An attribute selector inside `:where()`, or a `:is()` of several, never matches: `.test:where([data-test="abc"])` styles nothing

Start in src/compiler/selector-builder.ts, especially parseIsWhereComponents, then read src/native/conditions/container-query.ts to trace how attribute conditions are evaluated. Run the reproducer test src/__tests__/native/attribute-query-in-is-where.test.tsx with the command in the issue. Done when the :where() and multi-selector :is() cases match the element's own attributes while the non-match and single-selector cases still pass.

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

An attribute selector inside :where(), or inside an :is() of more than one selector, never matches: .test:where([data-test="abc"]) styles nothing on dataSet={{ test: "abc" }}, and so does .test:is([data-test="abc"], [data-other="xyz"]). A browser matches both. A single-selector :is([data-test="abc"]) works, because lightningcss flattens it into the rule's own attribute list before the compiler sees it.

The first and third cases fail; the second, a correct non-match, and the fourth pass.

parseIsWhereComponents turns each :is() or :where() branch into a container query, so the attribute test lands on a container query, which src/native/conditions/container-query.ts checks against a container's props rather than the element's own.

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/attribute-query-in-is-where.test.tsx, and install:

   git clone --branch repro/541-is-where-attribute-queries https://github.com/YevheniiKotyrlo/react-native-css
   cd react-native-css
   yarn install
   

2. Run yarn jest src/__tests__/native/attribute-query-in-is-where.test.tsx.

src/__tests__/native/attribute-query-in-is-where.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([
  [".test:where([data-test='abc'])", "abc", true],
  [".test:where([data-test='abc'])", "xyz", false],
  [".test:is([data-test='abc'], [data-other='xyz'])", "abc", true],
  [".test:is([data-test='abc'])", "abc", true],
])("%s on data-test=%s matches: %s", (selector, value, expected) => {
  registerCSS(`${selector} { width: 37px; }`);
  render(<View testID={testID} className="test" dataSet={{ test: value }} />);
  expect(screen.getByTestId(testID).props.style?.width === 37).toBe(expected);
});

Expected: .test:where([data-test="abc"]) and .test:is([data-test="abc"], [data-other="xyz"]) match dataSet={{ test: "abc" }}, as in a browser.

Actual: neither matches.

FAIL src/__tests__/native/attribute-query-in-is-where.test.tsx
  × .test:where([data-test='abc']) on data-test=abc matches: true (18 ms)
  √ .test:where([data-test='abc']) on data-test=xyz matches: false (4 ms)
  × .test:is([data-test='abc'], [data-other='xyz']) on data-test=abc matches: true (1 ms)
  √ .test:is([data-test='abc']) on data-test=abc matches: true (1 ms)
  ● .test:where([data-test='abc']) on data-test=abc matches: true
    expect(received).toBe(expected) // Object.is equality
    Expected: true
    Received: false
      11 |   registerCSS(`${selector} { width: 37px; }`);
      12 |   render(<View testID={testID} className="test" dataSet={{ test: value }} />);
    > 13 |   expect(screen.getByTestId(testID).props.style?.width === 37).toBe(expected);
         |                                                                ^
      14 | });
      15 |
      at toBe (src/__tests__/native/attribute-query-in-is-where.test.tsx:13:64)
  ● .test:is([data-test='abc'], [data-other='xyz']) on data-test=abc matches: true
    expect(received).toBe(expected) // Object.is equality
    Expected: true
    Received: false
      11 |   registerCSS(`${selector} { width: 37px; }`);
      12 |   render(<View testID={testID} className="test" dataSet={{ test: value }} />);
    > 13 |   expect(screen.getByTestId(testID).props.style?.width === 37).toBe(expected);
         |                                                                ^
      14 | });
      15 |
      at toBe (src/__tests__/native/attribute-query-in-is-where.test.tsx:13:64)
Test Suites: 1 failed, 1 total
Tests:       2 failed, 2 passed, 4 total
Snapshots:   0 total
Time:        1.049 s, estimated 2 s
Ran all test suites matching /src\\__tests__\\native\\attribute-query-in-is-where.test.tsx/i.

Reproducible example repository

https://github.com/YevheniiKotyrlo/react-native-css/tree/repro/541-is-where-attribute-queries