getLineStrings() {
    const flatCoordinates = this.flatCoordinates;
    const ends = this.ends_;
    const layout = this.layout;
    /** @type {Array<LineString>} */
    const lineStrings = [];
    let offset = 0;
    for (let i = 0, ii = ends.length; i < ii; ++i) {
      const end = ends[i];
      const lineString = new LineString(
        flatCoordinates.slice(offset, end),
        layout,
      );
      lineStrings.push(lineString);
      offset = end;
    }
    return lineStrings;
  }
Return the linestrings of this multilinestring.
@return {Array<LineString>} LineStrings.
@api