Bail out of whitespace removal inside nested concat expressions

Author: thecrypticace

src/index.ts

@@ -630,10 +630,8 @@ function transformJavaScript(ast: import('@babel/types').Node, { env }: Transfor
         // Nodes inside concat expressions shouldn't collapse whitespace
         // depending on which side they're part of.
         if (entry.parent.type === 'BinaryExpression' && entry.parent.operator === '+') {
-          start = entry.key !== 'right'
-          end = entry.key !== 'left'
-
-          break
+          start &&= entry.key !== 'right'
+          end &&= entry.key !== 'left'
         }
       }
 

tests/format.test.ts

@@ -58,6 +58,14 @@ describe('whitespace', () => {
     expect(result).toEqual(';<div className={`text-red-500 underline ${foo}-bar flex`}></div>')
   })
 
+  test('whitespace is not trimmed inside concat expressions', async ({ expect }) => {
+    let result = await format(";<div className={a + ' p-4 ' + b}></div>", {
+      parser: 'babel',
+    })
+
+    expect(result).toEqual(";<div className={a + ' p-4 ' + b}></div>")
+  })
+
   test('duplicate classes are dropped', async ({ expect }) => {
     let result = await format('<div class="underline line-through underline flex"></div>')