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oxc-project__oxc/crates/oxc_react_compiler/tests/snapshots/repro-memoize-array-with-immutable-map-after-hook.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/repro-memoize-array-with-immutable-map-after-hook.js
---
import { c as _c } from "react/compiler-runtime";
import { useEffect, useState } from "react";
function Component(props) {
const $ = _c(10);
let t0;
if ($[0] !== props.value) {
t0 = [props.value];
$[0] = props.value;
$[1] = t0;
} else {
t0 = $[1];
}
const x = t0;
let t1;
if ($[2] === Symbol.for("react.memo_cache_sentinel")) {
t1 = [];
$[2] = t1;
} else {
t1 = $[2];
}
useEffect(_temp, t1);
let t2;
if ($[3] !== x.length) {
t2 = () => {
console.log(x.length);
};
$[3] = x.length;
$[4] = t2;
} else {
t2 = $[4];
}
const onClick = t2;
let t3;
if ($[5] !== x) {
t3 = x.map(_temp2);
$[5] = x;
$[6] = t3;
} else {
t3 = $[6];
}
let t4;
if ($[7] !== onClick || $[8] !== t3) {
t4 = <div onClick={onClick}>{t3}</div>;
$[7] = onClick;
$[8] = t3;
$[9] = t4;
} else {
t4 = $[9];
}
return t4;
}
function _temp2(item) {
return <span key={item}>{item}</span>;
}
function _temp() {}
export const FIXTURE_ENTRYPOINT = {
fn: Component,
params: [{ value: 42 }],
isComponent: true
};