Method prepend

packages/2d/src/lib/code/CodeSignal.ts:157–176

(
    first: string | number = 0.6,
    duration?: number,
  )

  public prepend(code: string, duration: number): ThreadGenerator;
  public prepend(duration?: number): TagGenerator;
  public prepend(
    first: string | number = 0.6,
    duration?: number,
  ): TOwner | ThreadGenerator | TagGenerator {
    if (typeof first === 'string') {
      if (duration === undefined) {
        const current = this.get();
        return this.set({
          progress: 0,
          fragments: [first, ...current.fragments],
        });
      } else {
        return this.prependTween(first, duration);
      }
    }

    const savedDuration = first;
    return (strings, ...tags) =>
      this.prepend(resolveCodeTag(CODE(strings, ...tags), true), savedDuration);
  }

  public insert(point: CodePoint, code: string): TOwner;
  public insert(