react.di
Dependency injection for react based upon inversify.
Installation
npm install react.di@next reflect-metadata --save
Your tsconfig.json
needs to be configured with the following flags:
"experimentalDecorators": true,
"emitDecoratorMetadata": true
For version 1.0 see https://github.com/RobinBuschmann/react.di/tree/1.0
Getting started
1. Define injectables (values/class)
Service
;
Config
; // or Symbol('config');;
2. Inject service/value into react component
;
3. Setup module
;
Injection
Injection from class references
If you want to inject a service instance, simply mark the property with @Inject
.
The type from which the instance will be created, will be derived from the
annotated type. Notice, that the type needs to be a class. An interface won't
work, cause it will not exist on runtime anymore (See
Injection via tokens to get it work with interfaces).
userService: UserService;
A services class need to be annotated with @Injectable
otherwise it will not
be - of course - injectable.
Injection via tokens
Dependencies can also be identified by a token. This makes sense when injecting a value (for example a configuration) or if you want annotate these properties with interfaces instead of class references.
config: Config;
Multi injection
Multi injection means that all providers for a specified identifier
will be injected.
So if the annotated type of the dependency is of type Array
, the
injection will automatically processed as a multi-injection. In this
case the identifier needs to be passed explicitly:
interceptors: Interceptor;
Inject into React Components
Dependencies of react component need be injected via property injection:
;
Inject into Services
Dependencies of services will be injected via constructor injection:
;
Sharing providers
Providers can be shared via importing from siblings or inheriting them from parent components.
Importing modules in other modules
Modules can be imported in other modules to share its providers.
Hierarchical shared providers
Nesting Module
annotated components in another Module
annotated components
is supported.
All defined providers of the parent module will be inherited to its
child modules:
Providers that are already defined in a parent, will be overridden if they are also defined in its child.
Testing
For testing purposes react.di
provides a TestBed
component. Nest the
components you want to test in TestBed
and setup its dependencies in
the providers
prop of TestBed
:
; mount TestBed providers= UserProfileContainer/ /TestBed;
or for defining a much simpler mock:
mount TestBed providers= UserProfileContainer/ /TestBed;
API
Injectable
Injectable
decorator marks a class as available to the inversify Container
.
;
Inject
The Inject
/Inject(Identifier)
decorator tells the di-system what need to be injected
and in which property the injected value should be referenced.
Module
All components that should be feedable with the defined providers, need to be nested in a module annotated component - But don't(!) need to be direct children.
providers
(Option)
(optional) Array of all available providers.
Injecting a class constructor
Shorthand
All instantiated dependencies will be a singleton by default. If you don't
want a dependency to be singleton set noSingleton
to true
:
Injecting a value
Injection via factories
Dependencies can be injected via factories. A factory is a simple function, that gets the context of the current scope and returns the value, that will be injected.
imports
(Option)
(optional) Array of all modules that should be imported.
autoBindInjectable
(Option)
(optional, default: false
) When autoBindInjectable
is set to true
, injectable
class constructors don't need to be defined as providers anymore.
They will be available for injection by default.
So that [{provide: UserService, useClass: UserService}]
or [UserService]
can be omitted:
<TestBed => ... // UserService will be available anyway</TestBed>
TestBed (React Component)
TestBed providers= autoBindInjectable= .../TestBed
Provider (React Component)
The <Provider>
component is a react component, that provides low-level
support for inversifyJS containers. In other words: It takes an
inversify container as property. So if you want to use all features
of inversify, this is the component you will fall in love with:
;container.bindNinja.toSamurai; Provider container= .../Provider