for modular backend code.

Question 5

Injection-js vs InversifyJS: which is better?

Accepted Answer

Injection-js is based on Angular's mature DI and is lighter (5.2KB vs InversifyJS's larger size), but InversifyJS offers more features like middleware and a richer ecosystem. Choose injection-js for Angular-like simplicity and reliability; pick InversifyJS for more advanced DI patterns and tooling.

Question 6

Is injection-js suitable for large-scale applications?

Accepted Answer

Yes, due to its Angular heritage, injection-js scales well with hierarchical injectors and modular design. However, the reflection dependency and potential setup complexity might require careful planning in very large teams or performance-critical systems.

injection-js

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