[Bug] 'env' does not exist in type 'StorybookConfig'

[zigang93]

Describe the bug

// main.ts

import type { StorybookConfig } from '@storybook/nextjs'

const config: StorybookConfig = {
  stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|ts|tsx)'],
  staticDirs: ['../public'],
  addons: [
    'storybook-dark-mode',
    '@storybook/addon-links',
    '@storybook/addon-essentials',
    '@storybook/addon-interactions',
  ],
  core: {
    disableTelemetry: true,
  },
  framework: {
    name: '@storybook/nextjs',
    options: {
      strictMode: true,
    },
  },
  docs: {
    // see below for alternatives
    defaultName: 'Docs',
    // set to change the name of generated docs entries
    autodocs: true,
  },
// error happened at here
  env: (config: any) => ({
    ...config,
    NEXT_PUBLIC_WCS_BE_API_HOST_URL: 'https://example.com/',
    // fake https for chromatic deployment
    NEXT_PUBLIC_QIII_SOCKET_URL: 'https://socket.example.com',
  }),
}
module.exports = config

show error:

Type '{ stories: string[]; staticDirs: string[]; addons: string[]; core: { disableTelemetry: true; }; framework: { name: "@storybook/nextjs"; options: { strictMode: true; }; }; docs: { defaultName: string; autodocs: true; }; env: (config: any) => any; }' is not assignable to type 'StorybookConfig'.
  Object literal may only specify known properties, and 'env' does not exist in type 'StorybookConfig'.

To Reproduce

No response

System

System:
    OS: macOS 13.2.1
    CPU: (8) arm64 Apple M1
  Binaries:
    Node: 16.14.0 - ~/.nvm/versions/node/v16.14.0/bin/node
    npm: 8.3.1 - ~/.nvm/versions/node/v16.14.0/bin/npm
  Browsers:
    Chrome: 111.0.5563.64
    Safari: 16.3
  npmPackages:
    @storybook/addon-actions: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/addon-essentials: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/addon-interactions: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/addon-links: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/csf: 0.0.2-next.10 => 0.0.2-next.10 
    @storybook/nextjs: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/react: ^7.0.0-rc.5 => 7.0.0-rc.5 
    @storybook/testing-library: ^0.0.14-next.1 => 0.0.14-next.1 
    @storybook/theming: ^7.0.0-rc.5 => 7.0.0-rc.5

Additional context

No response

[shilman]

Yippee!! I just released https://github.com/storybookjs/storybook/releases/tag/v7.0.0-rc.8 containing PR #21732 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb@next upgrade --prerelease