function IndicShaper() {
    return _DefaultShaper3.apply(this, arguments) || this;
  }
The IndicShaper supports indic scripts e.g. Devanagari, Kannada, etc.
Based on code from Harfbuzz: https://github.com/behdad/harfbuzz/blob/master/src/hb-ot-shape-complex-indic.cc