ioc.ts

TypeScript Dependency Injection

Features

• Type safe
• Tiny (614 bytes before minification or compression)
• No classes required
• Supports multiple containers

Install

npm i -S ioc-ts

API

Import:

import container from 'ioc-ts'

container(deps?: { [key: string]: any }): Container

Create a container, optionally specifying dependencies.

Dependencies should be an object. Returns the container.

const c = container({
    x: 'foo',
    y: 'bar',
})

Container#define(deps?: { [key: string]: any }): Container

Add additional dependencies to a container. Does not mutate underlying container. Can be chained.

const c = container({ x: 'foo' }).define({ y: 1 }).define({ z: true })
// c now has x, y and z.

Container#combine(container: Container): Container

Combine the dependencies of two containers. Does not mutate underlying container. Can be chained.

const c1 = container({ x: 'foo' })
const c2 = container({ y: 1 })
const c = container({ z: true }).combine(c1).combine(c2)
// c now has x, y and z.

Container#inject(fn: Function): Function

Inject a function with dependencies from a container.

Container must type-match the dependencies of the target function.

Target function must specify dependencies as the first argument.

function iNeedDependencies(deps: { x: string }, arg1: number) {
    console.log(deps.x, arg1)
}
 
const c = container({ x: 'foo' })
const iHasDependencies = c.inject(iNeedDependencies)
iHasDependencies(42) // logs 'foo', 42