closes https://github.com/oxc-project/oxc-vscode/issues/140
Preferring the languageID over the real file extension creates inconsistency between the editor and the CLI.
Reverting the changes from #19977 back to align back with CLI.
This only effects `file://` scheme, where we can expect a real file on a disk. Other schemes are still preferring the languageID, because we do not to what exactly they are relating to.
NOTE: I'll do a self-review and add the test tomorrow.
<details>
<summary>Prompt</summary>
```
# Support `vite.config.*` as a Configuration File
## Target Files
- `vite.config.ts`
- `vite.config.mts`
- `vite.config.cts`
- `vite.config.js`
- `vite.config.mjs`
- `vite.config.cjs`
## Auto-Discovery Priority
When searching for a config file from `cwd` upwards, the following priority applies within the same directory:
1. Tool-specific JSON/JSONC config files (e.g. `.oxfmtrc.json`, `.oxlintrc.json`)
2. Tool-specific JS/TS config files (e.g. `oxfmt.config.ts`, `oxlint.config.ts`)
3. `vite.config.*`
## Extracting Configuration
The default export of `vite.config.*` is expected to contain tool-specific configuration under a dedicated field:
- oxfmt: `.fmt`
- oxlint: `.lint`
If the field does not exist, an error is returned (e.g. `Expected a 'fmt' field in the default export.`).
## Explicit `--config` Flag
When `--config vite.config.ts` is explicitly specified, the same behavior applies. The file name is used to determine whether to extract a nested field.
## LSP
`vite.config.*` files are added to the file watch patterns so that configuration changes trigger a reload.
```
</details>
- [x] Explore the codebase (apps/oxfmt/src/lsp/, test/lsp/format/)
- [x] Make `get_file_extension_from_language_id` accessible (pub(super)) in `mod.rs`
- [x] Modify `format_file` in `server_formatter.rs` to prefer `language_id` over file extension
- [x] Update `run_format` to pass `language_id` to `format_file`
- [x] Create test fixture `apps/oxfmt/test/lsp/format/fixtures/format/test.ts.txt`
- [x] Add test case in `format.test.ts` for `.txt` file with TypeScript `language_id`
- [x] Update snapshot
- [x] Refactor: extract `apply_language_id_extension` helper shared by both `create_fake_file_path_from_language_id` and `format_file`
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leaysgur