Webpack5: Cannot find module @storybook/semver

[mjchang]

Describe the bug
Got this build error when testing the webpack 5 release

> start-storybook -p 6006

info @storybook/react v6.2.0-alpha.31
info => Loading presets
WARN   Failed to load preset: "/Users/chang/frontend/node_modules/@storybook/builder-webpack5/dist/cjs/presets/preview-preset.js"
ERR! Error: Cannot find module '@storybook/semver/package.json'
ERR! Require stack:
ERR! - /Users/chang/frontend/node_modules/@storybook/builder-webpack5/dist/cjs/preview/iframe-webpack.config.js
ERR! - /Users/chang/frontend/node_modules/@storybook/builder-webpack5/dist/cjs/presets/preview-preset.js
ERR! - /Users/chang/frontend/node_modules/@storybook/core-common/dist/cjs/presets.js
ERR! - /Users/chang/frontend/node_modules/@storybook/core-common/dist/cjs/index.js
ERR! - /Users/chang/frontend/node_modules/@storybook/core-server/dist/cjs/index.js
ERR! - /Users/chang/frontend/node_modules/@storybook/core/dist/cjs/server.js
ERR! - /Users/chang/frontend/node_modules/@storybook/core/server.js
ERR! - /Users/chang/frontend/node_modules/@storybook/react/dist/cjs/server/index.js
ERR! - /Users/chang/frontend/node_modules/@storybook/react/bin/index.js

WARN Broken build, fix the error above.
WARN You may need to refresh the browser.

Essentially @storybook/semver is not installed. After installing, this error disappears. Previous versions didn't require me manually installing the package. Perhaps @storybook/semver is missing as a dependency from @storybook/builder-webpack5?

System

  System:
    OS: macOS 10.15.7
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  Binaries:
    Node: 12.17.0 - ~/.nvm/versions/node/v12.17.0/bin/node
    Yarn: 1.21.1 - /usr/local/bin/yarn
    npm: 6.14.4 - ~/.nvm/versions/node/v12.17.0/bin/npm
  Browsers:
    Chrome: 88.0.4324.182
    Edge: 88.0.705.74
    Firefox: 85.0.2
    Safari: 14.0
  npmPackages:
    @storybook/addon-essentials: 6.2.0-alpha.31 => 6.2.0-alpha.31
    @storybook/addon-storyshots: 6.2.0-alpha.31 => 6.2.0-alpha.31
    @storybook/addons: 6.2.0-alpha.31 => 6.2.0-alpha.31
    @storybook/builder-webpack5: 6.2.0-alpha.31 => 6.2.0-alpha.31
    @storybook/react: 6.2.0-alpha.31 => 6.2.0-alpha.31

[shilman]

Jiminy cricket!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.2.0-alpha.32 containing PR #13982 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.