Function createDebug

packages/hardhat-utils/src/debug.ts:52–83

(namespace: string)

 * @returns Logger function, or a shared no-op if disabled.
 */
export function createDebug(namespace: string): DebugLogger {
  if (!isEnabled(namespace, process.env.DEBUG ?? "")) {
    return NOOP;
  }

  const colors = useColors();
  const color = colors ? selectColor(namespace) : undefined;
  const prefix =
    color !== undefined
      ? `\x1b[38;5;${color};1m  ${namespace}\x1b[0m`
      : `  ${namespace}`;
  const suffixOpen = color !== undefined ? `\x1b[38;5;${color}m` : "";
  const suffixClose = color !== undefined ? `\x1b[0m` : "";
  let prev = 0;

  const logger = (format: unknown, ...args: unknown[]): void => {
    const now = Date.now();
    const diff = prev === 0 ? 0 : now - prev;
    prev = now;

    const body =
      args.length === 0 && typeof format === "string"
        ? format
        : formatWithOptions({ colors }, format, ...args);

    process.stderr.write(
      `${prefix} ${body} ${suffixOpen}+${diff}ms${suffixClose}\n`,
    );
  };

  return Object.assign(logger, { enabled: true });
}