var splitStringTransformer = function splitStringTransformer(splitBy) {
  if (typeof splitBy !== 'string') {
    throw new Error('You need to specify a string character to split by.');
  }

  return {
    onSubstitution: function onSubstitution(substitution) {
      if (typeof substitution === 'string' && substitution.includes(splitBy)) {
        return substitution.split(splitBy);
      }

      return substitution;
    }
  };
};

export default splitStringTransformer;
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