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TypeScript error

TS2637

Variance annotations are only supported in type aliases for object, function, constructor, and mapped types.

Reference entryTypeScriptFetched
This is a reference entry from TypeScript diagnosticMessages.json. A full explanation with fixes has not been written yet.

The error message

Variance annotations are only supported in type aliases for object, function, constructor, and mapped types.
As listed by TypeScript diagnosticMessages.json

{0}, {1} and so on are filled in by the compiler.

Details

Category
Error
Severity
error

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Source: TypeScript diagnosticMessages.json. Data fetched 2026-09-25T01:43:12.673Z.