ERR_UNSUPPORTED_DIR_IMPORT

[ziimakc]

Describe the bug

SWC version 1.79+ omits /index.js in imports when compiled, which results in runtime error for this imports:

Error [ERR_UNSUPPORTED_DIR_IMPORT]: Directory import 'redacted/modules/ping/gql' is not supported resolving ES modules imported from 'redacted'

Probably this MR is the cause.
Directory imports are not allowed:

Mandatory file extensions
A file extension must be provided when using the import keyword to resolve relative or absolute specifiers. Directory indexes >(e.g. './startup/index.js') must also be fully specified.
This behavior matches how import behaves in browser environments, assuming a typically configured server.

Input code

typescript:

import { pingIndex } from "../modules/ping/gql/index.js";

compiled (swc 1.79):

import { pingIndex } from "../modules/ping/gql"; # this is not correct

compiled (swc 1.78):

import { pingIndex } from "../modules/ping/gql/index.js"; # works as expected

### Config

```json
{
	"$schema": "https://json.schemastore.org/swcrc",
	"module": {
		"type": "es6",
		"strictMode": true,
		"noInterop": false
	},
	"jsc": {
		"parser": {
			"syntax": "typescript",
			"dynamicImport": true
		},
		"transform": { "legacyDecorator": true, "decoratorMetadata": false },
		"target": "es2022",
		"externalHelpers": true,
		"keepClassNames": true,
		"paths": {
			"@app/*": ["./src/*"]
		},
		"baseUrl": "."
	},
	"sourceMaps": true
}

Playground link

Can't reproduce in playground.

Reprodution repo

SWC Info output

Some resent npx issue doesn't allow to run this, error:

Cannot read properties of undefined (reading 'isStream')

Expected behavior

Compiled code should include index.js as it was defined.

import { pingIndex } from "../modules/ping/gql/index.js";

Actual behavior

Compiled code omits index.js.

import { pingIndex } from "../modules/ping/gql";

Version

1.79+

Additional context

No response

[kdy1]

Reopening as fix was reverted. #7906

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.