Using `use()` as name for custom hooks

[EricPierlotIdmog]

What kind of issue is this?

• React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization)
• babel-plugin-react-compiler (build issue installing or using the Babel plugin)
• eslint-plugin-react-compiler (build issue installing or using the eslint plugin)
• react-compiler-healthcheck (build issue installing or using the healthcheck script)

Link to repro

https://playground.react.dev

Bug Description

Context providers update state correctly, but consumers receive stale values when using React Compiler. Works without the compiler.

Repro: Click "Open Dialog" button
Expected: Dialog shows "Modal open!"
Actual: Dialog stays "Modal is closed" despite provider logging isOpen: true

Root Cause

The React Compiler incorrectly optimizes hooks called through namespace exports with .use() property names:

Broken: Modal.use() → Entire hook result cached, never re-evaluated

// Compiled output - WRONG
const ModalDialog = () => {
  let t0;
  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
    t0 = Modal.use(); // Only called once
    $[0] = t0;
  } else {
    t0 = $[0]; // Uses stale cached value
  }
  const { close, isOpen } = t0;

Working: Modal.useModal() → Individual values tracked correctly

// Compiled output - CORRECT
const ModalDialog = () => {
  const { close, isOpen } = Modal.useModal();
  if ($[0] !== close || $[1] !== isOpen) { // Proper dependency tracking
    $[0] = close;   
    $[1] = isOpen;
  }

Workaround

Use any property name other than .use() in namespace exports.

How often does this bug happen?

Every time

What version of React are you using?

19.1.0

What version of React Compiler are you using?

19.1.0-rc.2

[josephsavona]

Thanks for posting. use is not a valid name for custom hooks, and is only meant for the specific use() API provided by React. You can think of use() more like an keyword or operator than a hook (the closest analogue is await). So we would recommend either creating a hook named accordingly, or import {use} from 'react'.

[Shonferns004]

Hello! 👋 I came across issue and would love to work on this. I’ve set up the repo locally and started digging into it.

Just wanted to check in before starting — is anyone already working on this? If not, I’d love to take it up.

Thanks!