add core extensions

packages/core/src/extensions/setContent.ts

@@ -0,0 +1,28 @@
+import { TextSelection } from 'prosemirror-state'
+import { Command } from '../Editor'
+import { createExtension } from '../Extension'
+
+export const SetContent = createExtension({
+  addCommands() {
+    return {
+      setContent: (content: string, emitUpdate: Boolean = false, parseOptions = {}): Command => ({ tr, editor }) => {
+        const { createDocument } = editor
+        const { doc } = tr
+        const document = createDocument(content, parseOptions)
+        const selection = TextSelection.create(doc, 0, doc.content.size)
+
+        tr.setSelection(selection)
+          .replaceSelectionWith(document, false)
+          .setMeta('preventUpdate', !emitUpdate)
+
+        return true
+      },
+    }
+  },
+})
+
+declare module '../Editor' {
+  interface AllExtensions {
+    SetContent: typeof SetContent,
+  }
+}