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

export const once = ({ onRepeat } = {}) => (target, propertyKey, descriptor) => {
    const originalMethod = descriptor.value;
    const cacheMap = new WeakMap();
    let index = 0;
    descriptor.value = function (...args) {
        index++;
        if (cacheMap.has(this)) {
            onRepeat?.({ index: index - 1, args });
            return cacheMap.get(this);
        }
        const result = originalMethod.apply(this, args);
        cacheMap.set(this, result);
        return result;
    };
    return descriptor;
};