| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 |
- export class DelayedConstructor {
- constructor(wrap) {
- this.wrap = wrap;
- this.reflectMethods = [
- "get",
- "getPrototypeOf",
- "setPrototypeOf",
- "getOwnPropertyDescriptor",
- "defineProperty",
- "has",
- "set",
- "deleteProperty",
- "apply",
- "construct",
- "ownKeys"
- ];
- }
- createProxy(createObject) {
- const target = {};
- let init = false;
- let value;
- const delayedObject = () => {
- if (!init) {
- value = createObject(this.wrap());
- init = true;
- }
- return value;
- };
- return new Proxy(target, this.createHandler(delayedObject));
- }
- createHandler(delayedObject) {
- const handler = {};
- const install = (name) => {
- handler[name] = (...args) => {
- args[0] = delayedObject();
- const method = Reflect[name];
- return method(...args);
- };
- };
- this.reflectMethods.forEach(install);
- return handler;
- }
- }
- export function delay(wrappedConstructor) {
- if (typeof wrappedConstructor === "undefined") {
- throw new Error("Attempt to `delay` undefined. Constructor must be wrapped in a callback");
- }
- return new DelayedConstructor(wrappedConstructor);
- }
|