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[babel-plugin] Fix corrupted class names from null coercion in dynamic styles #1731

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[babel-plugin] Fix corrupted class names from null coercion in dynamic styles #1731

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b2b4686
[babel-plugin] Fix corrupted class names from null coercion in dynami…
henryqdineen Jun 22, 2026
a4889e8
[babel-plugin] Update remaining snapshots for null coercion fix
henryqdineen Jun 22, 2026
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2 changes: 1 addition & 1 deletion packages/@stylexjs/babel-plugin/__tests__/evaluation-import-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -402,7 +402,7 @@ describe('Evaluation of imported values works based on configuration', () => {
});
const styles = {
color: color => [{
"--__hashed_var__1jqb1tb": color != null ? "__hashed_var__1w8wjxo" : color,
"--__hashed_var__1jqb1tb": color != null ? "__hashed_var__1w8wjxo" : "",
$$css: true
}, {
"--x---__hashed_var__1jqb1tb": color != null ? color : undefined
Expand Down
6 changes: 3 additions & 3 deletions packages/@stylexjs/babel-plugin/__tests__/transform-process-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -240,7 +240,7 @@ describe('@stylexjs/babel-plugin', () => {
$$css: "components/main.js:71"
},
dynamic: color => [{
"color-kMwMTN": color != null ? "color-x14rh7hd" : color,
"color-kMwMTN": color != null ? "color-x14rh7hd" : "",
$$css: "components/main.js:74"
}, {
"--x-color": color != null ? color : undefined
Expand Down Expand Up @@ -333,7 +333,7 @@ describe('@stylexjs/babel-plugin', () => {
$$css: "main.js:71"
},
dynamic: color => [{
"color-kMwMTN": color != null ? "color-x14rh7hd" : color,
"color-kMwMTN": color != null ? "color-x14rh7hd" : "",
$$css: "main.js:74"
}, {
"--x-color": color != null ? color : undefined
Expand Down Expand Up @@ -781,7 +781,7 @@ describe('@stylexjs/babel-plugin', () => {
$$css: "main.js:71"
},
dynamic: color => [{
"color-kMwMTN": color != null ? "color-x14rh7hd" : color,
"color-kMwMTN": color != null ? "color-x14rh7hd" : "",
$$css: "main.js:74"
}, {
"--x-color": color != null ? color : undefined
Expand Down
46 changes: 23 additions & 23 deletions packages/@stylexjs/babel-plugin/__tests__/transform-stylex-create-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3645,7 +3645,7 @@ describe('@stylexjs/babel-plugin', () => {
};
export const styles = {
root: color => [_temp, {
kMwMTN: color != null ? "x14rh7hd" : color,
kMwMTN: color != null ? "x14rh7hd" : "",
$$css: true
}, {
"--x-color": color != null ? color : undefined
Expand Down Expand Up @@ -3700,7 +3700,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
one: color => [{
kMwMTN: color != null ? "x14rh7hd" : color,
kMwMTN: color != null ? "x14rh7hd" : "",
$$css: true
}, {
"--x-color": color != null ? color : undefined
Expand Down Expand Up @@ -3758,8 +3758,8 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (bgColor, otherColor) => [{
"--background-color": bgColor != null ? "xwn82o0" : bgColor,
"--otherColor": otherColor != null ? "xp3hsad" : otherColor,
"--background-color": bgColor != null ? "xwn82o0" : "",
"--otherColor": otherColor != null ? "xp3hsad" : "",
$$css: true
}, {
"--x---background-color": bgColor != null ? bgColor : undefined,
Expand Down Expand Up @@ -3822,7 +3822,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: width => [{
kzqmXN: width != null ? "x5lhr3w" : width,
kzqmXN: width != null ? "x5lhr3w" : "",
$$css: true
}, {
"--x-width": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(width)
Expand Down Expand Up @@ -3874,7 +3874,7 @@ describe('@stylexjs/babel-plugin', () => {
};
export const styles = {
root: width => [_temp, {
kzqmXN: width != null ? "x5lhr3w" : width,
kzqmXN: width != null ? "x5lhr3w" : "",
$$css: true
}, {
"--x-width": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(width),
Expand Down Expand Up @@ -3953,7 +3953,7 @@ describe('@stylexjs/babel-plugin', () => {
import { vars } from 'vars.stylex.js';
export const styles = {
root: width => [{
"--x1anmu0j": width != null ? "x5fq457" : width,
"--x1anmu0j": width != null ? "x5fq457" : "",
$$css: true
}, {
"--x---x1anmu0j": width != null ? width : undefined
Expand Down Expand Up @@ -4407,7 +4407,7 @@ describe('@stylexjs/babel-plugin', () => {
};
export const styles = {
root: (color, isDark) => [_temp, {
kMwMTN: (isDark ? color : 'black') != null ? "x14rh7hd" : isDark ? color : 'black',
kMwMTN: (isDark ? color : 'black') != null ? "x14rh7hd" : "",
$$css: true
}, {
"--x-backgroundColor": (isDark ? 'black' : 'white') != null ? isDark ? 'black' : 'white' : undefined,
Expand Down Expand Up @@ -4577,8 +4577,8 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: color => [{
kWkggS: color != null ? "x1j2k28p" : color,
kMwMTN: color != null ? "x1qvlgnj" : color,
kWkggS: color != null ? "x1j2k28p" : "",
kMwMTN: color != null ? "x1qvlgnj" : "",
$$css: true
}, {
"--x-1e2mv7m": color != null ? color : undefined,
Expand Down Expand Up @@ -4644,7 +4644,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (hover, active, focus) => [{
kMwMTN: (hover != null ? "x1qvlgnj " : hover) + (active != null ? "xx746rz " : active) + (focus != null ? "x152n5rj " : focus) + "x126ychx",
kMwMTN: (hover != null ? "x1qvlgnj " : "") + (active != null ? "xx746rz " : "") + (focus != null ? "x152n5rj " : "") + "x126ychx",
$$css: true
}, {
"--x-1113oo7": hover != null ? hover : undefined,
Expand Down Expand Up @@ -4737,8 +4737,8 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
foo: (a, b) => [{
kxBb7d: a != null ? "xaigonn" : a,
kB1Fuz: b != null ? "x1p1099i" : b,
kxBb7d: a != null ? "xaigonn" : "",
kB1Fuz: b != null ? "x1p1099i" : "",
$$css: true
}, {
"--x-1g451k2": a != null ? a : undefined,
Expand Down Expand Up @@ -4801,7 +4801,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
foo: color => [{
k8Qsv1: color != null ? "x1mzl164" : color,
k8Qsv1: color != null ? "x1mzl164" : "",
$$css: true
}, {
"--x-163tekb": color != null ? color : undefined
Expand Down Expand Up @@ -4847,7 +4847,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
foo: width => [{
k8pbKx: width != null ? "x18fgbt0" : width,
k8pbKx: width != null ? "x18fgbt0" : "",
$$css: true
}, {
"--x-msahdu": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(width)
Expand Down Expand Up @@ -4951,7 +4951,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
repro: color => [{
kB1Fuz: color != null ? "x1p1099i" : color,
kB1Fuz: color != null ? "x1p1099i" : "",
$$css: true
}, {
"--x-19erzii": color != null ? color : undefined
Expand Down Expand Up @@ -5001,7 +5001,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (a, b, c) => [{
kzqmXN: "x11ymkkh " + "x38mdg9 " + (c != null ? "x1bai16n" : c),
kzqmXN: "x11ymkkh " + "x38mdg9 " + (c != null ? "x1bai16n" : ""),
$$css: true
}, {
"--x-1xmrurk": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)('color-mix(' + color + ', blue)'),
Expand Down Expand Up @@ -5083,7 +5083,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (a, b, c) => [{
kMwMTN: (a != null ? "x3d248p " : a) + (b != null ? "x1iuwwch " : b) + (c != null ? "x5268pl" : c),
kMwMTN: (a != null ? "x3d248p " : "") + (b != null ? "x1iuwwch " : "") + (c != null ? "x5268pl" : ""),
$$css: true
}, {
"--x-4xs81a": a != null ? a : undefined,
Expand Down Expand Up @@ -5167,7 +5167,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (a, b, c) => [{
kGuDYH: (a != null ? "xww4jgc " : a) + (b != null ? "xfqys7t " : b) + (c != null ? "x13w7uki" : c),
kGuDYH: (a != null ? "xww4jgc " : "") + (b != null ? "xfqys7t " : "") + (c != null ? "x13w7uki" : ""),
$$css: true
}, {
"--x-19zvkyr": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(a),
Expand Down Expand Up @@ -5250,7 +5250,7 @@ describe('@stylexjs/babel-plugin', () => {
"import * as stylex from '@stylexjs/stylex';
export const styles = {
root: (a, b, c) => [{
kGuDYH: ((a ? '16px' : undefined) != null ? "xww4jgc " : a ? '16px' : undefined) + ((b ? '18px' : undefined) != null ? "xqdov8i " : b ? '18px' : undefined) + ((c ? '20px' : undefined) != null ? "x1j86d60" : c ? '20px' : undefined),
kGuDYH: ((a ? '16px' : undefined) != null ? "xww4jgc " : "") + ((b ? '18px' : undefined) != null ? "xqdov8i " : "") + ((c ? '20px' : undefined) != null ? "x1j86d60" : ""),
$$css: true
}, {
"--x-19zvkyr": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(a ? '16px' : undefined),
Expand Down Expand Up @@ -6042,9 +6042,9 @@ describe('@stylexjs/babel-plugin', () => {
});
export const styles = {
default: margin => [_temp, {
k71WvV: (margin != null ? "x17e2bsb " : margin) + "xtcj1g9",
k1K539: (margin != null ? "xg6eqc8 " : margin) + "xgrn1a3",
keTefX: (margin != null ? "x19ja4a5 " : margin) + "x2tye95",
k71WvV: (margin != null ? "x17e2bsb " : "") + "xtcj1g9",
k1K539: (margin != null ? "xg6eqc8 " : "") + "xgrn1a3",
keTefX: (margin != null ? "x19ja4a5 " : "") + "x2tye95",
$$css: true
}, {
"--x-14mfytm": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(margin),
Expand Down
4 changes: 2 additions & 2 deletions packages/@stylexjs/babel-plugin/__tests__/transform-stylex-defineConsts-test.js
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Expand Up @@ -543,7 +543,7 @@ describe('@stylexjs/babel-plugin', () => {
};
export const styles = {
node: padding => [_temp, {
kmVPX3: padding != null ? "x1fozly0" : padding,
kmVPX3: padding != null ? "x1fozly0" : "",
$$css: true
}, {
"--x-padding": (val => typeof val === "number" ? val + "px" : val != null ? val : undefined)(padding)
Expand Down Expand Up @@ -603,7 +603,7 @@ describe('@stylexjs/babel-plugin', () => {
import { breakpoints } from './constants.stylex';
export const styles = {
node: color => [{
kMwMTN: "xbs0o1n " + (color != null ? "x3d248p" : color),
kMwMTN: "xbs0o1n " + (color != null ? "x3d248p" : ""),
$$css: true
}, {
"--x-4xs81a": color != null ? color : undefined
Expand Down
8 changes: 4 additions & 4 deletions packages/@stylexjs/babel-plugin/__tests__/transform-stylex-props-test.js
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Expand Up @@ -544,7 +544,7 @@ describe('@stylexjs/babel-plugin', () => {
$$css: "npm-package:js/node_modules/npm-package/dist/components/Foo.react.js:4"
},
opacity: opacity => [{
"opacity-kSiTet": opacity != null ? "opacity-xb4nw82" : opacity,
"opacity-kSiTet": opacity != null ? "opacity-xb4nw82" : "",
$$css: "npm-package:js/node_modules/npm-package/dist/components/Foo.react.js:7"
}, {
"--x-opacity": opacity != null ? opacity : undefined
Expand Down Expand Up @@ -806,7 +806,7 @@ describe('@stylexjs/babel-plugin', () => {
});
const styles = {
color: c => [{
kMwMTN: c != null ? "x14rh7hd" : c,
kMwMTN: c != null ? "x14rh7hd" : "",
$$css: true
}, {
"--x-color": c != null ? c : undefined
Expand Down Expand Up @@ -902,7 +902,7 @@ describe('@stylexjs/babel-plugin', () => {
});
const styles = {
opacity: o => [{
kSiTet: o != null ? "xb4nw82" : o,
kSiTet: o != null ? "xb4nw82" : "",
$$css: true
}, {
"--x-opacity": o != null ? o : undefined
Expand Down Expand Up @@ -944,7 +944,7 @@ describe('@stylexjs/babel-plugin', () => {
});
const styles = {
opacity: o => [{
kSiTet: o != null ? "xb4nw82" : o,
kSiTet: o != null ? "xb4nw82" : "",
$$css: true
}, {
"--x-opacity": o != null ? o : undefined
Expand Down
2 changes: 1 addition & 1 deletion packages/@stylexjs/babel-plugin/src/visitors/stylex-create.js
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Expand Up @@ -421,7 +421,7 @@ export default function transformStyleXCreate(
t.conditionalExpression(
t.binaryExpression('!=', expr, t.nullLiteral()),
t.stringLiteral(clsWithSpace),
expr,
t.stringLiteral(''),
),
);
} else {
Expand Down
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