E0317: newline is not allowed between 'async' and 'function'

Async functions have the async keyword followed by the function keyword. It is a syntax error to include a line break in between async and function:

function fetch(o: JSONOptions): Promise<object>;
function fetch(o: StreamOptions): Promise<Stream>;
async
function fetch(options): Promise<any> {
  /* ... */
}

To fix this error, put function on the same line as async:

function fetch(o: JSONOptions): Promise<object>;
function fetch(o: StreamOptions): Promise<Stream>;
async function fetch(options): Promise<any> {
  /* ... */
}

Introduced in quick-lint-js version 2.10.0.

Documentation for other errors