fix(cli): convert the sourcemap option to boolean (fix #13638) (#13663)

Author: dd-jonas

packages/vite/src/node/cli.ts

@@ -87,6 +87,18 @@ function cleanOptions<Options extends GlobalCLIOptions>(
   delete ret.filter
   delete ret.m
   delete ret.mode
+
+  // convert the sourcemap option to a boolean if necessary
+  if ('sourcemap' in ret) {
+    const sourcemap = ret.sourcemap as `${boolean}` | 'inline' | 'hidden'
+    ret.sourcemap =
+      sourcemap === 'true'
+        ? true
+        : sourcemap === 'false'
+        ? false
+        : ret.sourcemap
+  }
+
   return ret
 }