Files
oxc-project__oxc/packages/codegen/test/jsx.test.ts
overlookmotel a4478e960a feat(codegen): add oxc-codegen package (#25488)
Add `oxc-codegen` package - a printer written in TS.

### Features

- Prints JS, JSX, TS, TSX.
- Matches `oxc_codegen` exactly on all Test262, TypeScript, Acorn-JSX fixtures.
- Very fast.

### Deficiencies

- Pretty-printing only (no compact/minified output).
- No support for printing comments.
- Source map support is semi-there, but largely untested, and poor API (design doc has some ideas on how to improve it).

### This PR adds

- The printer code.
- Conformance testing infra.
- Further tests for edge cases.
- README.
- Design doc - how it differs from `oxc_codegen` and why, what produces the perf.

### This PR doesn't add

- Not integrated into CI or release pipeline.

### Notes

This started as a slop port of `oxc_codegen`. I've iterated on that base, cleaned it up a lot, and at least skimmed through all of it. I think it's in fairly decent shape.

The design doc is I think worth a read. It explains the rationale for the choices, in particular the "1 codebase, 4 builds" approach.

I've put it in a new top-level directory called `packages`. It's not an app, so didn't seem to me to fit alongside `apps/oxlint` and `apps/oxfmt`. It's pure JS, so not like e.g. `napi/parser`. And it felt too heavyweight to put into `npm` dir. But maybe there's a better place for it.

Co-authored-by: Cameron <cameron.clark@hey.com>
2026-08-12 13:41:31 +00:00

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TypeScript

// Acorn-JSX conformance.
//
// Tests this package prints every JSX fixture exactly as Rust `oxc_codegen` prints it.
import { readdir, readFile } from "node:fs/promises";
import { join as pathJoin } from "node:path";
import { describe, it } from "vitest";
import { checkFixture, JSX_DIR_PATH } from "./utils/common.ts";
// The directory holds the recorded ASTs and tokens alongside the sources.
// Only the sources matter here - both printers work from a fresh parse.
const fixturePaths = (await readdir(JSX_DIR_PATH, { recursive: true }))
.filter((path) => path.endsWith(".jsx"))
.sort();
describe.concurrent("JSX", () => {
for (const path of fixturePaths) {
// oxlint-disable-next-line vitest/valid-title, vitest/expect-expect
it(path, async (ctx) => {
const sourceText = await readFile(pathJoin(JSX_DIR_PATH, path), "utf8");
if (!checkFixture(path, sourceText, "jsx", "unambiguous")) ctx.skip();
});
}
});