Add playground

.github/workflows/playground.yml

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+name: Deploy static content to Pages
+on:
+  push:
+    branches: ['main']
+  workflow_dispatch:
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+concurrency:
+  group: 'pages'
+  cancel-in-progress: true
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./playground
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+      - name: Install dependencies
+        run: npm ci
+      - name: Build
+        run: npm run build
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './dist'
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

playground/App.tsx

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+import { jsonSchemaFromGraphQlType } from "@acomagu/graphql-to-json-schema";
+import { CodeHighlight } from '@mantine/code-highlight';
+import '@mantine/code-highlight/styles.css';
+import {
+  ActionIcon,
+  AppShell,
+  Code,
+  Divider,
+  Flex,
+  Group,
+  Input,
+  ScrollArea,
+  Select,
+  Stack,
+  Textarea,
+  Title,
+  useComputedColorScheme,
+  useMantineColorScheme
+} from '@mantine/core';
+import '@mantine/core/styles.css';
+import { IconBrandGithub, IconMoon, IconSun } from '@tabler/icons-react';
+import * as graphql from 'graphql';
+import { useState } from "react";
+
+const sampleGqlSchema = `
+type Query {
+  campaign: Campaign
+}
+
+type Campaign {
+  created_at: DateTime!
+  description: String
+  end: DateTime
+  id: ID!
+  locale: String
+  localizations(
+    sort: String
+    limit: Int
+    start: Int
+    where: JSON
+  ): [Campaign]
+  name: String
+  start: DateTime
+  updated_at: DateTime!
+}
+
+scalar DateTime
+scalar JSON
+`.trim();
+
+function TypeNameSelect(props: {
+  gqlSchemaInput: string;
+  value: string | undefined;
+  onChange: (v: string | undefined) => void;
+}) {
+  let schema: graphql.GraphQLSchema;
+  try {
+    schema = graphql.buildSchema(props.gqlSchemaInput);
+  } catch (e) {
+    return;
+  }
+  const types = Object.values(schema.getTypeMap());
+  const objectTypes = types.filter(t => graphql.isObjectType(t));
+  const typeNameCandidates = objectTypes.map(t => t.name).filter(name => !name.startsWith('__'));
+  return <Select label="Converted Type" data={typeNameCandidates} value={props.value ?? null} onChange={v => props.onChange(v ?? undefined)} />;
+}
+
+function Playground() {
+  const [gqlSchemaStr, setGqlSchemaStr] = useState<string>(sampleGqlSchema);
+  const [typeName, setTypeName] = useState<string | undefined>('Query');
+
+  return <Flex h="100%">
+    <Stack h="100%" flex={1}>
+      <Textarea
+        flex={1}
+        label="GraphQL Schema"
+        placeholder="Input complete GraphQL Schema"
+        spellCheck={false}
+        styles={{
+          root: {
+            flexDirection: 'column',
+            display: 'flex',
+          },
+          wrapper: {
+            flex: 1,
+          },
+          input: {
+            height: '100%',
+          },
+        }}
+        value={gqlSchemaStr}
+        onChange={ev => setGqlSchemaStr(ev.target.value)}
+      ></Textarea>
+      <TypeNameSelect gqlSchemaInput={gqlSchemaStr} value={typeName} onChange={setTypeName} />
+    </Stack>
+    <Divider orientation="vertical" ml="lg" mr="lg" />
+    <ScrollArea flex={1}>
+      <Result gqlSchemaInput={gqlSchemaStr} convertedTypeName={typeName} />
+    </ScrollArea>
+  </Flex>;
+}
+
+function Result(props: { gqlSchemaInput: string, convertedTypeName: string | undefined }) {
+  let gqlSchema: graphql.GraphQLSchema;
+  try {
+    gqlSchema = graphql.buildSchema(props.gqlSchemaInput);
+  } catch (e) {
+    const error = (e as Error).message;
+    return <Code block c="var(--mantine-color-red-9)">
+      {error}
+    </Code>;
+  }
+  if (!props.convertedTypeName) return <>Please select type name.</>;
+
+  const type = gqlSchema.getType(props.convertedTypeName);
+  if (!graphql.isObjectType(type)) return <>This type is not Object type.</>;
+
+  const jsonSchema = jsonSchemaFromGraphQlType(type);
+
+  return <Input.Wrapper label="JSON Schema">
+    <CodeHighlight code={JSON.stringify(jsonSchema, null, 1)} language="json" withCopyButton={false} />
+  </Input.Wrapper>;
+}
+
+function ColorSchemeToggleSwitch() {
+  const { setColorScheme } = useMantineColorScheme();
+  const computedColorScheme = useComputedColorScheme('light', { getInitialValueInEffect: true });
+  const Icon = computedColorScheme === 'light' ? IconMoon : IconSun;
+
+  return (
+    <ActionIcon
+      onClick={() => setColorScheme(computedColorScheme === 'light' ? 'dark' : 'light')}
+      variant="default"
+      size="lg"
+      aria-label="Toggle color scheme"
+    >
+      <Icon />
+    </ActionIcon>
+  );
+}
+
+export function App() {
+  return <AppShell
+    header={{ height: 60 }}
+    padding="lg"
+  >
+    <AppShell.Header ps="lg" pe="lg">
+      <Group justify="space-between">
+        <Title order={1} lh="60px" fw="normal">GraphQL to JSON Schema Playground</Title>
+        <Group>
+          <ActionIcon
+            component="a"
+            href="https://github.com/acomagu/graphql-to-json-schema"
+            variant="default"
+            size="lg"
+            aria-label="GitHub Link"
+          >
+            <IconBrandGithub />
+          </ActionIcon>
+          <ColorSchemeToggleSwitch />
+        </Group>
+      </Group>
+    </AppShell.Header>
+    <AppShell.Main h="1px">{/* https://stackoverflow.com/a/21836870/8182174 */}
+      <Playground />
+    </AppShell.Main>
+  </AppShell>;
+}

playground/dist/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>GraphQL To JSON Schema Playground</title>
+    <script type="module" crossorigin src="/assets/index-DECt5bh1.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-CwWoUEoH.css">
+  </head>
+
+  <body>
+    <div id="app"></div>
+  </body>
+</html>

playground/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>GraphQL To JSON Schema Playground</title>
+  </head>
+
+  <body>
+    <div id="app"></div>
+    <script type="module" src="main.tsx"></script>
+  </body>
+</html>

playground/main.tsx

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+import { MantineProvider } from '@mantine/core';
+import * as React from 'react';
+import { createRoot } from "react-dom/client";
+import { App } from './App.js';
+
+createRoot(document.querySelector('#app')!).render(
+  <React.StrictMode>
+    <MantineProvider defaultColorScheme='auto'>
+      <App />
+    </MantineProvider>
+  </React.StrictMode>,
+);