Fixes constants (#6432)

Author: arcanis

src/util/fs-normalized.js

@@ -5,6 +5,8 @@
 import fs from 'fs';
 import {promisify} from './promise.js';
 
+import {constants} from './fs';
+
 export type CopyFileAction = {
   src: string,
   dest: string,
@@ -37,7 +39,7 @@ export const unlink: (path: string) => Promise<void> = promisify(require('rimraf
  */
 export const copyFile = async function(data: CopyFileAction, cleanup: () => mixed): Promise<void> {
   // $FlowFixMe: Flow doesn't currently support COPYFILE_FICLONE
-  const ficloneFlag = fs.constants.COPYFILE_FICLONE || 0;
+  const ficloneFlag = constants.COPYFILE_FICLONE || 0;
   try {
     await unlink(data.dest);
     await copyFilePoly(data.src, data.dest, ficloneFlag, data);