src/vs/editor/common/model/textModel.ts/TextModel/getEndOfLineSequence
class TextModel:	public getEndOfLineSequence(): model.EndOfLineSequence {
		this._assertNotDisposed();
		return (
			this._buffer.getEOL() === '\n'
				? model.EndOfLineSequence.LF
				: model.EndOfLineSequence.CRLF
		);
	}