ts-r
  • Error
  • Reported by the lexer and parser

TS1477

An instantiation expression cannot be followed by a property access.

A generic function with explicit type arguments (an instantiation expression) is followed by `.property`. Wrap it in parentheses or drop the type arguments.

What it means

fn<string> without a call is an instantiation expression: it produces fn with its type parameters fixed. It can't be followed directly by a property access such as .name.

Example

index.ts
function id<T>(x: T): T {
  return x;
}

export const n = id<string>.name;
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(5,20): error TS1477: An instantiation expression cannot be followed by a property access.

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01. The example uses the default tsconfig: strict, target: es2022, module: esnext, moduleResolution: bundler.

How to fix

  • Wrap it: (id<string>).name.
  • Or access the property on the function itself: id.name.