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fix(emotion): merge target/label into non-object-literal styled() options #648

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fix(emotion): merge target/label into non-object-literal styled() options #648

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12 changes: 12 additions & 0 deletions .changeset/olive-donkeys-shave.md
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---
"@swc/plugin-emotion": patch
---

Merge generated `target`/`label` options into non-object-literal `styled` options instead of appending a third argument.

`styled('div', someIdentifier)` and `styled('div', config.opts)` previously emitted
`styled('div', someIdentifier, { target, label })`. `@emotion/styled` only reads two
arguments, so the generated `target` was silently dropped and `${Component}` selectors
against those components broke at runtime with no build-time signal. These now spread the
original expression into the options object, matching the existing handling of call
expressions such as `styled('div', makeOptions())`.
22 changes: 2 additions & 20 deletions packages/emotion/transform/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -643,7 +643,7 @@ impl<C: Comments> Fold for EmotionTransformer<'_, C> {
Expr::Object(ObjectLit { props, .. }) => {
props.extend(args_props);
}
Expr::Call(_) => {
_ => {

@chatgpt-codex-connector chatgpt-codex-connector Bot Jul 31, 2026

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P2 Badge Preserve spread arguments when wrapping styled options

When the second argument is itself spread, such as styled("div", ...args)(styles), this arm replaces only its expression while retaining ExprOrSpread.spread. The emitted call becomes styled("div", ...{ target, label, ...args }), and attempting to spread that non-iterable object into the call throws at runtime. Check and handle the argument's spread marker before applying this wrapper; the mirrored tagged-template path has the same issue.

Useful? React with 👍 / 👎.

args_props.push(PropOrSpread::Spread(
SpreadElement {
dot3_token: DUMMY_SP,
Expand All @@ -656,15 +656,6 @@ impl<C: Comments> Fold for EmotionTransformer<'_, C> {
props: args_props,
}));
}
_ => {
c.args.push(
Expr::Object(ObjectLit {
span: DUMMY_SP,
props: args_props,
})
.as_arg(),
);
}
}
} else {
c.args.push(
Expand Down Expand Up @@ -819,7 +810,7 @@ impl<C: Comments> Fold for EmotionTransformer<'_, C> {
Expr::Object(ObjectLit { props, .. }) => {
props.extend(object_props);
}
Expr::Call(_) => {
_ => {
object_props.push(PropOrSpread::Spread(
SpreadElement {
dot3_token: DUMMY_SP,
Expand All @@ -832,15 +823,6 @@ impl<C: Comments> Fold for EmotionTransformer<'_, C> {
props: object_props,
}));
}
_ => {
callee.args.push(
Expr::Object(ObjectLit {
span: DUMMY_SP,
props: object_props,
})
.as_arg(),
);
}
}
} else {
callee.args.push(
Expand Down
9 changes: 9 additions & 0 deletions packages/emotion/transform/tests/fixture/styled-non-literal-options/input.tsx
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import styled from "@emotion/styled";

const opts = { shouldForwardProp: (p: string) => !p.startsWith("$") };
const config = { opts };

const IdentTpl = styled("div", opts)`color: red;`;
const IdentCall = styled("div", opts)({ color: "red" });
const MemberTpl = styled("div", config.opts)`color: red;`;
const MemberCall = styled("div", config.opts)({ color: "red" });
31 changes: 31 additions & 0 deletions packages/emotion/transform/tests/fixture/styled-non-literal-options/output.ts
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import styled from "@emotion/styled";
const opts = {
shouldForwardProp: (p: string)=>!p.startsWith("$")
};
const config = {
opts
};
const IdentTpl = /*#__PURE__*/ styled("div", {
target: "e18y1z280",
label: "IdentTpl",
...opts
})("color:red;", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5wdXQudHMiLCJzb3VyY2VzIjpbImlucHV0LnRzIl0sInNvdXJjZXNDb250ZW50IjpbImltcG9ydCBzdHlsZWQgZnJvbSBcIkBlbW90aW9uL3N0eWxlZFwiO1xuXG5jb25zdCBvcHRzID0geyBzaG91bGRGb3J3YXJkUHJvcDogKHA6IHN0cmluZykgPT4gIXAuc3RhcnRzV2l0aChcIiRcIikgfTtcbmNvbnN0IGNvbmZpZyA9IHsgb3B0cyB9O1xuXG5jb25zdCBJZGVudFRwbCA9IHN0eWxlZChcImRpdlwiLCBvcHRzKWBjb2xvcjogcmVkO2A7XG5jb25zdCBJZGVudENhbGwgPSBzdHlsZWQoXCJkaXZcIiwgb3B0cykoeyBjb2xvcjogXCJyZWRcIiB9KTtcbmNvbnN0IE1lbWJlclRwbCA9IHN0eWxlZChcImRpdlwiLCBjb25maWcub3B0cylgY29sb3I6IHJlZDtgO1xuY29uc3QgTWVtYmVyQ2FsbCA9IHN0eWxlZChcImRpdlwiLCBjb25maWcub3B0cykoeyBjb2xvcjogXCJyZWRcIiB9KTtcbiJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiQUFLaUIifQ== */");
const IdentCall = /*#__PURE__*/ styled("div", {
target: "e18y1z281",
label: "IdentCall",
...opts
})({
color: "red"
}, "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");
const MemberTpl = /*#__PURE__*/ styled("div", {
target: "e18y1z282",
label: "MemberTpl",
...config.opts
})("color:red;", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");
const MemberCall = /*#__PURE__*/ styled("div", {
target: "e18y1z283",
label: "MemberCall",
...config.opts
})({
color: "red"
}, "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");
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