rc-js-util/bin/cjs/decorator/once.js

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Once = void 0;
/**
 * @public
 * Method decorator. The target will be called only once, subsequent calls will return the first return.
 */
function Once(target, key, descriptor) {
    const original = target[key];
    const results = new WeakMap();
    target[key] = descriptor.value = function (...args) {
        if (results.has(this)) {
            return results.get(this);
        }
        const result = original.apply(this, args);
        results.set(this, result);
        return result;
    };
}
exports.Once = Once;
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