[Compiler Bug]: "Internal error: MethodCall::property must be an unpromoted..." on specific Math.floor, Math.ceil usages

[deivshon]

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/#N4Igzg9grgTgxgUxALhASwLYAcIwC4AEwBAZgHYEC+pMEGBAOiADZoBGTDZXCAHjvgJwIZMIQBCtANYIyARgIBeAgAoAlEoB8RLgSEixBAG4BDZlARLSZdboIwEeWBQA8AEzRHNwALIm8ABYAdCTMELgqfoFBJmxgKqbmCGpqlC4A9B5ednq5jGSUXDz8uITCohLSsgBMVupaOhT6FcZmFlbktk0OTjCuWd5RwYhozJH+wbHxiRYpaZmemkUFXCCUQA

Repro steps

1. Save a value computed using a function into a variable in render
2. Use said variable in one of these expressions in render: Math.floor(Math.abs(value)) or Math.ceil(Math.abs(value))

How often does this bug happen?

Every time

What version of React are you using?

19.1

What version of React Compiler are you using?

c260b38

[josephsavona]

Thanks for posting. On our backlog to fix! Iirc it’s a specific interaction w functions on globals that return primitive values - so nested Math operations like floor/ceil/abs/max.