monaco-editor-core
Version:
A browser based code editor
31 lines (30 loc) • 917 B
JavaScript
export function memoize(_target, key, descriptor) {
let fnKey = null;
let 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');
}
const memoizeKey = `$memoize$${key}`;
descriptor[fnKey] = function (...args) {
if (!this.hasOwnProperty(memoizeKey)) {
Object.defineProperty(this, memoizeKey, {
configurable: false,
enumerable: false,
writable: false,
value: fn.apply(this, args)
});
}
return this[memoizeKey];
};
}