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oxc-project__oxc/crates/oxc_react_compiler/tests/snapshots/merge-consecutive-scopes-objects.snap
Boshen 6efce65746 test(react_compiler): snapshot the upstream fixture corpus (#24101)
## Summary

`oxc_react_compiler` had no committed test over the upstream React
Compiler fixture corpus — the fixtures lived only in the
`oxc-project/forked-react-compiler` checkout, exercised out-of-tree.
That gap let real regressions slip past the 15 in-crate integration
tests. This PR closes it.

- **`crates/oxc_react_compiler/fixtures/`** — 1734 fixture *input* files
(`.js`/`.ts`/`.tsx`/`.jsx`/`.mjs`), copied from the fork's
`babel-plugin-react-compiler/src/__tests__/fixtures/compiler` tree with
subdirectories preserved. Flow fixtures (the `@flow`-pragma ones) are
excluded — oxc has no Flow parser. The upstream `.expect.md` goldens are
also not copied; insta is the golden here.
- **`crates/oxc_react_compiler/tests/snapshot.rs`** — an `insta::glob!`
test that, per fixture, derives `PluginOptions`/`EnvironmentConfig` from
the first-line `// @directive` pragmas (base `compilationMode=all` /
`panicThreshold=all_errors`, matching the upstream `snap` runner),
parses → builds semantic → runs `transform`, and snapshots the compiled
output plus diagnostics. Unrecognised directives are ignored, as
upstream does; camelCase flag directives map to `EnvironmentConfig`
fields via `convert_case`.
- **`crates/oxc_react_compiler/tests/snapshots/`** — 1734 committed
`.snap` goldens (oxc's own output).
- **`.typos.toml`** — excludes the fixtures dir (the upstream fixtures
contain intentional typos; `**/*.snap` was already excluded).

These snapshots are oxc's own golden output, so `cargo test` (and CI)
now catches any change in compiler behaviour across the corpus.
Regenerate after an intended change with `cargo insta accept`.

## Verification

- `cargo test -p oxc_react_compiler` passes — the 1734-fixture snapshot
test plus the existing 15 integration tests; also green under
`--all-features` (matches the cross-target CI job).
- clippy `-D warnings`, `cargo fmt`, and `typos` clean.
- No fixture panics; 1336 compiled / 398 unchanged / 335 with
diagnostics.
- The `error.*` fixtures capture the exact diagnostics — including the
"Cannot reassign variable after render" error that a recent scoping
change had silently suppressed, confirming the suite catches real
regressions.

---

AI usage disclosure: authored with Claude Code and reviewed before
submission.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
2026-07-03 16:49:53 +08:00

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---
source: crates/oxc_react_compiler/tests/snapshot.rs
input_file: crates/oxc_react_compiler/fixtures/merge-consecutive-scopes-objects.js
---
import { c as _c } from "react/compiler-runtime";
import { useState } from "react";
import { Stringify } from "shared-runtime";
// This is a translation of the original merge-consecutive-scopes which uses plain objects
// to describe the UI instead of JSX. The JSXText elements in that fixture happen to
// prevent scome scopes from merging, which concealed a bug with the merging logic.
// By avoiding JSX we eliminate extraneous instructions and more accurately test the merging.
function Component(props) {
const $ = _c(11);
const [state, setState] = useState(0);
let t0;
if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
t0 = {
component: Stringify,
props: { text: "Counter" }
};
$[0] = t0;
} else {
t0 = $[0];
}
let t1;
if ($[1] !== state) {
t1 = {
component: "span",
props: { children: [state] }
};
$[1] = state;
$[2] = t1;
} else {
t1 = $[2];
}
let t2;
if ($[3] !== state) {
t2 = () => setState(state + 1);
$[3] = state;
$[4] = t2;
} else {
t2 = $[4];
}
let t3;
if ($[5] === Symbol.for("react.memo_cache_sentinel")) {
t3 = ["increment"];
$[5] = t3;
} else {
t3 = $[5];
}
let t4;
if ($[6] !== t2) {
t4 = {
component: "button",
props: {
"data-testid": "button",
onClick: t2,
children: t3
}
};
$[6] = t2;
$[7] = t4;
} else {
t4 = $[7];
}
let t5;
if ($[8] !== t1 || $[9] !== t4) {
t5 = [
t0,
t1,
t4
];
$[8] = t1;
$[9] = t4;
$[10] = t5;
} else {
t5 = $[10];
}
return t5;
}
export const FIXTURE_ENTRYPOINT = {
fn: Component,
params: [{}]
};