Improve the initial loading of the site editor

docs/reference-guides/data/data-core.md

@@ -626,11 +626,9 @@ _Returns_
 
 ### receiveThemeSupports
 
-Returns an action object used in signalling that the index has been received.
-
-_Parameters_
+> **Deprecated** since WP 5.9, this is not useful anymore, use the selector direclty.
 
--   _themeSupports_ `Object`: Theme support for the current theme.
+Returns an action object used in signalling that the index has been received.
 
 _Returns_
 

lib/full-site-editing/edit-site-page.php

@@ -89,7 +89,7 @@ function gutenberg_edit_site_init( $hook ) {
 	 */
 	$current_screen->is_block_editor( true );
 
-	$custom_settings     = array(
+	$custom_settings         = array(
 		'siteUrl'                              => site_url(),
 		'postsPerPage'                         => get_option( 'posts_per_page' ),
 		'styles'                               => gutenberg_get_editor_styles(),
@@ -98,9 +98,10 @@ function gutenberg_edit_site_init( $hook ) {
 		'__experimentalBlockPatterns'          => WP_Block_Patterns_Registry::get_instance()->get_all_registered(),
 		'__experimentalBlockPatternCategories' => WP_Block_Pattern_Categories_Registry::get_instance()->get_all_registered(),
 	);
-	$site_editor_context = new WP_Block_Editor_Context();
-	$settings            = gutenberg_get_block_editor_settings( $custom_settings, $site_editor_context );
-
+	$site_editor_context     = new WP_Block_Editor_Context();
+	$settings                = gutenberg_get_block_editor_settings( $custom_settings, $site_editor_context );
+	$active_global_styles_id = WP_Theme_JSON_Resolver_Gutenberg::get_user_custom_post_type_id();
+	$active_theme            = wp_get_theme()->get_stylesheet();
 	gutenberg_initialize_editor(
 		'edit_site_editor',
 		'edit-site',
@@ -111,7 +112,16 @@ function gutenberg_edit_site_init( $hook ) {
 				'/wp/v2/types?context=edit',
 				'/wp/v2/taxonomies?context=edit',
 				'/wp/v2/pages?context=edit',
-				'/wp/v2/themes?status=active',
+				'/wp/v2/categories?context=edit',
+				'/wp/v2/posts?context=edit',
+				'/wp/v2/tags?context=edit',
+				'/wp/v2/templates?context=edit',
+				'/wp/v2/template-parts?context=edit',
+				'/wp/v2/settings',
+				'/wp/v2/themes?context=edit&status=active',
+				'/wp/v2/global-styles/' . $active_global_styles_id . '?context=edit',
+				'/wp/v2/global-styles/' . $active_global_styles_id,
+				'/wp/v2/themes/' . $active_theme . '/global-styles',
 			),
 			'initializer_name' => 'initialize',
 			'editor_settings'  => $settings,

packages/api-fetch/src/middlewares/preloading.js

@@ -1,7 +1,7 @@
 /**
  * WordPress dependencies
  */
-import { normalizePath } from '@wordpress/url';
+import { getQueryArg, normalizePath } from '@wordpress/url';
 
 /**
  * @param {Record<string, any>} preloadedData
@@ -15,9 +15,17 @@ function createPreloadingMiddleware( preloadedData ) {
 
 	return ( options, next ) => {
 		const { parse = true } = options;
-		if ( typeof options.path === 'string' ) {
+		/** @type {string | void} */
+		let rawPath = options.path;
+		if ( ! rawPath && options.url ) {
+			const pathFromQuery = getQueryArg( options.url, 'rest_route' );
+			if ( typeof pathFromQuery === 'string' ) {
+				rawPath = pathFromQuery;
+			}
+		}
+		if ( typeof rawPath === 'string' ) {
 			const method = options.method || 'GET';
-			const path = normalizePath( options.path );
+			const path = normalizePath( rawPath );
 
 			if ( 'GET' === method && cache[ path ] ) {
 				const cacheData = cache[ path ];

packages/core-data/README.md

@@ -160,11 +160,9 @@ _Returns_
 
 ### receiveThemeSupports
 
-Returns an action object used in signalling that the index has been received.
-
-_Parameters_
+> **Deprecated** since WP 5.9, this is not useful anymore, use the selector direclty.
 
--   _themeSupports_ `Object`: Theme support for the current theme.
+Returns an action object used in signalling that the index has been received.
 
 _Returns_
 

packages/core-data/src/actions.js

@@ -9,6 +9,7 @@ import { v4 as uuid } from 'uuid';
  */
 import apiFetch from '@wordpress/api-fetch';
 import { addQueryArgs } from '@wordpress/url';
+import deprecated from '@wordpress/deprecated';
 
 /**
  * Internal dependencies
@@ -136,14 +137,17 @@ export function __experimentalReceiveCurrentGlobalStylesId(
 /**
  * Returns an action object used in signalling that the index has been received.
  *
- * @param {Object} themeSupports Theme support for the current theme.
+ * @deprecated since WP 5.9, this is not useful anymore, use the selector direclty.
  *
  * @return {Object} Action object.
  */
-export function receiveThemeSupports( themeSupports ) {
+export function receiveThemeSupports() {
+	deprecated( "wp.data.dispatch( 'core' ).receiveThemeSupports", {
+		since: '5.9',
+	} );
+
 	return {
-		type: 'RECEIVE_THEME_SUPPORTS',
-		themeSupports,
+		type: 'DO_NOTHING',
 	};
 }
 

packages/core-data/src/entities.js

@@ -23,7 +23,7 @@ export const defaultEntities = [
 		label: __( 'Base' ),
 		name: '__unstableBase',
 		kind: 'root',
-		baseURL: '',
+		baseURL: '/',
 	},
 	{
 		label: __( 'Site' ),
@@ -136,6 +136,14 @@ export const defaultEntities = [
 		plural: 'globalStylesVariations', // should be different than name
 		getTitle: ( record ) => record?.title?.rendered || record?.title,
 	},
+	{
+		label: __( 'Themes' ),
+		name: 'theme',
+		kind: 'root',
+		baseURL: '/wp/v2/themes',
+		baseURLParams: { context: 'edit' },
+		key: 'stylesheet',
+	},
 ];
 
 export const kinds = [

packages/core-data/src/reducer.js

@@ -136,46 +136,6 @@ export function currentGlobalStylesId( state = undefined, action ) {
 	return state;
 }
 
-/**
- * Reducer managing installed themes.
- *
- * @param {Object} state  Current state.
- * @param {Object} action Dispatched action.
- *
- * @return {Object} Updated state.
- */
-export function themes( state = {}, action ) {
-	switch ( action.type ) {
-		case 'RECEIVE_CURRENT_THEME':
-			return {
-				...state,
-				[ action.currentTheme.stylesheet ]: action.currentTheme,
-			};
-	}
-
-	return state;
-}
-
-/**
- * Reducer managing theme supports data.
- *
- * @param {Object} state  Current state.
- * @param {Object} action Dispatched action.
- *
- * @return {Object} Updated state.
- */
-export function themeSupports( state = {}, action ) {
-	switch ( action.type ) {
-		case 'RECEIVE_THEME_SUPPORTS':
-			return {
-				...state,
-				...action.themeSupports,
-			};
-	}
-
-	return state;
-}
-
 /**
  * Higher Order Reducer for a given entity config. It supports:
  *
@@ -590,8 +550,6 @@ export default combineReducers( {
 	currentGlobalStylesId,
 	currentUser,
 	taxonomies,
-	themes,
-	themeSupports,
 	entities,
 	undo,
 	embedPreviews,

packages/core-data/src/resolvers.js

@@ -14,7 +14,7 @@ import apiFetch from '@wordpress/api-fetch';
  */
 import { STORE_NAME } from './name';
 import { getKindEntities, DEFAULT_ENTITY_KEY } from './entities';
-import { ifNotResolved, getNormalizedCommaSeparable } from './utils';
+import { forwardResolver, getNormalizedCommaSeparable } from './utils';
 
 /**
  * Requests authors from the REST API.
@@ -115,18 +115,12 @@ export const getEntityRecord = ( kind, name, key = '', query ) => async ( {
 /**
  * Requests an entity's record from the REST API.
  */
-export const getRawEntityRecord = ifNotResolved(
-	getEntityRecord,
-	'getEntityRecord'
-);
+export const getRawEntityRecord = forwardResolver( 'getEntityRecord' );
 
 /**
  * Requests an entity's record from the REST API.
  */
-export const getEditedEntityRecord = ifNotResolved(
-	getRawEntityRecord,
-	'getRawEntityRecord'
-);
+export const getEditedEntityRecord = forwardResolver( 'getEntityRecord' );
 
 /**
  * Requests the entity's records from the REST API.
@@ -224,22 +218,20 @@ getEntityRecords.shouldInvalidate = ( action, kind, name ) => {
 /**
  * Requests the current theme.
  */
-export const getCurrentTheme = () => async ( { dispatch } ) => {
-	const activeThemes = await apiFetch( {
-		path: '/wp/v2/themes?status=active',
-	} );
+export const getCurrentTheme = () => async ( { dispatch, resolveSelect } ) => {
+	const activeThemes = await resolveSelect.getEntityRecords(
+		'root',
+		'theme',
+		{ status: 'active' }
+	);
+
 	dispatch.receiveCurrentTheme( activeThemes[ 0 ] );
 };
 
 /**
  * Requests theme supports data from the index.
  */
-export const getThemeSupports = () => async ( { dispatch } ) => {
-	const activeThemes = await apiFetch( {
-		path: '/wp/v2/themes?status=active',
-	} );
-	dispatch.receiveThemeSupports( activeThemes[ 0 ].theme_supports );
-};
+export const getThemeSupports = forwardResolver( 'getCurrentTheme' );
 
 /**
  * Requests a preview from the from the Embed API.
@@ -421,10 +413,13 @@ __experimentalGetTemplateForLink.shouldInvalidate = ( action ) => {
 
 export const __experimentalGetCurrentGlobalStylesId = () => async ( {
 	dispatch,
+	resolveSelect,
 } ) => {
-	const activeThemes = await apiFetch( {
-		path: '/wp/v2/themes?status=active',
-	} );
+	const activeThemes = await resolveSelect.getEntityRecords(
+		'root',
+		'theme',
+		{ status: 'active' }
+	);
 	const globalStylesURL = get( activeThemes, [
 		0,
 		'_links',

packages/core-data/src/selectors.js

@@ -19,6 +19,15 @@ import { getQueriedItems } from './queried-data';
 import { DEFAULT_ENTITY_KEY } from './entities';
 import { getNormalizedCommaSeparable, isRawAttribute } from './utils';
 
+/**
+ * Shared reference to an empty object for cases where it is important to avoid
+ * returning a new object reference on every invocation, as in a connected or
+ * other pure component which performs `shouldComponentUpdate` check on props.
+ * This should be used as a last resort, since the normalized data should be
+ * maintained by the reducer result in state.
+ */
+const EMPTY_OBJECT = {};
+
 /**
  * Shared reference to an empty array for cases where it is important to avoid
  * returning a new array reference on every invocation, as in a connected or
@@ -688,7 +697,7 @@ export function hasRedo( state ) {
  * @return {Object} The current theme.
  */
 export function getCurrentTheme( state ) {
-	return state.themes[ state.currentTheme ];
+	return getEntityRecord( state, 'root', 'theme', state.currentTheme );
 }
 
 /**
@@ -710,7 +719,7 @@ export function __experimentalGetCurrentGlobalStylesId( state ) {
  * @return {*} Index data.
  */
 export function getThemeSupports( state ) {
-	return state.themeSupports;
+	return getCurrentTheme( state )?.theme_supports ?? EMPTY_OBJECT;
 }
 
 /**

packages/core-data/src/utils/forward-resolver.js

@@ -0,0 +1,14 @@
+/**
+ * Higher-order function which forward the resolution to another resolver with the same arguments.
+ *
+ * @param {string} resolverName forwarded resolver.
+ *
+ * @return {Function} Enhanced resolver.
+ */
+const forwardResolver = ( resolverName ) => ( ...args ) => async ( {
+	resolveSelect,
+} ) => {
+	await resolveSelect[ resolverName ]( ...args );
+};
+
+export default forwardResolver;

packages/core-data/src/utils/index.js

@@ -1,7 +1,7 @@
 export { default as conservativeMapItem } from './conservative-map-item';
 export { default as getNormalizedCommaSeparable } from './get-normalized-comma-separable';
 export { default as ifMatchingAction } from './if-matching-action';
-export { default as ifNotResolved } from './if-not-resolved';
+export { default as forwardResolver } from './forward-resolver';
 export { default as onSubKey } from './on-sub-key';
 export { default as replaceAction } from './replace-action';
 export { default as withWeakMapCache } from './with-weak-map-cache';