E0264: expected at least one parameter in generic parameter list

In a TypeScript generic class, function, or type alias, the generic parameter list is a comma-separated list of variables surrounded by < and >. It is a syntax error for the parameter list to be empty:

function api<>(endpoint: string): APIResult {
  // ...
}

function flattenArray<>(arrays: T[][]): T[] {
  // ...
}

To fix this error, remove < and >:

function api(endpoint: string): APIResult {
  // ...
}

Alternatively, write a type variable name inside the brackets:

function flattenArray<T>(arrays: T[][]): T[] {
  // ...
}

Introduced in quick-lint-js version 2.8.0.

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