@sigi/di
v2.13.0
Published
Dependencies injection library for sigi framework
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@sigi/di
Dependencies injection library
Usage
Basic
import { Injectable, InjectableFactory } from '@sigi/di'
@Injectable()
class Engine {}
@Injectable()
class Car {
constructor(public engine: Engine) {}
}
const car = InjectableFactory.getInstance(Car)
expect(car).to.be.instanceof(Car)
expect(car.engine).to.be.instanceof(Engine)
Value Provider
import { Inject, InjectionToken, Injectable, InjectableFactory, ValueProvider } from '@sigi/di'
import Axios from 'axios'
const token = new InjectionToken<Axios>('Axios client')
const provider: ValueProvider = {
provide: token,
useValue: Axios,
}
@Injectable({
providers: [provider],
})
class HttpClient {
constructor(@Inject(token) public axios: Axios) {}
}
const client = InjectableFactory.getInstance(HttpClient)
expect(client).to.be.instanceof(HttpClient)
expect(client.axios).to.equal(Axios)
Factory Provider
import { Inject, InjectionToken, Injectable, InjectableFactory, FactoryProvider } from '@sigi/di'
import Axios from 'axios'
const token = new InjectionToken<Axios>('Axios client')
const baseURL = 'https://leetcode-cn.com/api'
const provider: FactoryProvider = {
provide: token,
useFactory: () => {
return Axios.create({
baseURL,
})
},
}
@Injectable({
providers: [provider],
})
class HttpClient {
constructor(@Inject(token) public axios: Axios) {}
}
const client = InjectableFactory.getInstance(HttpClient)
expect(client).to.be.instanceof(HttpClient)
expect(client.axios).to.equal(Axios) // baseURL of client.axios is 'https://leetcode-cn.com/api'
Testing
Override Provider by configureModule
function whatever() {
return true
}
function replacement() {
return false
}
const token = new InjectionToken<typeof whatever>('replaceable')
const provider: ValueProvider = {
useValue: replacement,
provide: token,
}
@Injectable({
providers: [provider],
})
class Service {
constructor(@Inject(token) public dep: typeof whatever) {}
}
const testModule = Test.createTestingModule({ providers: [{ provide: token, useValue: replacement }] }).compile()
const service = testModule.getInstance(Service)
t.true(service instanceof Service)
t.is(service.dep, replacement)
t.false(service.dep())
Override Provider by overrideProvider method
function whatever() {
return true
}
function replacement() {
return false
}
const token = new InjectionToken<typeof whatever>('replaceable')
const provider: ValueProvider = {
useValue: replacement,
provide: token,
}
@Injectable({
providers: [provider],
})
class Service {
constructor(@Inject(token) public dep: typeof whatever) {}
}
const testModule = Test.createTestingModule().overrideProvider(token).useValue(replacement).compile()
const service = testModule.getInstance(Service)
t.true(service instanceof Service)
t.is(service.dep, replacement)
t.false(service.dep())