Config should be parsed with a target what supports import.meta

[sionzee]

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Describe the bug

You are not able to declare __dirname in ESM mode because import.meta is not available in the vite.config.ts.
I'm using the __dirname to find packages in monorepo.

Reproduction

1. Set your package's target to module.
2. Create vite.config.ts and put there:

import {dirname} from "path";
import {fileURLToPath} from "url";

const metaUrl = import.meta.url;
console.log("meta-url", metaUrl);
const __dirname = dirname(fileURLToPath(metaUrl));

export default {};

3. Run vite
   You will get undefined for metaUrl and an error for fileURLtoPath cuz it expects a string.

System Info

• vite version: this is happening since beta 22
• Operating System: Windows 10 but using WSL
• Node version: 14.13.0
• Package manager (npm/yarn/pnpm) and version: yarn 1.22.5

Logs (Optional if provided reproduction)

$ DEBUG=* yarn vite
yarn run v1.22.5
$ <workspace>/node_modules/.bin/vite
"import.meta" is not available in the configured target environment and will be empty
2  |  import {fileURLToPath} from "url";
3  |
4  |  const metaUrl = import.meta.url;
|                  ^
5  |  console.log("meta-url", metaUrl);
6  |  const __dirname = dirname(fileURLToPath(metaUrl));

meta-url undefined
failed to load config from <workspace>/vite.config.ts
error when starting dev server:
  TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string or an instance of URL. Received undefined
at fileURLToPath (internal/url.js:1348:11)
at data:text/javascript,import { dirname } from 'path';
import { fileURLToPath } from 'url';

const import_meta = {};
const metaUrl = import_meta.url;
console.log("meta-url", metaUrl);
const __dirname = dirname(fileURLToPath(metaUrl));
var vite_config = {};

export default vite_config;
:1:182
at ModuleJob.run (internal/modules/esm/module_job.js:146:23)
at processTicksAndRejections (internal/process/task_queues.js:93:5)
at async Loader.import (internal/modules/esm/loader.js:165:24)
at async loadConfigFromFile (<workspace>/node_modules/vite/dist/node/chunks/dep-478c65b9.js:46855:31)
at async resolveConfig (<workspace>/node_modules/vite/dist/node/chunks/dep-478c65b9.js:46650:28)
at async createServer$2 (<workspace>/node_modules/vite/dist/node/chunks/dep-478c65b9.js:65202:20)
at async CAC.<anonymous> (<workspace>/node_modules/vite/dist/node/cli.js:681:24)
  error Command failed with exit code 1.
  info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.