feat(dev): add this.fs support (#20301)

Author: sapphi-red

package.json

@@ -65,7 +65,7 @@
     "picocolors": "^1.1.1",
     "playwright-chromium": "^1.54.1",
     "prettier": "3.6.2",
-    "rollup": "^4.40.0",
+    "rollup": "^4.43.0",
     "simple-git-hooks": "^2.13.0",
     "tsx": "^4.20.3",
     "typescript": "~5.7.2",

packages/vite/package.json

@@ -85,7 +85,7 @@
     "fdir": "^6.4.6",
     "picomatch": "^4.0.3",
     "postcss": "^8.5.6",
-    "rollup": "^4.40.0",
+    "rollup": "^4.43.0",
     "tinyglobby": "^0.2.14"
   },
   "optionalDependencies": {

packages/vite/src/node/__tests__/plugins/hooks.spec.ts

@@ -330,4 +330,18 @@ describe('supports plugin context', () => {
       },
     })
   })
+
+  test('this.fs is supported in dev', async () => {
+    expect.hasAssertions()
+
+    const server = await createServerWithPlugin({
+      name: 'test',
+      resolveId(id) {
+        if (id !== ENTRY_ID) return
+        expect(this.fs.readFile).toBeTypeOf('function')
+      },
+    })
+    await server.transformRequest(ENTRY_ID)
+    await server.close()
+  })
 })

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

@@ -30,6 +30,7 @@ SOFTWARE.
 */
 
 import fs from 'node:fs'
+import fsp from 'node:fs/promises'
 import { join } from 'node:path'
 import { performance } from 'node:perf_hooks'
 import { parseAst as rollupParseAst } from 'rollup/parseAst'
@@ -50,6 +51,7 @@ import type {
   PluginContextMeta,
   ResolvedId,
   RollupError,
+  RollupFsModule,
   RollupLog,
   MinimalPluginContext as RollupMinimalPluginContext,
   PluginContext as RollupPluginContext,
@@ -617,6 +619,22 @@ class MinimalPluginContext<T extends Environment = Environment>
   }
 }
 
+const fsModule: RollupFsModule = {
+  appendFile: fsp.appendFile,
+  copyFile: fsp.copyFile,
+  mkdir: fsp.mkdir as RollupFsModule['mkdir'],
+  mkdtemp: fsp.mkdtemp,
+  readdir: fsp.readdir,
+  readFile: fsp.readFile as RollupFsModule['readFile'],
+  realpath: fsp.realpath,
+  rename: fsp.rename,
+  rmdir: fsp.rmdir,
+  stat: fsp.stat,
+  lstat: fsp.lstat,
+  unlink: fsp.unlink,
+  writeFile: fsp.writeFile,
+}
+
 class PluginContext
   extends MinimalPluginContext
   implements Omit<RollupPluginContext, 'cache'>
@@ -635,6 +653,8 @@ class PluginContext
     super(_container.minimalContext.meta, _container.environment)
   }
 
+  fs = fsModule
+
   parse(code: string, opts: any) {
     return rollupParseAst(code, opts)
   }