code: function breakInsideToken(tokens, tokenIndex, breakIndex, removeBreakChar) {
      let newBreakToken = {
          type: TYPE_NEWLINE
      };
      let newTextToken = {
          type: TYPE_TEXT,
          value: tokens[tokenIndex].value.substring(breakIndex + (removeBreakChar ? 1 : 0))
      };
      tokens.splice(tokenIndex + 1, 0, newBreakToken, newTextToken);
      return tokens[tokenIndex].value.substring(0, breakIndex);
  }
docs: Create new tokens and insert them into the stream
  @param {object[]} tokens
  @param {int} tokenIndex Token being processed
  @param {int} breakIndex Index within current token's value
  @param {bool} removeBreakChar Do we want to remove the breaking character?
  @returns {string} remaining unbroken token value