add patcher and react utils

src/index.ts

@@ -2,3 +2,4 @@
 export * from './deck-components';
 export * from './plugin';
 export * from './webpack';
+export * from './utils';

src/utils.ts

@@ -0,0 +1,87 @@
+import * as React from "react";
+
+// this shouldn't need to be redeclared but it does for some reason
+
+declare global {
+    interface Window {
+      SP_REACT: typeof React;
+    }
+}
+
+export function fakeRenderComponent(fun: Function): any {
+    const hooks = (window.SP_REACT as any).__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentDispatcher.current;
+
+    // TODO: add more hooks
+
+    let oldHooks = {
+        useContext: hooks.useContext,
+        useCallback: hooks.useCallback,
+        useLayoutEffect: hooks.useLayoutEffect,
+        useEffect: hooks.useEffect,
+        useMemo: hooks.useMemo,
+        useRef: hooks.useRef,
+        useState: hooks.useState,
+    }
+
+    hooks.useCallback = (cb: Function) => cb;
+    hooks.useContext = (cb: any) => cb._currentValue;
+    hooks.useLayoutEffect = (_: Function) => {}//cb();
+    hooks.useMemo = (cb: Function, _: any[]) => cb;
+    hooks.useEffect = (_: Function) => {}//cb();
+    hooks.useRef = (val: any) => ({current: val || {}});
+    hooks.useState = (v: any) => {
+        let val = v;
+
+        return [val, (n: any) => val = n];
+    };
+
+    const res = fun(hooks);
+
+    Object.assign(hooks, oldHooks);
+
+    return res;
+}
+
+export function beforePatch(obj: any, name: string, fnc: Function): void {
+    const orig = obj[name];
+    obj[name] = function (...args: any[]) {
+        fnc.call(this, args);
+        return orig.call(this, ...args);
+    }
+    Object.assign(obj[name], orig);
+    obj[name].toString = () => orig.toString();
+    obj[name].__deckyOrig = orig;
+}
+
+export function afterPatch(obj: any, name: string, fnc: Function): void {
+    const orig = obj[name];
+    obj[name] = function (...args: any[]) {
+        let ret = orig.call(this, ...args);
+        ret = fnc.call(this, args, ret);
+        return ret;
+    }
+    Object.assign(obj[name], orig);
+    obj[name].toString = () => orig.toString();
+    obj[name].__deckyOrig = orig;
+}
+
+export function replacePatch(obj: any, name: string, fnc: Function): void {
+    const orig = obj[name];
+    obj[name] = function (...args: any[]) {
+      const ret = fnc.call(this, args);
+      if (ret == 'CALL_ORIGINAL') return orig.call(this, ...args);
+      return ret;
+    };
+    Object.assign(obj[name], orig);
+    obj[name].toString = () => orig.toString();
+    obj[name].__deckyOrig = orig;
+}
+
+// TODO allow one method to be patched and unpatched multiple times independently using IDs in a Map or something
+export function unpatch(obj: any, name: any): void {
+    obj[name] = obj[name].__deckyOrig;
+}
+
+export function getReactInstance(o: HTMLElement | Element | Node) {
+    return o[Object.keys(o).find(k => k.startsWith('__reactInternalInstance')) as string]
+}