E0318: function overload signature cannot have generator '*'

In TypeScript, functions can have overload signatures. Overload signatures work on generator functions, but it is a syntax error for an overload signature itself to have the generator * after the function keyword:

function* keys<T>(a: T[]): number[];
function* keys(a: object): string[];
function* keys(a: object) {
  if (Array.isArray(a)) {
    for (let k in a) yield +k;
  } else {
    for (let k in a) yield k;
  }
}

To fix this error, remove the * from the overload signatures, but keep it for the implementation:

function keys<T>(a: T[]): number[];
function keys(a: object): string[];
function* keys(a: object) {
  if (Array.isArray(a)) {
    for (let k in a) yield +k;
  } else {
    for (let k in a) yield k;
  }
}

Introduced in quick-lint-js version 2.10.0.

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