ESM .postcssrc.ts w. "type": "module" results in ERR_REQUIRE_ESM #15869
Description
Originally reported over here by @ElPrudi (before the issue was fixed in postcss-load-config):
Describe the bug
Upgrading to a version after [email protected] (which added support for ESM postcss.config.ts w. "type": "module" does not resolve the problem in Vite that require() is used to load an ESM postcss.config.ts (or any other variations on the TS config) when in a "type": "module" project:
> vite
[Failed to load PostCSS config: Failed to load PostCSS config (searchPath: /home/projects/vitejs-vite-2gepfr): [Error] Must use import to load ES Module: /home/projects/vitejs-vite-2gepfr/.postcssrc.ts
require() of ES modules is not supported.
require() of /home/projects/vitejs-vite-2gepfr/.postcssrc.ts from /home/projects/vitejs-vite-2gepfr/node_modules/vite/dist/node/chunks/dep-bb8a8339.js is an ES module file as it is a .ts file whose nearest parent package.json contains "type": "module" which defines all .ts files in that package scope as ES modules.
Instead change the requiring code to use import(), or remove "type": "module" from /home/projects/vitejs-vite-2gepfr/package.json.
Error: Must use import to load ES Module: /home/projects/vitejs-vite-2gepfr/.postcssrc.ts
require() of ES modules is not supported.
require() of /home/projects/vitejs-vite-2gepfr/.postcssrc.ts from /home/projects/vitejs-vite-2gepfr/node_modules/vite/dist/node/chunks/dep-bb8a8339.js is an ES module file as it is a .ts file whose nearest parent package.json contains "type": "module" which defines all .ts files in that package scope as ES modules.
Instead change the requiring code to use import(), or remove "type": "module" from /home/projects/vitejs-vite-2gepfr/package.json.
at createErrRequireEsm (/home/projects/vitejs-vite-2gepfr/node_modules/ts-node/dist-raw/node-internal-errors.js:46:15)
at assertScriptCanLoadAsCJSImpl (/home/projects/vitejs-vite-2gepfr/node_modules/ts-node/dist-raw/node-internal-modules-cjs-loader.js:584:11)
at Object.require.extensions.<computed> [as .ts] (/home/projects/vitejs-vite-2gepfr/node_modules/ts-node/src/index.ts:1610:5)
at Module.load (node:internal/modules/cjs/loader:54:13457)
at Function.Module._load (node:internal/modules/cjs/loader:54:10535)
at Module.require (node:internal/modules/cjs/loader:54:13775)
at i (node:internal/modules/cjs/helpers:98:2198)
at eval (/home/projects/vitejs-vite-2gepfr/node_modules/vite/dist/node/chunks/dep-bb8a8339.js:36654:16)
at Object.search (/home/projects/vitejs-vite-2gepfr/node_modules/vite/dist/node/chunks/dep-bb8a8339.js:29044:44)] {
code: 'ERR_REQUIRE_ESM'
}cc @bluwy
Reproduction
Steps to reproduce
Create a config file called postcss.config.ts (or .postcssrc.ts, as in the reproduction above):
import type { Config } from 'postcss-load-config'
import cssnano from 'cssnano'
export default ({ env }): Config => ({
plugins: [
cssnano({
preset: 'default'
})
]
})System Info
System:
OS: Linux 5.0 undefined
CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Memory: 0 Bytes / 0 Bytes
Shell: 1.0 - /bin/jsh
Binaries:
Node: 18.18.0 - /usr/local/bin/node
Yarn: 1.22.19 - /usr/local/bin/yarn
npm: 10.2.3 - /usr/local/bin/npm
pnpm: 8.14.0 - /usr/local/bin/pnpmUsed Package Manager
npm
Logs
See logs above
Validations
- Follow our Code of Conduct
- Read the Contributing Guidelines.
- Read the docs.
- Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
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- The provided reproduction is a minimal reproducible example of the bug.