ffbt/dist/core/memoize-decorator.js

Build a Typescript app without pain

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dropCacheFor = exports.Memoize = void 0;
/**
 * Decorates method/getter call
 * @param descriptor - PropertyDescriptor. See details in Object.defineProperty docs (Link below)
 * @param type - Specifies which property to decorate
 * @param propertyKey - method/getter name
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
 */
function decoratePropertyDescriptor(descriptor, type, propertyKey) {
    const originalFunc = descriptor[type];
    descriptor[type] = function (...args) {
        if (!this.__memoizeDecoratorData) {
            this.__memoizeDecoratorData = {};
        }
        const hasCachedValue = this.__memoizeDecoratorData.hasOwnProperty(propertyKey);
        if (!hasCachedValue) {
            this.__memoizeDecoratorData[propertyKey] = originalFunc.apply(this, args);
        }
        return this.__memoizeDecoratorData[propertyKey];
    };
}
/**
 * Caches function execution result between calls
 */
function Memoize() {
    return function (target, propertyKey, descriptor) {
        if (descriptor.set) {
            throw new Error("Can't memoize descriptor with setter");
        }
        const decorationType = descriptor.get ? "get" : "value";
        decoratePropertyDescriptor(descriptor, decorationType, propertyKey);
        return descriptor;
    };
}
exports.Memoize = Memoize;
function dropCacheFor(obj, method) {
    const cachedValues = obj.__memoizeDecoratorData;
    if (!cachedValues) {
        return;
    }
    delete cachedValues[method];
}
exports.dropCacheFor = dropCacheFor;