538 lines
23 KiB
HTML
538 lines
23 KiB
HTML
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<title>Code coverage report for decorators/Inject.ts</title>
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<meta charset="utf-8" />
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<link rel="stylesheet" href="../prettify.css" />
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<h1><a href="../index.html">All files</a> / <a href="./index.html">decorators</a> Inject.ts</h1>
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<div class='fl pad1y space-right2'>
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<span class="strong">96.66% </span>
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<span class="quiet">Statements</span>
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<span class='fraction'>29/30</span>
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<span class="strong">88% </span>
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<span class="quiet">Branches</span>
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<span class='fraction'>22/25</span>
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<span class="strong">100% </span>
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<span class="quiet">Functions</span>
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<span class='fraction'>9/9</span>
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<span class="strong">96.55% </span>
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<span class='fraction'>28/29</span>
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</div>
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<p class="quiet">
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Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
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<div class='status-line high'></div>
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<pre><table class="coverage">
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<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
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<a name='L152'></a><a href='#L152'>152</a></td><td class="line-coverage quiet"><span class="cline-any cline-yes">1x</span>
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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.js';
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import {
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DependencyResolutionError,
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InitializationError,
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InjectorError,
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NoInstantiationMethodError,
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} from '../interfaces/Exceptions.js';
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import { Identifier } from '../types/Identifier.js';
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import { InitDelegate } from '../types/InitDelegate.js';
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/**
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* A decorator to inject a dependency from a DI (Dependency Injection) container into a class property.
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* @template T The type of the dependency to be injected.
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* @template U The type of the property to be injected.
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* @param identifier The identifier used to resolve the class in the DI container.
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* @see {@link Identifier} for more information on identifiers.
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* @param init Optional an initializer function to transform the dependency before injection
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* or true to instantiate the dependency if it has a constructor.
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* @see {@link InitDelegate} for more information on initializer functions.
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* @param isNecessary If true, throws an error if the dependency is not found.
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* @returns The resolved dependency or undefined if the dependency is not necessary
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* and not found, or throws an error if the dependency is necessary and not found.
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* @throws **Only throws errors if the dependency is necessary.**
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* @throws A {@link DependencyResolutionError} if the dependency is not found.
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* @throws A {@link InjectorError} if an error occurs during the injection process.
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* @throws A {@link NoInstantiationMethodError} if the dependency does not have a constructor.
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* @throws An {@link InitializationError} if an error occurs during the initialization process.
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* @example
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* ```ts
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* class MyClass {
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* \@Inject<MyDependency>('MyDependencyIdentifier')
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* private myDependency!: MyDependency;
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* }
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* ```
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* @example
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* ```ts
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* class MyClass {
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* \@Inject('ILogger_', (x: ILogger_) => x.getLogger('Tags'), false)
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* private _logger?: ILogger;
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* }
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* ```
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*/
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export function Inject<T, U>(
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identifier: Identifier,
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init?: InitDelegate<T, U> | true,
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isNecessary = true,
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) {
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return function (target: unknown, propertyKey: string | symbol): void {
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/**
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* Function to evaluate the dependency lazily
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* to avoid circular dependencies, not found dependencies, etc.
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* @returns The resolved dependency or undefined if the dependency is not found.
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*/
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const resolve = (): T | undefined => {
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return TSinjex.getInstance().resolve<T>(identifier, isNecessary);
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};
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Object.defineProperty(target, propertyKey, {
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get() {
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let instance: T | U | undefined;
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|
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const dependency: T | undefined = tryAndCatch(
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() => resolve(),
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isNecessary,
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identifier,
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DependencyResolutionError,
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|
);
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if (dependency != null) {
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const initFunction: (() => U) | undefined =
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typeof init === 'function' && dependency != null
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? (): U => init(dependency)
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: init === true && hasConstructor(dependency)
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? (): U => new dependency() as U
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: undefined;
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|
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if (init == null) instance = dependency;
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else if (initFunction != null)
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instance = tryAndCatch(
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initFunction,
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isNecessary,
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|
identifier,
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|
InitializationError,
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|
);
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else if (isNecessary)
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throw new NoInstantiationMethodError(identifier);
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} else if (isNecessary)
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throw new DependencyResolutionError(identifier);
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/**
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* Replace itself with the resolved dependency
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* for performance reasons.
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*/
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Object.defineProperty(this, propertyKey, {
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value: instance,
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writable: false,
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enumerable: false,
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configurable: false,
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});
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return instance;
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},
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/**
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* Make the property configurable to allow replacing it
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*/
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configurable: true,
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});
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};
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}
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/**
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|
* Tries to execute a function and catches any errors that occur.
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* If the function is necessary and an error occurs, it throws the error
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* with the specified error class and identifier.
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* @param fn The function to execute.
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* @param necessary If true, throws an error if an error occurs.
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* @param identifier The identifier of the dependency.
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* @param errorClass The error class to throw if an error occurs.
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* @returns The result of the function or undefined if an error occurs and the function is not necessary.
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*/
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function tryAndCatch<ReturnType, ErrorType>(
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fn: () => ReturnType,
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necessary: boolean,
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|
identifier?: Identifier,
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|
errorClass?: ErrorType,
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|
): ReturnType | undefined {
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try {
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return fn();
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} catch (error) {
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if (necessary)
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throw new (errorClass != null ? errorClass : <span class="branch-1 cbranch-no" title="branch not covered" >error)</span>(
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|
identifier ?? <span class="branch-1 cbranch-no" title="branch not covered" >'not specified',</span>
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error,
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|
);
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else <span class="cstat-no" title="statement not covered" ><span class="missing-if-branch" title="else path not taken" >E</span>return undefined;</span>
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}
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}
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|
/**
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|
* Checks if an object has a constructor.
|
|
* @param obj The object to check.
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|
* @returns True if the object has a constructor, false otherwise.
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|
*/
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|
function hasConstructor<T>(obj: T): obj is T & { new (): unknown } {
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|
const _obj = obj as unknown as { prototype?: { constructor?: unknown } };
|
|
|
|
return (
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|
_obj?.prototype != null &&
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typeof _obj.prototype.constructor === 'function'
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|
);
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|
}
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</pre></td></tr></table></pre>
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