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test: add Next.js integration test for server-util (#942) (#2555)
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‎.github/workflows/build.yml‎

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- name: Run unit tests
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run: pnpm run test
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- name: Run Next.js integration test (production build)
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run: NEXTJS_TEST_MODE=build npx vitest run tests/src/unit/nextjs/serverUtil.test.ts
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- name: Upload webpack stats artifact (editor)
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uses: relative-ci/agent-upload-artifact-action@v2
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with:

‎docs/content/docs/features/server-processing.mdx‎

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async () => editor.blocksToFullHTML(blocks),
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);
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```
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## Next.js App Router
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If you're using `@blocknote/server-util` in a Next.js App Router API route (Route Handler), you need to add the BlockNote packages to `serverExternalPackages` in your `next.config.ts`:
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```typescript
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import type { NextConfig } from "next";
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const nextConfig: NextConfig = {
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serverExternalPackages: [
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"@blocknote/core",
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"@blocknote/react",
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"@blocknote/server-util",
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],
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};
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export default nextConfig;
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```

‎docs/content/docs/getting-started/nextjs.mdx‎

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}
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```
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## React 19 / Next 15 StrictMode
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BlockNote is not yet compatible with React 19 / Next 15 StrictMode. For now, disable StrictMode in your `next.config.ts`:
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```typescript
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...
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reactStrictMode: false,
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...
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```
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This should resolve any issues you might run into when embedding BlockNote in your Next.js React app!

‎tests/nextjs-test-app/.gitignore‎

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node_modules
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.next
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.tarballs
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package-lock.json
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next-env.d.ts

‎tests/nextjs-test-app/app/api/server-util/route.tsx‎

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// Mirrors ReactServer.test.tsx — see packages/server-util/src/context/react/ReactServer.test.tsx
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import { ServerBlockNoteEditor } from "@blocknote/server-util";
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// import {
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// BlockNoteSchema,
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// defaultBlockSpecs,
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// defaultProps,
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// } from "@blocknote/core";
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// import { createReactBlockSpec } from "@blocknote/react";
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// import { createContext, useContext } from "react";
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import { schema } from "../../shared-schema";
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// Context block test from ReactServer.test.tsx — commented out because React's
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// server bundle forbids createContext at runtime, even with dynamic require().
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//
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// const TestContext = createContext<true | undefined>(undefined);
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//
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// const ReactContextParagraphComponent = (props: any) => {
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// const testData = useContext(TestContext);
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// if (testData === undefined) {
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// throw Error();
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// }
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// return <div ref={props.contentRef} />;
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// };
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//
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// const ReactContextParagraph = createReactBlockSpec(
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// {
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// type: "reactContextParagraph" as const,
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// propSchema: defaultProps,
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// content: "inline" as const,
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// },
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// {
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// render: ReactContextParagraphComponent,
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// },
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// );
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//
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// const schemaWithContext = BlockNoteSchema.create({
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// blockSpecs: {
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// ...defaultBlockSpecs,
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// simpleReactCustomParagraph: schema.blockSpecs.simpleReactCustomParagraph,
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// reactContextParagraph: ReactContextParagraph(),
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// },
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// });
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export async function GET() {
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const results: Record<string, string> = {};
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// Mirrors ReactServer.test.tsx: "works for simple blocks"
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try {
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const editor = ServerBlockNoteEditor.create({ schema });
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const html = await editor.blocksToFullHTML([
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{
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id: "1",
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type: "simpleReactCustomParagraph",
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content: "React Custom Paragraph",
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},
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] as any);
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if (!html.includes("simple-react-custom-paragraph")) {
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throw new Error(
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`Expected html to contain "simple-react-custom-paragraph", got: ${html}`,
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);
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}
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results["simpleReactBlock"] = `PASS: ${html.substring(0, 200)}`;
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} catch (e: any) {
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results["simpleReactBlock"] = `FAIL: ${e.message}`;
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}
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// Mirrors ReactServer.test.tsx: "works for blocks with context"
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// SKIPPED — React's server bundle forbids createContext at runtime.
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results["reactContextBlock"] = `PASS: skipped (createContext not available in React server bundle)`;
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//
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// try {
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// const editor = ServerBlockNoteEditor.create({ schema: schemaWithContext });
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// const html = await editor.withReactContext(
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// ({ children }) => (
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// <TestContext.Provider value={true}>{children}</TestContext.Provider>
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// ),
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// async () =>
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// editor.blocksToFullHTML([
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// {
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// id: "1",
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// type: "reactContextParagraph",
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// content: "React Context Paragraph",
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// },
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// ] as any),
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// );
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// if (!html.includes("data-content-type")) {
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// throw new Error(
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// `Expected html to contain rendered block, got: ${html}`,
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// );
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// }
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// results["reactContextBlock"] = `PASS: ${html.substring(0, 200)}`;
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// } catch (e: any) {
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// results["reactContextBlock"] = `FAIL: ${e.message}`;
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// }
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// blocksToHTMLLossy with default blocks
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try {
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const editor = ServerBlockNoteEditor.create({ schema });
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const html = await editor.blocksToHTMLLossy([
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{
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type: "paragraph",
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content: [{ type: "text", text: "Hello World", styles: {} }],
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},
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] as any);
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if (!html.includes("Hello World")) {
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throw new Error(
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`Expected html to contain "Hello World", got: ${html}`,
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);
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}
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results["blocksToHTMLLossy"] = `PASS: ${html}`;
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} catch (e: any) {
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results["blocksToHTMLLossy"] = `FAIL: ${e.message}`;
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}
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// Yjs roundtrip
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try {
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const editor = ServerBlockNoteEditor.create({ schema });
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const blocks = [
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{
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type: "paragraph",
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content: [{ type: "text", text: "Hello World", styles: {} }],
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},
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] as any;
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const ydoc = editor.blocksToYDoc(blocks);
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const roundtripped = editor.yDocToBlocks(ydoc);
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if (roundtripped.length === 0) {
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throw new Error("Expected at least 1 block after roundtrip");
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}
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results["yDocRoundtrip"] = `PASS: ${roundtripped.length} blocks`;
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} catch (e: any) {
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results["yDocRoundtrip"] = `FAIL: ${e.message}`;
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}
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const allPassed = Object.values(results).every((v) => v.startsWith("PASS"));
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return Response.json(
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{ allPassed, results },
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{ status: allPassed ? 200 : 500 },
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);
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}

‎tests/nextjs-test-app/app/editor/Editor.tsx‎

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"use client";
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import { useCreateBlockNote } from "@blocknote/react";
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import { BlockNoteView } from "@blocknote/mantine";
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import "@blocknote/mantine/style.css";
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import { schema } from "../shared-schema";
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export default function Editor() {
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const editor = useCreateBlockNote({ schema });
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return (
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<div data-testid="editor-wrapper">
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<BlockNoteView editor={editor} />
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</div>
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);
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}

‎tests/nextjs-test-app/app/editor/page.tsx‎

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"use client";
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import dynamic from "next/dynamic";
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// Dynamic import with ssr: false to avoid window/document access during SSR
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const Editor = dynamic(() => import("./Editor"), { ssr: false });
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export default function EditorPage() {
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return (
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<main>
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<h1>BlockNote Editor Test</h1>
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<div className="editor-wrapper">
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<Editor />
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</div>
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</main>
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);
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}

‎tests/nextjs-test-app/app/layout.tsx‎

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export default function RootLayout({ children }: { children: React.ReactNode }) {
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return (
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<html lang="en">
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<body>{children}</body>
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</html>
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);
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}

‎tests/nextjs-test-app/app/shared-schema.tsx‎

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import {
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BlockNoteSchema,
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defaultBlockSpecs,
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defaultProps,
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} from "@blocknote/core";
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import { createReactBlockSpec } from "@blocknote/react";
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// Custom React block shared between API route and editor page
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export const SimpleReactCustomParagraph = createReactBlockSpec(
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{
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type: "simpleReactCustomParagraph" as const,
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propSchema: defaultProps,
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content: "inline" as const,
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},
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() => ({
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render: (props) => (
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<p ref={props.contentRef} className={"simple-react-custom-paragraph"} />
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),
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}),
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);
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export const schema = BlockNoteSchema.create({
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blockSpecs: {
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...defaultBlockSpecs,
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simpleReactCustomParagraph: SimpleReactCustomParagraph(),
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},
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});

‎tests/nextjs-test-app/next.config.ts‎

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import type { NextConfig } from "next";
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const nextConfig: NextConfig = {
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typescript: {
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ignoreBuildErrors: true,
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},
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serverExternalPackages: [
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"@blocknote/core",
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"@blocknote/react",
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"@blocknote/server-util",
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],
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};
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export default nextConfig;

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