Fix whitespace removal caused by re-parsing at-rules (#400)

* Tweak test example

* Add failing test

* Pass in shallow copy of parse options when re-parsing at-rule params

* Update test case

Author: thecrypticace

src/index.ts

@@ -735,7 +735,12 @@ function transformCss(ast: any, { env }: TransformerContext) {
     // based on postcss-value parser.
     try {
       let parser = base.parsers.css
-      let root = parser.parse(`@import ${params};`, env.options)
+
+      let root = parser.parse(`@import ${params};`, {
+        // We can't pass env.options directly because css.parse overwrites
+        // options.originalText which is used during the printing phase
+        ...env.options,
+      })
 
       return root.nodes[0].params
     } catch (err) {

tests/tests.ts

@@ -46,7 +46,20 @@ let css: TestEntry[] = [
   [`@config "./file.js";`, `@config './file.js';`],
   [`@source "./file.js";`, `@source './file.js';`],
   [`@source not "./file.js";`, `@source not './file.js';`],
-  [`@source inline("./file.js");`, `@source inline('./file.js');`],
+  [`@source inline("flex");`, `@source inline('flex');`],
+
+  [
+    `@import "tailwindcss";\n\n@import "./theme.css";\n\n@source "./file.js";\n\n.foo {\n  color: red;\n}`,
+    `@import 'tailwindcss';\n\n@import './theme.css';\n\n@source './file.js';\n\n.foo {\n  color: red;\n}`,
+  ],
+  [
+    `@import "tailwindcss";\n\n@import "./theme.css";\n\n@plugin "./file.js";\n\n.foo {\n  color: red;\n}`,
+    `@import 'tailwindcss';\n\n@import './theme.css';\n\n@plugin './file.js';\n\n.foo {\n  color: red;\n}`,
+  ],
+  [
+    `@import "tailwindcss";\n\n@import "./theme.css";\n\n@config "./file.js";\n\n.foo {\n  color: red;\n}`,
+    `@import 'tailwindcss';\n\n@import './theme.css';\n\n@config './file.js';\n\n.foo {\n  color: red;\n}`,
+  ],
 ]
 
 export let javascript: TestEntry[] = [