Youtube subtitles to text

main.ts

const subtitle = segToSub(subtitles.events);
console.log(subtitle);

seg-to-sub.ts

function segToSub(segments: SubtitleEvent[], withTime: false): string[];
function segToSub(segments: SubtitleEvent[], withTime: true): SubtitleTimed[];
function segToSub(segments: SubtitleEvent[], withTime = false) {
  return segments.map(({ tStartMs, dDurationMs, segs = [] }) => {
    return withTime
      ? {
          start: tStartMs,
          duration: dDurationMs,
          text: segs.map((seg) => seg.utf8).join(''),
        }
      : segs.map((seg) => seg.utf8).join('');
  });
}

types.ts

export interface Subtitles {
  wireMagic: string;
  pens: Pen[];
  wsWinStyles: WsWinStyle[];
  wpWinPositions: WpWinPosition[];
  events: SubtitleEvent[];
}

export interface SubtitleEvent {
  tStartMs: number;
  dDurationMs?: number;
  id?: number;
  wpWinPosId?: number;
  wsWinStyleId?: number;
  wWinId?: number;
  segs?: Seg[];
  aAppend?: number;
}

export interface Seg {
  utf8: string;
  acAsrConf?: number;
  tOffsetMs?: number;
}

export interface Pen {}

export interface WpWinPosition {
  apPoint?: number;
  ahHorPos?: number;
  avVerPos?: number;
  rcRows?: number;
  ccCols?: number;
}

export interface WsWinStyle {
  mhModeHint?: number;
  juJustifCode?: number;
  sdScrollDir?: number;
}

interface SubtitleTimed {
  start: number;
  duration: number;
  text: string;
}