Hacktoberfest 2026:メンテナが10月に向けて印を付けた、オープンで初心者向けの issue。 Hacktoberfest の issue を見る

`overflow: scroll` is refused, though React Native's `overflow` takes it

オープン 初心者向け
#540 コメント 0 件 リアクション 0 件 担当者 0 名 GitHub で見る

メンテナーはふだん 3 日以内に返信

まだ誰も着手していません。

評価

難易度
2/5
見積もり時間
1〜3時間
初心者へのやさしさ
84/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
活発
技術スタック
react-native, typescript
領域
frontend

調査の方向性

src/compiler/declarations.ts の parseOverflow を読み、受け入れる値を React Native の FlexStyle["overflow"] と比較してください。issue に記載された再現テスト src/__tests__/native/overflow-scroll.test.tsx を実行して、現在の警告とスタイルが欠落していることを確認してください。overflow: scroll がレンダリングされたビューに渡り、auto や clip などの未対応の値が引き続き拒否されれば完了です。

索引モデルが issue の本文から書いたものです。

説明

Before submitting a new issue
  • I tested using the latest version of the library, as the bug might be already fixed.
  • I tested using a supported version of react native.
  • I checked for possible duplicate issues, with possible answers.
Bug summary

React Native's overflow takes visible, hidden and scroll (FlexStyle["overflow"]). The compiler refuses scroll with a warning, so overflow: scroll sets nothing, while visible and hidden pass.

The scroll case fails, the element receiving no style:

overflow: visible -> warnings {}
overflow: hidden -> warnings {}
overflow: scroll -> warnings {"values":{"overflow":["scroll"]}}

parseOverflow (src/compiler/declarations.ts) allows visible and hidden only. auto and clip have no React Native counterpart, so refusing them stays right.

Library version

main at 2421ea7 (0.0.0-nightly.2421ea7)

Environment info
System:
  OS: Windows 11 10.0.26300
  CPU: "(32) x64 AMD Ryzen 9 9950X3D 16-Core Processor          "
  Memory: 155.26 GB / 255.67 GB
Binaries:
  Node:
    version: 26.12.1
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 4.9.2
    path: C:\Users\<user>\AppData\Roaming\npm\yarn.CMD
  npm:
    version: 12.2.1
    path: C:\Program Files\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK:
    API Levels:
      - "33"
      - "35"
      - "35"
      - "35"
      - "36"
      - "37"
    Build Tools:
      - 35.0.0
      - 36.0.0
      - 36.1.0
      - 37.0.0
    System Images:
      - android-26 | Google APIs Intel x86_64 Atom
      - android-28 | Google APIs Intel x86_64 Atom
      - android-29 | Google APIs Intel x86_64 Atom
      - android-30 | Google APIs Intel x86_64 Atom
      - android-31 | Google APIs Intel x86_64 Atom
      - android-32 | Google APIs Intel x86_64 Atom
      - android-33 | Google APIs Intel x86_64 Atom
      - android-34 | Google APIs Intel x86_64 Atom
      - android-35 | Google APIs Intel x86_64 Atom
      - android-36.1 | Google Play Intel x86_64 Atom
      - android-36.1 | Pre-Release 16 KB Page Size Google Play Intel x86_64 Atom
      - android-37.0 | Google APIs Intel x86_64 Atom
    Android NDK: Not Found
  Windows SDK: Not Found
IDEs:
  Android Studio: AI-262.9437.185.2621.16467767
  Visual Studio: Not Found
Languages:
  Java:
    version: 17.0.20.1
    path: C:\Program Files\Microsoft\jdk-17.0.20.101-hotspot\bin\javac.EXE
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.86.3
    wanted: 0.86.3
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Steps to reproduce
  1. Clone the reproducer branch, which is main at 2421ea7 with one file added, src/__tests__/native/overflow-scroll.test.tsx, and install:
    git clone --branch repro/540-refused-miskeyed-values https://github.com/YevheniiKotyrlo/react-native-css
    cd react-native-css
    yarn install
    
  2. Run yarn jest src/__tests__/native/overflow-scroll.test.tsx.

src/__tests__/native/overflow-scroll.test.tsx:

import { render, screen } from "@testing-library/react-native";
import { View } from "react-native-css/components/View";
import { compile } from "react-native-css/compiler";
import { registerCSS, testID } from "react-native-css/jest";

test.each(["visible", "hidden", "scroll"])("overflow: %s reaches React Native", (value) => {
  console.log(`overflow: ${value} -> warnings ${JSON.stringify(compile(`.a { overflow: ${value}; }`).warnings())}`);
  registerCSS(`.a { overflow: ${value}; }`);
  render(<View testID={testID} className="a" />);
  expect(screen.getByTestId(testID).props.style).toStrictEqual({ overflow: value });
});

Expected: overflow: scroll sets overflow: "scroll", which React Native's overflow takes.

Actual: it is refused with a warning and sets nothing.

The run's output on main at 2421ea7, Windows 11, Node 26.12.1
  console.log
    overflow: visible -> warnings {}
      at log (src/__tests__/native/overflow-scroll.test.tsx:7:11)
  console.log
    overflow: hidden -> warnings {}
      at log (src/__tests__/native/overflow-scroll.test.tsx:7:11)
  console.log
    overflow: scroll -> warnings {"values":{"overflow":["scroll"]}}
      at log (src/__tests__/native/overflow-scroll.test.tsx:7:11)
FAIL src/__tests__/native/overflow-scroll.test.tsx
  √ overflow: visible reaches React Native (25 ms)
  √ overflow: hidden reaches React Native (5 ms)
  × overflow: scroll reaches React Native (2 ms)
  ● overflow: scroll reaches React Native
    expect(received).toStrictEqual(expected) // deep equality
    Expected: {"overflow": "scroll"}
    Received: undefined
       8 |   registerCSS(`.a { overflow: ${value}; }`);
       9 |   render(<View testID={testID} className="a" />);
    > 10 |   expect(screen.getByTestId(testID).props.style).toStrictEqual({ overflow: value });
         |                                                  ^
      11 | });
      12 | 
      at toStrictEqual (src/__tests__/native/overflow-scroll.test.tsx:10:50)
Test Suites: 1 failed, 1 total
Tests:       1 failed, 2 passed, 3 total
Snapshots:   0 total
Time:        1.077 s, estimated 2 s
Ran all test suites matching /src\\__tests__\\native\\overflow-scroll.test.tsx/i.
Reproducible example repository

https://github.com/YevheniiKotyrlo/react-native-css/tree/repro/540-refused-miskeyed-values

主要言語
TypeScript
スター
166
フォーク
45
平均マージ
13日 14時間
マージ済み PR(30日)
1

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