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TypeScript classless DI container design
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| import { container, scopes } from "./library" | |
| import { ListUsers, listUsersFactory } from "./listUsers" | |
| import { UserRepositoryInterface } from "./UserRepoistoryInterface" | |
| import { userRepositoryFactory } from "./userResistory" | |
| const users = [{id: 1, name: "user1"}]; | |
| container.bind<UserRepositoryInterface>().toFactory(userRepositoryFactory, {users}).in(scopes.GLOBAL) | |
| container.bind<ListUsers>().toFactory(listUsersFactory).in(scopes.GLOBAL) |
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| import { ListUsers } from "./listUsers"; | |
| const requestHandlerFactory = ({ | |
| listUsers | |
| }: {listUsers: ListUsers}) => | |
| (request: Request, response: Response): void => { | |
| const users = listUsers(); | |
| response.send(users); | |
| } | |
| export default requestHandlerFactory; |
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| export type Factory<T, Dep extends object> = ({...dependencies}: Dep) => T; | |
| export type Scope = "global" | "request" | "transient"; | |
| export const scopes = { | |
| GLOBAL: "global" as Scope, | |
| REQUEST: "request" as Scope, | |
| TRANSIENT: "transient" as Scope | |
| } | |
| export type Builder<T> = { | |
| to(instance: T): Builder<T> | |
| factory<Dep extends object>(factory: Factory<T, Dep>): Builder<T> | |
| scope(scope: Scope): Builder<T> | |
| } | |
| const bind: <T>() => Builder<T> = <T>() => ({ | |
| to(): Builder<T> { | |
| throw new Error("not implemented"); | |
| }, | |
| factory(): Builder<T> { | |
| throw new Error("not implemented"); | |
| }, | |
| scope(): Builder<T> { | |
| throw new Error("not implemented"); | |
| } | |
| }) | |
| const get: <T>() => T = <T>() => { | |
| throw new Error("not implemented"); | |
| } | |
| export const container = { | |
| get, | |
| bind | |
| } |
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| import { UserRepositoryInterface } from "./UserRepoistoryInterface"; | |
| export const listUsersFactory = ({userRepository}: {userRepository: UserRepositoryInterface}) => | |
| () => userRepository.list() | |
| export type ListUsers = ReturnType<typeof listUsersFactory>; |
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| import { User, UserRepositoryInterface } from "./UserRepoistoryInterface"; | |
| export const userRepositoryFactory = ({users}: {users: User[]}) => ( | |
| { | |
| list: () => users | |
| } | |
| ) |
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| export type User = { | |
| id: number | |
| name: string | |
| } | |
| export interface UserRepositoryInterface { | |
| list(): User[] | |
| } |
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