fix: use relative path for sources field (#14247)

Author: sapphi-red

packages/vite/src/node/server/send.ts

@@ -3,6 +3,7 @@ import type {
   OutgoingHttpHeaders,
   ServerResponse,
 } from 'node:http'
+import path from 'node:path'
 import getEtag from 'etag'
 import type { SourceMap } from 'rollup'
 import MagicString from 'magic-string'
@@ -69,7 +70,11 @@ export function send(
       content = getCodeWithSourcemap(
         type,
         content.toString(),
-        ms.generateMap({ source: urlWithoutTimestamp, hires: 'boundary' }),
+        ms.generateMap({
+          source: path.basename(urlWithoutTimestamp),
+          hires: 'boundary',
+          includeContent: true,
+        }),
       )
     }
   }

playground/js-sourcemap/__tests__/js-sourcemap.spec.ts

@@ -18,7 +18,11 @@ if (!isBuild) {
       {
         "mappings": "AAAA,MAAM,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC,CAAC,CAAC,GAAG,CAAC;",
         "sources": [
-          "/foo.js",
+          "foo.js",
+        ],
+        "sourcesContent": [
+          "export const foo = 'foo'
+      ",
         ],
         "version": 3,
       }