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<h1><a href="../index.html">All files</a> / <a href="./index.html">decorators</a> RegisterInstance.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { TSinjex } from '../classes/TSinjex';
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import { Identifier } from '../types/Identifier';
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import { InitDelegate } from '../types/InitDelegate';
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/**
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* A decorator to register an instance of a class in the DI (Dependency Injection) container.
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* @template TargetType The type of the class whose instance is to be registered.
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* @param identifier The identifier used to register the instance in the DI container.
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* @see {@link Identifier} for more information on identifiers.
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* @param init An optional initializer function which get the constructor of the class
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* as input and returns an instance of the class.
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* @see {@link InitDelegate} for more information on initializer functions.
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* @returns The decorator function to be applied on the class.
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* @example
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* ```ts
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* \@RegisterInstance('MyClassInstanceIdentifier', (constructor) => new constructor())
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* class MyClass {
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* // ...
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* }
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* ```
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*/
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export function RegisterInstance<
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TargetType extends new (..._args: unknown[]) => InstanceType<TargetType>,
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>(
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identifier: Identifier,
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init?: InitDelegate<
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TargetType & { new (..._args: unknown[]): InstanceType<TargetType> },
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InstanceType<TargetType>
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>,
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) {
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return function (constructor: TargetType, ...args: unknown[]): void {
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// Get the instance of the DI container
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const diContainer = TSinjex.getInstance();
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let instance: InstanceType<TargetType>;
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// Create a proxy to instantiate the class when needed (Lazy Initialization)
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let lazyProxy: unknown = new Proxy(
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{},
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{
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get(target, prop, receiver) {
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if (instance == null) {
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if (init) {
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instance = init(constructor);
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} else {
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instance = new constructor(...args);
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}
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}
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lazyProxy = instance;
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// Return the requested property of the instance
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return instance[prop as keyof InstanceType<TargetType>];
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},
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set(target, prop, value, receiver) {
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if (instance == null) {
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if (init) {
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instance = init(constructor);
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} else {
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instance = new constructor(...args);
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}
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}
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lazyProxy = instance;
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// Set the requested property of the instance
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return (instance[prop as keyof InstanceType<TargetType>] =
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value);
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},
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},
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);
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// Register the lazy proxy in the DI container
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diContainer.register(identifier, lazyProxy);
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};
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}
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</pre></td></tr></table></pre>
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Code coverage generated by
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