Error "Class name cannot be 'Object' when targeting ES5 with module CommonJS." when not targeting es5

[CraigMacomber]

🔎 Search Terms

Object ES5 Error

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about this.

⏯ Playground Link

https://www.typescriptlang.org/play/?target=11&module=1&ts=5.9.0-dev.20250225#code/HYQwtgpgzgDiDGEAEANJBvJ8A2IpSQHkAjAKwngBcMBfJGoA

💻 Code

namespace X { class Object {} }

Target CommonJS and some new target, like ES2024.

🙁 Actual behavior

Class name cannot be 'Object' when targeting ES5 with module CommonJS.

Error mentions ES5 when ES5 is not being targeted.

🙂 Expected behavior

One of:

• No error
• Error mentions target being used
• Error does not mention target

Additional information about the issue

This same error happens with Node16 module resolution when module's format is CommonJS.