format flags.ts

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  import type {FlagOptions} from './types';
 
export const flags = (flag: string, opts?: FlagOptions): [prefix: string, blank: string, redraw: string] => {
  const prefix = flag + (opts?.initialTab ? '\t' : ' ');
  return [prefix, opts?.suppressBlankEmpty ? (flag === ' ' ? '' : flag) : prefix, prefix];
};