TextLine 
    Represents a line of text, such as a line of source code.
TextLine objects are immutable. When a document changes, previously retrieved lines will not represent the latest state.
Properties
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                  The offset of the first character which is not a whitespace character as defined by /\s/. Note that if a line is all whitespace the length of the line is returned.
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                  Whether this line is whitespace only, shorthand for TextLine.firstNonWhitespaceCharacterIndex === TextLine.text.length.
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                  The zero-based line number.
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                  The range this line covers with the line separator characters.