Update CLI templates to TS 4.9

code/frameworks/nextjs/template/cli/ts-legacy/Button.stories.ts

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+import type { Meta, StoryObj } from '@storybook/react';
+
+import { Button } from './Button';
+
+// More on how to set up stories at: https://storybook.js.org/docs/7.0/react/writing-stories/introduction
+const meta: Meta<typeof Button> = {
+  title: 'Example/Button',
+  component: Button,
+  tags: ['docsPage'],
+  argTypes: {
+    backgroundColor: {
+      control: 'color',
+    },
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof Button>;
+
+// More on writing stories with args: https://storybook.js.org/docs/7.0/react/writing-stories/args
+export const Primary: Story = {
+  args: {
+    primary: true,
+    label: 'Button',
+  },
+};
+
+export const Secondary: Story = {
+  args: {
+    label: 'Button',
+  },
+};
+
+export const Large: Story = {
+  args: {
+    size: 'large',
+    label: 'Button',
+  },
+};
+
+export const Small: Story = {
+  args: {
+    size: 'small',
+    label: 'Button',
+  },
+};

code/frameworks/nextjs/template/cli/ts-legacy/Button.tsx

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+import React from 'react';
+import './button.css';
+
+interface ButtonProps {
+  /**
+   * Is this the principal call to action on the page?
+   */
+  primary?: boolean;
+  /**
+   * What background color to use
+   */
+  backgroundColor?: string;
+  /**
+   * How large should the button be?
+   */
+  size?: 'small' | 'medium' | 'large';
+  /**
+   * Button contents
+   */
+  label: string;
+  /**
+   * Optional click handler
+   */
+  onClick?: () => void;
+}
+
+/**
+ * Primary UI component for user interaction
+ */
+export const Button = ({
+  primary = false,
+  size = 'medium',
+  backgroundColor,
+  label,
+  ...props
+}: ButtonProps) => {
+  const mode = primary ? 'storybook-button--primary' : 'storybook-button--secondary';
+  return (
+    <button
+      type="button"
+      className={['storybook-button', `storybook-button--${size}`, mode].join(' ')}
+      {...props}
+    >
+      {label}
+      <style jsx>{`
+        button {
+          background-color: ${backgroundColor};
+        }
+      `}</style>
+    </button>
+  );
+};

code/frameworks/nextjs/template/cli/ts-legacy/Header.stories.ts

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+import type { Meta, StoryObj } from '@storybook/react';
+import { Header } from './Header';
+
+const meta: Meta<typeof Header> = {
+  title: 'Example/Header',
+  component: Header,
+  // This component will have an automatically generated docsPage entry: https://storybook.js.org/docs/7.0/react/writing-docs/docs-page
+  tags: ['docsPage'],
+  parameters: {
+    // More on how to position stories at: https://storybook.js.org/docs/7.0/react/configure/story-layout
+    layout: 'fullscreen',
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof Header>;
+
+export const LoggedIn: Story = {
+  args: {
+    user: {
+      name: 'Jane Doe',
+    },
+  },
+};
+
+export const LoggedOut: Story = {};

code/frameworks/nextjs/template/cli/ts-legacy/Header.tsx

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+import React from 'react';
+
+import { Button } from './Button';
+import './header.css';
+
+type User = {
+  name: string;
+};
+
+interface HeaderProps {
+  user?: User;
+  onLogin: () => void;
+  onLogout: () => void;
+  onCreateAccount: () => void;
+}
+
+export const Header = ({ user, onLogin, onLogout, onCreateAccount }: HeaderProps) => (
+  <header>
+    <div className="wrapper">
+      <div>
+        <svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+          <g fill="none" fillRule="evenodd">
+            <path
+              d="M10 0h12a10 10 0 0110 10v12a10 10 0 01-10 10H10A10 10 0 010 22V10A10 10 0 0110 0z"
+              fill="#FFF"
+            />
+            <path
+              d="M5.3 10.6l10.4 6v11.1l-10.4-6v-11zm11.4-6.2l9.7 5.5-9.7 5.6V4.4z"
+              fill="#555AB9"
+            />
+            <path
+              d="M27.2 10.6v11.2l-10.5 6V16.5l10.5-6zM15.7 4.4v11L6 10l9.7-5.5z"
+              fill="#91BAF8"
+            />
+          </g>
+        </svg>
+        <h1>Acme</h1>
+      </div>
+      <div>
+        {user ? (
+          <>
+            <span className="welcome">
+              Welcome, <b>{user.name}</b>!
+            </span>
+            <Button size="small" onClick={onLogout} label="Log out" />
+          </>
+        ) : (
+          <>
+            <Button size="small" onClick={onLogin} label="Log in" />
+            <Button primary size="small" onClick={onCreateAccount} label="Sign up" />
+          </>
+        )}
+      </div>
+    </div>
+  </header>
+);