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A runtime calc() drops infinity: width: var(--r) over --r: calc(infinity * 1px) renders nothing #538
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
parseCalcArguments (src/compiler/declarations.ts) drops the infinity ident, so a calc() the runtime resolves loses it: a kept --r: calc(infinity * 1px) compiles to [{}, "calc", ["*", 1]] and resolves to nothing, for every unit. The same sheet with the variable inlined renders the clamped length.
Inlined, the width is the clamped length; kept, the style is empty:
inlineVariables=true: {"width":9007199254740991}
inlineVariables=false: {}
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/infinite-runtime-calc.test.tsx, and install:git clone --branch repro/538-runtime-calc-drops-infinity https://github.com/YevheniiKotyrlo/react-native-css cd react-native-css yarn install - Run
yarn jest src/__tests__/native/infinite-runtime-calc.test.tsx.
src/__tests__/native/infinite-runtime-calc.test.tsx:
import { render, screen } from "@testing-library/react-native";
import { View } from "react-native-css/components/View";
import { registerCSS, testID } from "react-native-css/jest";
test.each([true, false])(
"width: var(--r) over --r: calc(infinity * 1px) is the clamped length (inlineVariables: %s)",
(inlineVariables) => {
registerCSS(".a { --r: calc(infinity * 1px); width: var(--r); }", inlineVariables ? {} : { inlineVariables: false });
render(<View testID={testID} className="a" />);
const { style } = screen.getByTestId(testID).props;
console.log(`inlineVariables=${inlineVariables}: ${JSON.stringify(style)}`);
expect(Number.isFinite(style?.width)).toBe(true);
},
);Expected: width: var(--r) over --r: calc(infinity * 1px) renders the clamped length, as the sheet with the variable inlined does.
Actual: it renders nothing, for every unit.
The run's output on main at 2421ea7, Windows 11, Node 26.12.1
console.log
inlineVariables=true: {"width":9007199254740991}
at log (src/__tests__/native/infinite-runtime-calc.test.tsx:11:13)
console.log
inlineVariables=false: {}
at log (src/__tests__/native/infinite-runtime-calc.test.tsx:11:13)
FAIL src/__tests__/native/infinite-runtime-calc.test.tsx
√ width: var(--r) over --r: calc(infinity * 1px) is the clamped length (inlineVariables: true) (27 ms)
× width: var(--r) over --r: calc(infinity * 1px) is the clamped length (inlineVariables: false) (8 ms)
● width: var(--r) over --r: calc(infinity * 1px) is the clamped length (inlineVariables: false)
expect(received).toBe(expected) // Object.is equality
Expected: true
Received: false
10 | const { style } = screen.getByTestId(testID).props;
11 | console.log(`inlineVariables=${inlineVariables}: ${JSON.stringify(style)}`);
> 12 | expect(Number.isFinite(style?.width)).toBe(true);
| ^
13 | },
14 | );
15 |
at toBe (src/__tests__/native/infinite-runtime-calc.test.tsx:12:43)
Test Suites: 1 failed, 1 total
Tests: 1 failed, 1 passed, 2 total
Snapshots: 0 total
Time: 1.077 s, estimated 2 s
Ran all test suites matching /src\\__tests__\\native\\infinite-runtime-calc.test.tsx/i.
Reproducible example repository
https://github.com/YevheniiKotyrlo/react-native-css/tree/repro/538-runtime-calc-drops-infinity
Activity