feat: live updates

packages/core/package.json

@@ -25,7 +25,7 @@
     "prepublishOnly": "yarn build ",
     "prepack": "cp ../../README.md ./",
     "postpack": "rm ./README.md",
-    "serve": "webpack serve",
+    "serve": "webpack serve --config-name configMain",
     "test": "cross-env NODE_ENV=test jest",
     "test:integration": "cross-env NODE_ENV=test jest -c jest.config.integration.js",
     "test:ci": "cross-env NODE_ENV=test jest --maxWorkers=2 --coverage",

packages/core/src/components/entry-editor/Editor.tsx

@@ -212,7 +212,6 @@ const Editor: FC<TranslatedProps<EditorProps>> = ({
   }, [collection, createBackup, entryDraft.entry, hasChanged]);
 
   useEntryCallback({
-    hasChanged,
     collection,
     slug,
     callback: () => {

packages/core/src/components/entry-editor/editor-preview-pane/EditorPreviewPane.tsx

@@ -186,7 +186,10 @@ const EditorPreviewPane = (props: TranslatedProps<EditorPreviewPaneProps>) => {
   const livePreviewIframe = useRef<HTMLIFrameElement>(null);
   const passEventToIframe = useCallback((event: DataUpdateEvent) => {
     if (livePreviewIframe.current) {
-      livePreviewIframe.current.contentWindow?.postMessage(event);
+      livePreviewIframe.current.contentWindow?.postMessage({
+        message: 'data:update',
+        value: { fieldPath: event.detail.fieldPath, value: event.detail.value },
+      });
     }
   }, []);
 

packages/core/src/components/index.tsx

@@ -1 +0,0 @@
-export * from './live';

packages/core/src/index.ts

@@ -16,7 +16,6 @@ import Registry from './lib/registry';
 
 export * from './backends';
 export * from './interface';
-export * from './components';
 export * from './lib';
 export { default as locales } from './locales';
 export * from './widgets';

packages/core/src/lib/hooks/useData.tsx

@@ -1,23 +1,29 @@
-import { useCallback, useEffect, useState } from 'react';
+import { useCallback, useEffect, useMemo, useState } from 'react';
-import { useSearchParams } from 'react-router-dom';
 
 import type { ValueOrNestedValue } from '@staticcms/core/interface';
-import type DataUpdateEvent from '../util/events/DataEvent';
 
 export default function useData(value: ValueOrNestedValue, path: string) {
   const [data, setData] = useState(value);
 
-  const [searchParams] = useSearchParams();
+  const isCms = useMemo(() => {
-  const isCms = searchParams.get('useCmsData') === 'true';
+    if (!window) {
+      return false;
+    }
+
+    const searchParams = new URLSearchParams(window.location.search);
+    return searchParams.get('useCmsData') === 'true';
+  }, []);
 
   const onDataChange = useCallback(
-    (event: DataUpdateEvent) => {
+    (event: MessageEvent) => {
-      if (!isCms) {
+      if (!isCms || event.data.message !== 'data:update') {
         return;
       }
 
-      if (event.detail.fieldPath === path) {
+      const { fieldPath, value } = event.data.value;
-        setData(event.detail.value);
+
+      if (fieldPath === path) {
+        setData(value);
       }
     },
     [isCms, path],
@@ -28,10 +34,10 @@ export default function useData(value: ValueOrNestedValue, path: string) {
       return;
     }
 
-    window.addEventListener('data:update', onDataChange);
+    window?.addEventListener('message', onDataChange);
 
     return () => {
-      window.removeEventListener('data:update', onDataChange);
+      window?.removeEventListener('message', onDataChange);
     };
   }, [isCms, onDataChange]);
 

packages/core/src/lib/hooks/useEntryCallback.ts

@@ -63,18 +63,12 @@ async function handleChange(
 }
 
 interface EntryCallbackProps {
-  hasChanged: boolean;
   collection: Collection;
   slug: string | undefined;
   callback: () => void;
 }
 
-export default function useEntryCallback({
+export default function useEntryCallback({ slug, collection, callback }: EntryCallbackProps) {
-  hasChanged,
-  slug,
-  collection,
-  callback,
-}: EntryCallbackProps) {
   const dispatch = useAppDispatch();
 
   const entry = useAppSelector(selectEditingDraft);
@@ -85,7 +79,7 @@ export default function useEntryCallback({
       return;
     }
 
-    if (hasChanged && entry) {
+    if (entry) {
       const file = fileForEntry(collection, slug);
       let updatedEntryData = entry.data;
 
@@ -121,9 +115,9 @@ export default function useEntryCallback({
       setLastEntryData(entry?.data);
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [entry, hasChanged]);
+  }, [entry]);
 
-  const debouncedRunUpdateCheck = useDebouncedCallback(runUpdateCheck, 500);
+  const debouncedRunUpdateCheck = useDebouncedCallback(runUpdateCheck, 200);
 
   useEffect(() => {
     debouncedRunUpdateCheck();

packages/core/src/live/Data.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 
-import { useData } from '@staticcms/core/lib';
+import useData from '@staticcms/core/lib/hooks/useData';
 
 import type { ValueOrNestedValue } from '@staticcms/core/interface';
 import type { FC } from 'react';
@@ -12,7 +12,6 @@ export interface DataProps {
 
 const Data: FC<DataProps> = ({ path, value }) => {
   const data = useData(value, path);
-
   return <>{data}</>;
 };
 

packages/core/webpack.config.js

@@ -12,8 +12,7 @@ function moduleNameToPath(libName) {
   return path.resolve(__dirname, '..', '..', 'node_modules', libName);
 }
 
-module.exports = {
+const config = {
-  entry: './src/index.ts',
   mode: isProduction ? 'production' : 'development',
   devtool: 'source-map',
   externals: isProduction
@@ -107,15 +106,6 @@ module.exports = {
       STATIC_CMS_CORE_VERSION: JSON.stringify(`${pkg.version}${isProduction ? '' : '-dev'}`),
     }),
   ].filter(Boolean),
-  output: {
-    publicPath: '',
-    path: path.resolve(__dirname, 'dist'),
-    filename: 'static-cms-core.js',
-    library: {
-      name: 'StaticCmsCore',
-      type: 'umd',
-    },
-  },
   devServer: {
     static: {
       directory: './dev-test',
@@ -126,3 +116,33 @@ module.exports = {
     hot: true,
   },
 };
+
+const configLive = Object.assign({}, config, {
+  name: "configLive",
+  entry: './src/live/index.ts',
+  output: {
+    publicPath: '',
+    path: path.resolve(__dirname, 'dist'),
+    filename: 'live.js',
+    library: {
+      name: 'StaticCmsCoreLive',
+      type: 'umd',
+    },
+  }
+});
+
+const configMain = Object.assign({}, config, {
+  name: "configMain",
+  entry: './src/index.ts',
+  output: {
+    publicPath: '',
+    path: path.resolve(__dirname, 'dist'),
+    filename: 'static-cms-core.js',
+    library: {
+      name: 'StaticCmsCore',
+      type: 'umd',
+    },
+  }
+});
+
+module.exports = [configMain, configLive]