fix: normalize config.root

[bufan-huang]

Invalid sorting of type file generation, resulting in unnecessary git versions
Reading DTS file is empty while writing the file is incomplete

vite

Debugger attached.
环境变量 VITE_DROP_CONSOLE undefined
configResolved 《======= 【Trigger Event 1】
scanDirs writeConfigFilesThrottled
writeConfigFiles
readFile Ing 1700340039378 《======= 【Trigger Event 1 readFile Ing】
originalContent：/* eslint-disable /
/ prettier-ignore /
// @ts-nocheck
// noinspection JSUnusedGlobalSymbols
// Generated by unplugin-auto-import
export {}
declare global {
const $: typeof import('vue/macros')['$']
const $$: typeof import('vue/macros')['$$']
const $computed: typeof import('vue/macros')['$c 1700340039385
content !== lastDTS writeFile true
buildStart 《======= 【Trigger Event 2】
scanDirs writeConfigFilesThrottled
writeConfigFiles
readFile Ing 1700340039970 《======= 【Trigger Event 2 readFile Ing】
writeFile ing : 《======= 【Trigger Event 1 writeFile Ing】
E:\hby\project**\packages\vite-vue3-admin-main\auto-imports.d.ts
/ eslint-disable /
/ prettier-ignore */
// @ts-nocheck
// noinspection JSUnusedGlobalSymbols
// Generated by unplugin-auto-import
export {}
declare global {
const $: typeof import('vue/macros')['$']
const $$: typeof import('vue/macros')['$$']
const $computed: typeof import('vue/macros')['$c 1700340039988

VITE v4.5.0 ready in 7238 ms

➜ Local: http://localhost:8088/
➜ Network: http://198.18.0.1:8088/
➜ Network: http://192.168.110.110:8088/
➜ press h to show help
originalContent： 1700340040095 《======= 【Trigger Event 2 readFile End content empty】
content !== lastDTS writeFile false
writeFile end : 1700340040098 《======= 【Trigger Event 1 writeFile End】
writeFile ing :
E:\hby\project**\packages\vite-vue3-admin-main\auto-imports.d.ts
/* eslint-disable /
/ prettier-ignore */
// @ts-nocheck
// noinspection JSUnusedGlobalSymbols
// Generated by unplugin-auto-import
export {}
declare global {
const $$: typeof import('vue/macros')['$$']
const $: typeof import('vue/macros')['$']
const $computed: typeof import('vue/macros')['$c 1700340040104
writeFile end : 1700340040115

It was found that the configResolved event triggered writing to the file while the buildStart event triggered it

Vite related pr
vitejs/vite#1693

Can also read file locks

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[antfu]

I think we could always slash without checking with os