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Original file line number Diff line number Diff line change
Expand Up @@ -954,6 +954,7 @@ function applyEffect(
case ValueKind.Primitive: {
break;
}
case ValueKind.MaybeFrozen:
case ValueKind.Frozen: {
sourceType = 'frozen';
break;
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@

## Input

```javascript
export function useFormatRelativeTime(opts = {}) {
const {timeZone, minimal} = opts;
const format = useCallback(function formatWithUnit() {}, [minimal]);
// We previously recorded `{timeZone}` as capturing timeZone into the object,
// then assumed that dateTimeFormat() mutates that object,
// which in turn could mutate timeZone and the object it came from,
// which meanteans that the value `minimal` is derived from can change.
//
// The fix was to record a Capture from a maybefrozen value as an ImmutableCapture
// which doesn't propagate mutations
dateTimeFormat({timeZone});
return format;
}

```

## Code

```javascript
import { c as _c } from "react/compiler-runtime";
export function useFormatRelativeTime(t0) {
const $ = _c(1);
const opts = t0 === undefined ? {} : t0;
const { timeZone, minimal } = opts;
let t1;
if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
t1 = function formatWithUnit() {};
$[0] = t1;
} else {
t1 = $[0];
}
const format = t1;

dateTimeFormat({ timeZone });
return format;
}

```

### Eval output
(kind: exception) Fixture not implemented
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
export function useFormatRelativeTime(opts = {}) {
const {timeZone, minimal} = opts;
const format = useCallback(function formatWithUnit() {}, [minimal]);
// We previously recorded `{timeZone}` as capturing timeZone into the object,
// then assumed that dateTimeFormat() mutates that object,
// which in turn could mutate timeZone and the object it came from,
// which meanteans that the value `minimal` is derived from can change.
//
// The fix was to record a Capture from a maybefrozen value as an ImmutableCapture
// which doesn't propagate mutations
dateTimeFormat({timeZone});
return format;
}
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