monaco-editor/esm/vs/base/common/decorators.js

A browser based code editor

export function memoize(target, key, descriptor) {
    var fnKey = null;
    var fn = null;
    if (typeof descriptor.value === 'function') {
        fnKey = 'value';
        fn = descriptor.value;
        if (fn.length !== 0) {
            console.warn('Memoize should only be used in functions with zero parameters');
        }
    }
    else if (typeof descriptor.get === 'function') {
        fnKey = 'get';
        fn = descriptor.get;
    }
    if (!fn) {
        throw new Error('not supported');
    }
    var memoizeKey = "$memoize$" + key;
    descriptor[fnKey] = function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        if (!this.hasOwnProperty(memoizeKey)) {
            Object.defineProperty(this, memoizeKey, {
                configurable: false,
                enumerable: false,
                writable: false,
                value: fn.apply(this, args)
            });
        }
        return this[memoizeKey];
    };
}