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import { TSinjex } from '../classes/TSinjex.js';
import { Identifier } from '../types/Identifier.js';
//#region Overloads
/**
* A decorator to register a class in the **TSinjex** DI (Dependency Injection) container.
* @template TargetType The type of the class to be registered.
* @param identifier The identifier used to register the class in the DI container.
* @see {@link Identifier} for more information on identifiers.
* @param deprecated If true, the dependency is deprecated and a warning
* is logged only once upon the first resolution of the dependency.
* @returns The decorator function to be applied on the class.
* @example
* ```ts
* \@Register('MyClassIdentifier')
* class MyClass {
* // ...
* }
* ```
* @example
* ```ts
* \@Register('MyClassIdentifier', true)
* class MyClass {
* // ...
* }
* ```
*/
export function Register<
TargetType extends new (...args: unknown[]) => InstanceType<TargetType>,
>(
identifier: Identifier,
deprecated?: boolean,
): (constructor: TargetType, ...args: unknown[]) => void;
/**
* A decorator to register an instance of a class in the DI (Dependency Injection) container.
* @template TargetType The type of the class whose instance is to be registered.
* @param identifier The identifier used to register the instance in the DI container.
* @see {@link Identifier} for more information on identifiers.
* @param shouldRegister Set to 'instance' to register the instance in the DI container
* with an empty constructor.
* @param deprecated If true, the dependency is deprecated and a warning
* is logged only once upon the first resolution of the dependency.
* @returns The decorator function to be applied on the class.
* @example
* ```ts
* \@RegisterInstance('MyClassInstanceIdentifier', 'instance')
* class MyClass {
* // ...
* }
* ```
* @example
* ```ts
* \@RegisterInstance('MyClassInstanceIdentifier', 'instance', true)
* class MyClass {
* // ...
* }
* ```
*/
export function Register<
TargetType extends new (..._args: unknown[]) => InstanceType<TargetType>,
>(
identifier: Identifier,
shouldRegister: 'instance',
deprecated?: boolean,
): (constructor: TargetType, ...args: unknown[]) => void;
/**
* A decorator to register an instance of a class in the DI (Dependency Injection) container.
* @template TargetType The type of the class whose instance is to be registered.
* @param identifier The identifier used to register the instance in the DI container.
* @see {@link Identifier} for more information on identifiers.
* @param init An optional initializer function which get the constructor of the class
* as input and returns an instance of the class.
* @param deprecated If true, the dependency is deprecated and a warning
* is logged only once upon the first resolution of the dependency.
* @see {@link InitDelegate} for more information on initializer functions.
* @returns The decorator function to be applied on the class.
* @example
* ```ts
* \@RegisterInstance('MyClassInstanceIdentifier', (constructor) => new constructor())
* class MyClass {
* // ...
* }
* ```
* @example
* ```ts
* \@RegisterInstance('MyClassInstanceIdentifier', (constructor) => new constructor(), true)
* class MyClass {
* // ...
* }
* ```
*/
export function Register<
TargetType extends new (..._args: unknown[]) => InstanceType<TargetType>,
>(
identifier: Identifier,
init?: InitDelegate<
TargetType & { new (..._args: unknown[]): InstanceType<TargetType> },
InstanceType<TargetType>
>,
deprecated?: boolean,
): (constructor: TargetType, ...args: unknown[]) => void;
//#endregion Overloads
// eslint-disable-next-line jsdoc/require-jsdoc
export function Register<
TargetType extends new (...args: unknown[]) => InstanceType<TargetType>,
>(
identifier: Identifier,
arg1?:
| undefined
| boolean
| InitDelegate<TargetType, InstanceType<TargetType>>
| 'instance',
arg2?: boolean,
): (constructor: TargetType, ...args: unknown[]) => void {
const deprecated = typeof arg1 === 'boolean' ? arg1 : arg2;
const init = typeof arg1 === 'function' ? arg1 : undefined;
const shouldRegisterInstance = arg1 === 'instance';
if (init == undefined && shouldRegisterInstance !== true) {
return _register(identifier, deprecated);
} else {
return _registerInstance(identifier, init, deprecated);
}
}
/**
* A decorator to register a class in the **TSinjex** DI (Dependency Injection) container.
* @template TargetType The type of the class to be registered.
* @param identifier The identifier used to register the class in the DI container.
* @see {@link Identifier} for more information on identifiers.
* @param deprecated If true, the dependency is deprecated and a warning
* is logged only once upon the first resolution of the dependency.
* @returns The decorator function to be applied on the class.
* @example
* ```ts
* \@Register('MyClassIdentifier')
* class MyClass {
* // ...
* }
* ```
*/
function _register<
TargetType extends new (...args: unknown[]) => InstanceType<TargetType>,
>(identifier: Identifier, deprecated?: boolean) {
return function (constructor: TargetType, ...args: unknown[]): void {
// Get the instance of the DI container
const diContainer = TSinjex.getInstance();
// Register the class in the DI container
diContainer.register(identifier, constructor, deprecated);
};
}
/**
* A decorator to register an instance of a class in the DI (Dependency Injection) container.
* @template TargetType The type of the class whose instance is to be registered.
* @param identifier The identifier used to register the instance in the DI container.
* @see {@link Identifier} for more information on identifiers.
* @param init An optional initializer function which get the constructor of the class
* as input and returns an instance of the class.
* @param deprecated If true, the dependency is deprecated and a warning
* is logged only once upon the first resolution of the dependency.
* @see {@link InitDelegate} for more information on initializer functions.
* @returns The decorator function to be applied on the class.
* @example
* ```ts
* \@RegisterInstance('MyClassInstanceIdentifier', (constructor) => new constructor())
* class MyClass {
* // ...
* }
* ```
*/
function _registerInstance<
TargetType extends new (..._args: unknown[]) => InstanceType<TargetType>,
>(
identifier: Identifier,
init?: InitDelegate<
TargetType & { new (..._args: unknown[]): InstanceType<TargetType> },
InstanceType<TargetType>
>,
deprecated?: boolean,
) {
return function (constructor: TargetType, ...args: unknown[]): void {
// Get the instance of the DI container
const diContainer = TSinjex.getInstance();
let instance: InstanceType<TargetType>;
// Create a proxy to instantiate the class when needed (Lazy Initialization)
let lazyProxy: unknown = new Proxy(
{},
{
get(target, prop, receiver) {
({ instance, lazyProxy } = initializeInstance<TargetType>(
instance,
init,
constructor,
args,
lazyProxy,
));
// Return the requested property of the instance
return instance[prop as keyof InstanceType<TargetType>];
},
set(target, prop, value, receiver) {
({ instance, lazyProxy } = initializeInstance<TargetType>(
instance,
init,
constructor,
args,
lazyProxy,
));
// Set the requested property of the instance
return (instance[prop as keyof InstanceType<TargetType>] =
value);
},
},
);
// Register the lazy proxy in the DI container
diContainer.register(identifier, lazyProxy, deprecated);
};
}
/**
* Initializes the instance of the class.
* @template TargetType The type of the class whose instance is to be initialized.
* @param instance The instance of the class to be initialized.
* @param init The optional initializer function to initialize the instance.
* @param constructor The constructor of the class.
* @param args The arguments to be passed to the constructor of the class.
* @param lazyProxy The lazy proxy to instantiate the class when needed.
* @returns The initialized instance and the lazy proxy.
*/
function initializeInstance<
TargetType extends new (..._args: unknown[]) => InstanceType<TargetType>,
>(
instance: InstanceType<TargetType>,
init:
| InitDelegate<
TargetType &
(new (..._args: unknown[]) => InstanceType<TargetType>),
InstanceType<TargetType>
>
| undefined,
constructor: TargetType,
args: unknown[],
lazyProxy: unknown,
): { instance: InstanceType<TargetType>; lazyProxy: unknown } {
if (instance == null) {
if (init) {
instance = init(constructor);
} else {
instance = new constructor(...args);
}
}
lazyProxy = instance;
return { instance, lazyProxy };
}
|