ts-ioc-container/esm/hooks/hook.js

Fast, lightweight TypeScript dependency injection container with a clean API, scoped lifecycles, decorators, tokens, hooks, lazy injection, customizable providers, and no global container objects.

import { Is } from '../utils/basic';
import { getProxyTarget, isProxy } from '../utils/proxy';
const isHookClassConstructor = (execute) => {
    return Is.constructor(execute) && execute.prototype.execute;
};
export const toHookFn = (execute) => isHookClassConstructor(execute) ? (context) => context.scope.resolve(execute).execute(context) : execute;
const getReflectionTarget = (target) => {
    return isProxy(target) ? getProxyTarget(target) : target;
};
// Walk the constructor's prototype chain (most-derived first) collecting each class.
const getConstructorChain = (ctor) => {
    const chain = [];
    let current = ctor;
    while (typeof current === 'function' && current !== Function.prototype) {
        chain.push(current);
        current = Object.getPrototypeOf(current);
    }
    return chain;
};
// Get hooks metadata, merging hooks declared on parent (extended-from) classes.
// Hooks are collected from base to derived so a derived class's hooks for the same
// method name take precedence over (replace) the parent's.
export function getHooks(target, key) {
    const reflectionTarget = getReflectionTarget(target);
    const merged = new Map();
    for (const ctor of getConstructorChain(reflectionTarget.constructor).reverse()) {
        const ownHooks = Reflect.getOwnMetadata(key, ctor);
        if (ownHooks) {
            for (const [methodName, fns] of ownHooks) {
                merged.set(methodName, fns);
            }
        }
    }
    return merged;
}
export function hasHooks(target, key) {
    const reflectionTarget = getReflectionTarget(target);
    return getConstructorChain(reflectionTarget.constructor).some((ctor) => Reflect.hasOwnMetadata(key, ctor));
}
// Hook decorator
export const hook = (key, ...fns) => (target, propertyKey) => {
    const hooks = Reflect.hasOwnMetadata(key, target.constructor)
        ? Reflect.getOwnMetadata(key, target.constructor)
        : new Map();
    hooks.set(propertyKey, (hooks.get(propertyKey) ?? []).concat(fns));
    Reflect.defineMetadata(key, hooks, target.constructor);
};