Prevent spaces between expressions from being removed (#35613)

fixes #35609

## Bug

- [x] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`


Co-authored-by: John Daly <1719443+JohnDaly@users.noreply.github.com>

packages/next-swc/crates/core/src/emotion/mod.rs

@@ -309,8 +309,13 @@ impl<C: Comments> EmotionTransformer<C> {
                     let q = q.take();
                     let minified =
                         minify_css_string(&q.raw.value, index == 0, index == args_len - 1);
-                    if !minified.replace(' ', "").is_empty() {
-                        args.push(minified.as_arg());
+                    // Compress one more spaces into one space
+                    if minified.replace(' ', "").is_empty() {
+                        if index != 0 && index != args_len - 1 {
+                            args.push(" ".as_arg());
+                        }
+                    } else {
+                        args.push(minified.as_arg())
                     }
                 }
             } else if let Some(e) = tagged_tpl.exprs.get_mut(i) {

packages/next-swc/crates/core/tests/fixture/emotion/compress/input.tsx

@@ -0,0 +1,15 @@
+import styled from '@emotion/styled'
+
+const unitNormal = '1rem'
+const unitLarge = '2rem'
+
+const Example = styled.div`
+  margin: ${unitNormal} ${unitLarge};
+`
+
+export const Animated = styled.div`
+  & code {
+    background-color: linen;
+  }
+  animation: ${({ animation }) => animation} 0.2s infinite ease-in-out alternate;
+`

packages/next-swc/crates/core/tests/fixture/emotion/compress/output.ts

@@ -0,0 +1,12 @@
+import styled from "@emotion/styled";
+const unitNormal = "1rem";
+const unitLarge = "2rem";
+const Example = /*#__PURE__*/ styled("div", {
+    target: "ekie5mj0",
+    label: "Example"
+})("margin:", unitNormal, " ", unitLarge, ";", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");
+export const Animated = /*#__PURE__*/ styled("div", {
+    target: "ekie5mj1",
+    label: "Animated"
+})("& code{background-color:linen;}animation:", ({ animation  })=>animation
+, " 0.2s infinite ease-in-out alternate;", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");

packages/next-swc/crates/core/tests/fixture/emotion/css-in-callback/output.ts

@@ -41,7 +41,7 @@ export const DivContainerExtended2 = /*#__PURE__*/ styled(DivContainer, {
 const Container = /*#__PURE__*/ styled("button", {
     target: "ekie5mj5",
     label: "Container"
-})("background:red;", stylesInCallback, ()=>/*#__PURE__*/ css({
+})("background:red;", stylesInCallback, " ", ()=>/*#__PURE__*/ css({
         background: "red"
     }, "label:Container", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5wdXQudHMiLCJzb3VyY2VzIjpbImlucHV0LnRzIl0sInNvdXJjZXNDb250ZW50IjpbImltcG9ydCB7IGNzcywgR2xvYmFsIH0gZnJvbSAnQGVtb3Rpb24vcmVhY3QnXG5pbXBvcnQgc3R5bGVkIGZyb20gJ0BlbW90aW9uL3N0eWxlZCdcbmltcG9ydCB7IFB1cmVDb21wb25lbnQgfSBmcm9tICdyZWFjdCdcbmltcG9ydCBSZWFjdERPTSBmcm9tICdyZWFjdC1kb20nXG5cbmNvbnN0IHN0eWxlc0luQ2FsbGJhY2sgPSAocHJvcHM6IGFueSkgPT5cbiAgY3NzKHtcbiAgICBjb2xvcjogJ3JlZCcsXG4gICAgYmFja2dyb3VuZDogJ3llbGxvdycsXG4gICAgd2lkdGg6IGAke3Byb3BzLnNjYWxlICogMTAwfXB4YCxcbiAgfSlcblxuY29uc3Qgc3R5bGVzID0gY3NzKHtcbiAgY29sb3I6ICdyZWQnLFxuICB3aWR0aDogJzIwcHgnLFxufSlcblxuY29uc3Qgc3R5bGVzMiA9IGNzc2BcbiAgY29sb3I6IHJlZDtcbiAgd2lkdGg6IDIwcHg7XG5gXG5cbmNvbnN0IERpdkNvbnRhaW5lciA9IHN0eWxlZC5kaXYoe1xuICBiYWNrZ3JvdW5kOiAncmVkJyxcbn0pXG5cbmNvbnN0IERpdkNvbnRhaW5lcjIgPSBzdHlsZWQuZGl2YFxuICBiYWNrZ3JvdW5kOiByZWQ7XG5gXG5cbmNvbnN0IFNwYW5Db250YWluZXIgPSBzdHlsZWQoJ3NwYW4nKSh7XG4gIGJhY2tncm91bmQ6ICd5ZWxsb3cnLFxufSlcblxuZXhwb3J0IGNvbnN0IERpdkNvbnRhaW5lckV4dGVuZGVkID0gc3R5bGVkKERpdkNvbnRhaW5lcilgYFxuZXhwb3J0IGNvbnN0IERpdkNvbnRhaW5lckV4dGVuZGVkMiA9IHN0eWxlZChEaXZDb250YWluZXIpKHt9KVxuXG5jb25zdCBDb250YWluZXIgPSBzdHlsZWQoJ2J1dHRvbicpYFxuICBiYWNrZ3JvdW5kOiByZWQ7XG4gICR7c3R5bGVzSW5DYWxsYmFja31cbiAgJHsoKSA9PlxuICAgIGNzcyh7XG4gICAgICBiYWNrZ3JvdW5kOiAncmVkJyxcbiAgICB9KX1cbiAgY29sb3I6IHllbGxvdztcbiAgZm9udC1zaXplOiAxMnB4O1xuYFxuXG5jb25zdCBDb250YWluZXIyID0gc3R5bGVkLmRpdmBcbiAgYmFja2dyb3VuZDogcmVkO1xuYFxuXG5leHBvcnQgY2xhc3MgU2ltcGxlQ29tcG9uZW50IGV4dGVuZHMgUHVyZUNvbXBvbmVudCB7XG4gIHJlbmRlcigpIHtcbiAgICByZXR1cm4gKFxuICAgICAgPENvbnRhaW5lclxuICAgICAgICBjc3M9e2Nzc2BcbiAgICAgICAgICBjb2xvcjogaG90cGluaztcbiAgICAgICAgYH1cbiAgICAgID5cbiAgICAgICAgPEdsb2JhbFxuICAgICAgICAgIHN0eWxlcz17Y3NzYFxuICAgICAgICAgICAgaHRtbCxcbiAgICAgICAgICAgIGJvZHkge1xuICAgICAgICAgICAgICBwYWRkaW5nOiAzcmVtIDFyZW07XG4gICAgICAgICAgICAgIG1hcmdpbjogMDtcbiAgICAgICAgICAgICAgYmFja2dyb3VuZDogcGFwYXlhd2hpcDtcbiAgICAgICAgICAgICAgbWluLWhlaWdodDogMTAwJTtcbiAgICAgICAgICAgICAgZm9udC1mYW1pbHk6IEhlbHZldGljYSwgQXJpYWwsIHNhbnMtc2VyaWY7XG4gICAgICAgICAgICAgIGZvbnQtc2l6ZTogMjRweDtcbiAgICAgICAgICAgIH1cbiAgICAgICAgICBgfVxuICAgICAgICAvPlxuICAgICAgICA8c3Bhbj5oZWxsbzwvc3Bhbj5cbiAgICAgIDwvQ29udGFpbmVyPlxuICAgIClcbiAgfVxufVxuXG5SZWFjdERPTS5yZW5kZXIoPFNpbXBsZUNvbXBvbmVudCAvPiwgZG9jdW1lbnQucXVlcnlTZWxlY3RvcignI2FwcCcpKVxuIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiJBQXlDSSJ9 */")
 , "  color:yellow;font-size:12px;", "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */");