This is a reference entry from TypeScript diagnosticMessages.json. A full explanation with fixes has not been written yet.
Base constructors must all have the same return type.
{0}, {1} and so on are filled in by the compiler.
- Category
- Error
- Severity
- error
or press Cmd/Ctrl + Enter. The text is only sent to this site to match it.
Source: TypeScript diagnosticMessages.json. Data fetched 2026-09-25T01:43:12.672Z.