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overflow: scroll is refused, though React Native's overflow takes it #540
Description
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 foundSteps to reproduce
- Clone the reproducer branch, which is
mainat 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 - 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
Activity