chore: code review

README.md

@@ -214,7 +214,7 @@ The page component to wrap.
 
 Type: `function`
 
-Allows to dynamically change the layout state. Has the following signature: `(newState | updater?)`.
+Allows dynamic changes to the layout state. Has the following signature: `(newState | updater?)`.
 
 The behavior of `setLayoutState` is exactly the same as [`setState`](https://reactjs.org/docs/react-component.html#setstate) of class components: it merges properties and it supports both an object or an updater function.
 
@@ -228,8 +228,8 @@ import styles from './about.module.css';
 
 const About = ({ setLayoutState }) => {
     const handleSetToDark = useCallback(() => {
-        setLayoutState({ variant="dark" });
-        // ..or setLayoutState((layoutState) => ({ variant="dark" }));
+        setLayoutState({ variant: 'dark' });
+        // ..or setLayoutState((layoutState) => ({ variant: 'dark' }));
     }, [setLayoutState]);
 
     return (
@@ -242,7 +242,7 @@ const About = ({ setLayoutState }) => {
 
 const mapLayoutStateToLayoutTree = ({ variant }) => <PrimaryLayout variant={ variant } />;
 
-export default withLayout(mapLayoutStateToLayoutTree, { variant: "light" })(About);
+export default withLayout(mapLayoutStateToLayoutTree, { variant: 'light' })(About);
 ```
 
 ## Tests

src/LayoutTree.js

@@ -21,8 +21,8 @@ export default class LayoutTree extends PureComponent {
     static getDerivedStateFromProps(props, state) {
         const { Component, pageProps } = props;
 
-        const didPageChanged = props.Component !== state.Component;
-        const layoutTree = didPageChanged ? getInitialLayoutTree(Component, pageProps) : state.layoutTree;
+        const didPageChange = props.Component !== state.Component;
+        const layoutTree = didPageChange ? getInitialLayoutTree(Component, pageProps) : state.layoutTree;
 
         return {
             Component,

src/util/full-tree.js

@@ -21,7 +21,7 @@ const addPageToLayoutTree = (layoutNode, page) => cloneElement(layoutNode, {
 
 const createFullTree = (layoutTree, page) => {
     if (!layoutTree) {
-        return layoutTree;
+        return;
     }
 
     validateLayoutTree(layoutTree);

src/util/use-object-state.js

@@ -0,0 +1,23 @@
+import { useState, useRef } from 'react';
+
+const createSetObjectState = (setState) => (updater) => {
+    updater = typeof updater === 'function' ? updater : () => updater;
+
+    return setState((state) => ({
+        ...state,
+        ...updater(state),
+    }));
+};
+
+const useObjectState = (initialState) => {
+    const [state, setState] = useState(() => initialState ?? {});
+    const setObjectStateRef = useRef();
+
+    if (!setObjectStateRef.current) {
+        setObjectStateRef.current = createSetObjectState(setState);
+    }
+
+    return [state, setObjectStateRef.current];
+};
+
+export default useObjectState;

src/with-layout.js

@@ -1,6 +1,6 @@
 import React, { useContext, useMemo, forwardRef, useEffect, useRef } from 'react';
 import hoistNonReactStatics from 'hoist-non-react-statics';
-import useClassState from './util/use-class-state';
+import useObjectState from './util/use-object-state';
 import LayoutContext from './util/context';
 
 const toFunction = (fn) => typeof fn === 'function' ? fn : () => fn;
@@ -22,7 +22,7 @@ const withLayout = (mapLayoutStateToLayoutTree, mapPropsToInitialLayoutState) =>
             }
 
             const { updateLayoutTree } = useContext(LayoutContext);
-            const [layoutState, setLayoutState] = useClassState(initialLayoutStateRef.current);
+            const [layoutState, setLayoutState] = useObjectState(initialLayoutStateRef.current);
 
             useEffect(() => {
                 if (layoutState !== initialLayoutStateRef.current) {