ts-ioc-container/esm/utils/proxy.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.

const proxyStateMap = new WeakMap();
const unwrapProxyTarget = (value) => {
    return isProxy(value) ? getProxyTarget(value) : value;
};
export function isProxy(value) {
    return proxyStateMap.has(value);
}
export function getProxyTarget(value) {
    return proxyStateMap.get(value).getTarget();
}
export function lazyProxy(resolveInstance) {
    let instance;
    const state = {
        getTarget: () => {
            instance = instance ?? unwrapProxyTarget(resolveInstance());
            return instance;
        },
    };
    const proxy = new Proxy({}, {
        get: (_, prop) => {
            const target = state.getTarget();
            // @ts-ignore
            return target[prop];
        },
    });
    proxyStateMap.set(proxy, state);
    return proxy;
}
export function toLazyIf(resolveInstance, isLazy = false) {
    if (isLazy) {
        return lazyProxy(resolveInstance);
    }
    return resolveInstance();
}