storybookjs/storybook

[Bug]: Null can't show as a type with React/Vite/Typescript

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#32,106 opened on Jul 22, 2025

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 (2 comments) (3 reactions) (1 assignee)TypeScript (10,058 forks)batch import
argtypesbughelp wanted

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Description

Describe the bug

I expect to see string, null, and number as valid options but null is always removed. I've toggled every option I can find documentation for, but have not figured out how to get null to show.

Reproduction link

https://stackblitz.com/edit/github-fdkzfbvz?file=src%2Fstories%2FButton.tsx

Reproduction steps

  1. Go to above link
  2. See that it looks like screenshot above

System

Storybook Environment Info:

  System:
    OS: Windows 11 10.0.22621
    CPU: (24) x64 12th Gen Intel(R) Core(TM) i7-12850HX
  Binaries:
    Node: 22.16.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.9.2 - C:\Program Files\nodejs\npm.CMD <----- active
  Browsers:
    Edge: Chromium (136.0.3240.92)
  npmPackages:
    @storybook/addon-docs: ^9.0.18 => 9.0.18
    @storybook/addon-onboarding: ^9.0.18 => 9.0.18
    @storybook/react-vite: ^9.0.18 => 9.0.18
    eslint-plugin-storybook: ^9.0.18 => 9.0.18
    storybook: ^9.0.18 => 9.0.18

Additional context

No response

Contributor guide

Research direction
Inspect the code that parses prop types to ensure null values in union types are displayed correctly in controls.
Tech stack
reactvitetypescript
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60