brandi

The dependency injection container.

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🥃 Brandi

Brandi is a dependency injection container powered by TypeScript.

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  • Framework agnostic. Can work with any UI or server framework.
  • Lightweight and Effective. It is tiny and designed for maximum performance.
  • Strongly typed. TypeScript support out of box.
  • Decorators free. Does not require additional parameters in tsconfig.json and Reflect polyfill.

Installation

Brandi is available as a package for use with a module bundler or in a Node application.

# NPM
npm install brandi
# Yarn
yarn add brandi

The Brandi source code is written in TypeScript but we precompile both CommonJS and ESModule builds to ES2018.

Additionally, we provide builds precompiled to ESNext by esnext, esnext:main and esnext:module fields.

TypeScript

TypeScript type definitions are included in the library and do not need to be installed additionally.

No Dependencies

Brandi has no dependencies, but requires the following globals in order to work:

  • Symbol
  • WeakMap

Production

By default, Brandi will be in development mode. The development mode includes warnings about common mistakes and capture()/resotre() Container methods.

Don't forget to set process.env.NODE_ENV to production when deploying your application.

Documentation

You can find the Brandi documentation on the website.

The documentation is divided into several sections:

Examples

Here are just basic examples.

Getting Instance

Binding types and scopes are detailed in Binding Types and Binding Scopes sections of the documentation.

import { Container, token } from 'brandi';

class ApiService {}

const TOKENS = {
  /*          ↓ Creates a typed token. */
  apiService: token<ApiService>('apiService'),
};

const container = new Container();

container
  .bind(TOKENS.apiService)
  .toInstance(ApiService) /* ← Binds the token to an instance */
  .inTransientScope(); /*    ← in transient scope. */

/*                           ↓ Gets the instance from the container. */
const apiService = container.get(TOKENS.apiService);

expect(apiService).toBeInstanceOf(ApiService);

Snapshoting

import { Container, token } from 'brandi';

const TOKENS = {
  apiKey: token<string>('API Key'),
};

const container = new Container();

container
  .bind(TOKENS.apiKey)
  .toConstant('#key9428'); /* ← Binds the token to some string. */

/*        ↓ Captures (snapshots) the current container state. */
container.capture();

container
  .bind(TOKENS.apiKey)
  .toConstant('#testKey'); /* ← Binds the same token to another value. */
                           /*   For example, this can be used in testing. */

const testKey = container.get(TOKENS.apiKey);

/*        ↓ Restores the captured container state. */
container.restore();

const originalKey = container.get(TOKENS.apiKey);

expect(testKey).toBe('#testKey');
expect(originalKey).toBe('#key9428');

Other Container methods are detailed in Container section of the documentation.

Hierarchical Containers

Hierarchical containers are detailed in Hierarchical Containers section of the documentation.

import { Container, token } from 'brandi';

class ApiService {}

const TOKENS = {
  apiService: token<ApiService>('apiService'),
};

const parentContainer = new Container();

parentContainer
  .bind(TOKENS.apiService)
  .toInstance(ApiService)
  .inTransientScope();

/*                     ↓ Creates a container with the parent. */
const childContainer = new Container().extend(parentContainer);

/**                ↓ That container can't satisfy the getting request,
 *                   it passes it along to its parent container.
 *                   The intsance will be gotten from the parent container.
 */
const apiService = childContainer.get(TOKENS.apiService);

expect(apiService).toBeInstanceOf(ApiService);

If you find any bugs or have a feature request, please open an issue on github!

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