Function withTimeout

src/services/lsp/LSPServerInstance.ts:499–511

* Race a promise against a timeout. Cleans up the timer regardless of outcome * to avoid unhandled rejections from orphaned setTimeout callbacks.

(
  promise: Promise<T>,
  ms: number,
  message: string,
)

 * to avoid unhandled rejections from orphaned setTimeout callbacks.
 */
function withTimeout<T>(
  promise: Promise<T>,
  ms: number,
  message: string,
): Promise<T> {
  let timer: ReturnType<typeof setTimeout>
  const timeoutPromise = new Promise<never>((_, reject) => {
    timer = setTimeout((rej, msg) => rej(new Error(msg)), ms, reject, message)
  })
  return Promise.race([promise, timeoutPromise]).finally(() =>
    clearTimeout(timer!),
  )
}