Function emitWarningOnce

src/utils.ts:1003–1008

(message: string)

 * @internal
 */
export function emitWarningOnce(message: string): void {
  if (!emittedWarnings.has(message)) {
    emittedWarnings.add(message);
    return emitWarning(message);
  }
}

/**
 * Takes a JS object and joins the values into a string separated by ', '