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import type {
Factorable,
FactorableWithArgs,
} from '../interfaces/factory.interface.mjs'
import type { ServiceInitializationContext } from '../internal/context/service-initialization-context.mjs'
import type {
BoundInjectionToken,
ClassType,
ClassTypeWithArgument,
ClassTypeWithoutArguments,
FactoryInjectionToken,
InjectionToken,
InjectionTokenSchemaType,
} from '../token/injection-token.mjs'
import type {
InjectRequest,
InjectState,
Join,
UnionToArray,
} from './types.mjs'
import { withoutResolutionContext } from '../internal/context/resolution-context.mjs'
import { InjectableTokenMeta } from '../symbols/index.mjs'
export interface Injectors {
// #1 Simple class
asyncInject<T extends ClassTypeWithoutArguments>(
token: T,
): InstanceType<T> extends Factorable<infer R>
? Promise<R>
: Promise<InstanceType<T>>
asyncInject<Args, T extends ClassTypeWithArgument<Args>>(
token: T,
args: Args,
): Promise<InstanceType<T>>
asyncInject<
Schema extends InjectionTokenSchemaType,
R,
T extends FactorableWithArgs<R, Schema>,
>(
token: T,
args: z.input<Schema>,
): Promise<R>
// #2 Token with required Schema
asyncInject<T, S extends InjectionTokenSchemaType>(
token: InjectionToken<T, S>,
args: z.input<S>,
): Promise<T>
// #3 Token with optional Schema
asyncInject<T, S extends InjectionTokenSchemaType, R extends boolean>(
token: InjectionToken<T, S, R>,
): R extends false
? Promise<T>
: S extends ZodType<infer Type>
? `Error: Your token requires args: ${Join<
UnionToArray<keyof Type>,
', '
>}`
: 'Error: Your token requires args'
// #4 Token with no Schema
asyncInject<T>(token: InjectionToken<T, undefined>): Promise<T>
asyncInject<T>(token: BoundInjectionToken<T, any>): Promise<T>
asyncInject<T>(token: FactoryInjectionToken<T, any>): Promise<T>
inject<T extends ClassTypeWithoutArguments>(
token: T,
): InstanceType<T> extends Factorable<infer R> ? R : InstanceType<T>
inject<Args, T extends ClassTypeWithArgument<Args>>(
token: T,
args: Args,
): InstanceType<T>
inject<
Schema extends InjectionTokenSchemaType,
R,
T extends FactorableWithArgs<R, Schema>,
>(
token: T,
args: z.input<Schema>,
): R
inject<T, S extends InjectionTokenSchemaType>(
token: InjectionToken<T, S>,
args: z.input<S>,
): T
// #3 Token with optional Schema
inject<T, S extends InjectionTokenSchemaType, R extends boolean>(
token: InjectionToken<T, S, R>,
): R extends false
? T
: S extends ZodType<infer Type>
? `Error: Your token requires args: ${Join<
UnionToArray<keyof Type>,
', '
>}`
: 'Error: Your token requires args'
inject<T>(token: InjectionToken<T, undefined>): T
inject<T>(token: BoundInjectionToken<T, any>): T
inject<T>(token: FactoryInjectionToken<T, any>): T
/**
* Optional injection that returns null if the service fails to initialize
* or is not available. This is useful when you want to inject a service
* that may not be configured or may fail gracefully.
*
* @example
* ```ts
* class MyService {
* constructor() {
* const optionalService = optional(OptionalServiceToken)
* // optionalService will be null if initialization fails
* if (optionalService) {
* optionalService.doSomething()
* }
* }
* }
* ```
*/
optional<T extends ClassType>(
token: T,
): (InstanceType<T> extends Factorable<infer R> ? R : InstanceType<T>) | null
optional<T, S extends InjectionTokenSchemaType>(
token: InjectionToken<T, S>,
args: z.input<S>,
): T | null
optional<T, S extends InjectionTokenSchemaType, R extends boolean>(
token: InjectionToken<T, S, R>,
): R extends false
? T | null
: S extends ZodType<infer Type>
? `Error: Your token requires args: ${Join<
UnionToArray<keyof Type>,
', '
>}`
: 'Error: Your token requires args'
optional<T>(token: InjectionToken<T, undefined>): T | null
optional<T>(token: BoundInjectionToken<T, any>): T | null
optional<T>(token: FactoryInjectionToken<T, any>): T | null
wrapSyncInit(
cb: () => any,
): (injectState?: InjectState) => [any, Promise<any>[], InjectState]
provideFactoryContext(
context: ServiceInitializationContext | null,
): ServiceInitializationContext | null
}
export function getInjectors() {
let currentFactoryContext: ServiceInitializationContext | null = null
function provideFactoryContext(
context: ServiceInitializationContext | null,
): ServiceInitializationContext | null {
const original = currentFactoryContext
currentFactoryContext = context
return original
}
function getFactoryContext(): ServiceInitializationContext {
Iif (!currentFactoryContext) {
throw new Error(
'[Injector] Trying to access injection context outside of a injectable context',
)
}
return currentFactoryContext
}
let promiseCollector: null | ((promise: Promise<any>) => void) = null
let injectState: InjectState | null = null
function getRequest(
token: InjectionToken<any>,
args?: unknown,
skipCycleTracking = false,
) {
Iif (!injectState) {
throw new Error(
'[Injector] Trying to make a request outside of a injectable context',
)
}
if (injectState.isFrozen) {
const idx = injectState.currentIndex++
const request = injectState.requests[idx]
Iif (request.token !== token) {
throw new Error(
`[Injector] Wrong token order. Expected ${request.token.toString()} but got ${token.toString()}`,
)
}
return request
}
let result: any = null
let error: Error | null = null
// For async inject, we run outside the resolution context to skip cycle tracking.
// This is because asyncInject returns a promise that doesn't block the constructor,
// so it cannot cause a deadlock even with circular dependencies.
const doInject = () =>
getFactoryContext()
.inject(token as any, args as any)
.then((r) => {
result = r
return r
})
.catch((e) => {
// We don't throw here because we have a mechanism to handle errors
error = e
})
const promise = skipCycleTracking
? withoutResolutionContext(doInject)
: doInject()
const request: InjectRequest = {
token,
promise,
get result() {
return result
},
get error() {
return error
},
}
injectState.requests.push(request)
injectState.currentIndex++
return request
}
function asyncInject(
token:
| ClassType
| InjectionToken<any>
| BoundInjectionToken<any, any>
| FactoryInjectionToken<any, any>,
args?: unknown,
) {
if (!injectState) {
throw new Error(
'[Injector] Trying to access inject outside of a injectable context',
)
}
// @ts-expect-error In case we have a class
const realToken = token[InjectableTokenMeta] ?? token
// Pass skipCycleTracking=true because asyncInject returns a promise that doesn't
// block the constructor, so it cannot cause a deadlock even with circular dependencies.
const request = getRequest(realToken, args, true)
return request.promise.then((result) => {
Iif (request.error) {
// We throw here because we want to fail the asyncInject call if the dependency fails to initialize
throw request.error
}
return result
})
}
function wrapSyncInit(cb: () => any) {
return (previousState?: InjectState) => {
const promises: Promise<any>[] = []
const originalPromiseCollector = promiseCollector
const originalInjectState = injectState
injectState = previousState
? {
...previousState,
currentIndex: 0,
}
: {
currentIndex: 0,
isFrozen: false,
requests: [],
}
promiseCollector = (promise) => {
promises.push(promise)
}
const result = cb()
promiseCollector = originalPromiseCollector
const newInjectState = {
...injectState,
isFrozen: true,
}
injectState = originalInjectState
return [result, promises, newInjectState]
}
}
function inject<
T,
Token extends
| InjectionToken<T>
| BoundInjectionToken<T, any>
| FactoryInjectionToken<T, any>,
S extends ZodObject | unknown = Token['schema'],
>(token: Token, args?: S extends ZodObject ? z.input<S> : never): T {
// @ts-expect-error In case we have a class
const realToken = token[InjectableTokenMeta] ?? token
if (!injectState) {
throw new Error(
'[Injector] Trying to access inject outside of a injectable context',
)
}
// Try to get cached instance synchronously (only on first run, not frozen replay)
const ctx = getFactoryContext()
const cachedInstance = !injectState.isFrozen
? ctx.container.tryGetSync(realToken, args)
: null
// getRequest handles both frozen replay and first run:
// - Frozen: validates token order and returns cached request
// - First run: creates new request with ctx.inject promise
const request = getRequest(realToken, args)
// If we have a cached instance, return it directly
if (cachedInstance) {
return cachedInstance as unknown as T
}
// Check for errors or already-resolved results
if (request.error) {
throw request.error
}
if (request.result) {
return request.result as T
}
// Collect promise for awaiting (first run only, frozen state already has results)
Eif (promiseCollector && !injectState.isFrozen) {
promiseCollector(request.promise)
}
// Return a proxy that throws if accessed before initialization
return new Proxy(
{},
{
get() {
throw new Error(
`[Injector] Trying to access ${realToken.toString()} before it's initialized, please move the code to a onServiceInit method`,
)
},
},
) as unknown as T
}
function optional<
T,
Token extends
| InjectionToken<T>
| BoundInjectionToken<T, any>
| FactoryInjectionToken<T, any>,
S extends ZodObject | unknown = Token['schema'],
>(token: Token, args?: S extends ZodObject ? z.input<S> : never): T | null {
try {
return inject(token, args)
} catch {
// If injection fails, return null instead of throwing
return null
}
}
const injectors: Injectors = {
asyncInject,
inject,
optional,
wrapSyncInit,
provideFactoryContext,
} as Injectors
return injectors
}
|