How to use the source-map.SourceNode function in source-map

}),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, ');\n'),
                ];
                break;
            case 'evaluate':
                code = [
                    ...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, '\n'),
                ];
                break;
        }
        return chunk.add(new source_map_1.SourceNode(node.start.line, node.start.column, sourceUrl, code));
    }, preamble)
        .add(new source_map_1.SourceNode(end.line, end.column, sourceUrl, [
        '  };\n',
        '\n',
        '  return __p;\n',
        '}\n',
    ]));
    const code = nodes.toStringWithSourceMap({
        file: sourceUrl,
        sourceRoot: options && options.sourceRoot || '.',
    });
    // Set the source content in the source map, otherwise the sourceUrl is not enough
    // to find the content.
    code.map.setSourceContent(sourceUrl, ast.content);
    return code.code
        + '\n//# sourceMappingURL=data:application/json;base64,'
        + new Buffer(code.map.toString()).toString('base64');
}

// Stop emitting when we have found the beginning of the string to replace.
				// Emit the part of the string before splitPosition
				if(splitPosition > 0) {
					var nodeStart = new SourceNode(
						mapping.line,
						originalColumn,
						mapping.source,
						nodePart,
						mapping.name
					);
					output.push(nodeStart);
				}

				// Emit the replacement value
				if(replace.value) {
					output.push(new SourceNode(
						mapping.line,
						mapping.column,
						mapping.source,
						replace.value,
						mapping.name || replace.name
					));
				}
			}

			// Recurse with remainder of the string as there may be multiple replaces within a single node
			node = node.substr(splitPosition);
			position += splitPosition;
		} while (true);
	}
}

node,
		position,
		mapping
	) {
		let original = undefined;

		do {
			let splitPosition = replace.position - position;
			// If multiple replaces occur in the same location then the splitPosition may be
			// before the current position for the subsequent splits. Ensure it is >= 0
			if (splitPosition < 0) {
				splitPosition = 0;
			}
			if (splitPosition >= node.length || replace.done) {
				if (replace.emit) {
					const nodeEnd = new SourceNode(
						mapping.line,
						mapping.column,
						mapping.source,
						node,
						mapping.name
					);
					output.push(nodeEnd);
				}
				return position + node.length;
			}

			const originalColumn = mapping.column;

			// Try to figure out if generated code matches original code of this segement
			// If this is the case we assume that it's allowed to move mapping.column
			// Because getOriginalSource can be expensive we only do it when neccessary

}),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, ';\n'),
                ];
                break;
            case 'interpolate':
                code = [
                    new source_map_1.SourceNode(node.start.line, node.start.column, sourceUrl, '__p += ((__t = '),
                    ...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, ') == null ? "" : __t);\n'),
                ];
                break;
            case 'escape':
                code = [
                    new source_map_1.SourceNode(node.start.line, node.start.column, sourceUrl, '__p += __e('),
                    ...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, ');\n'),
                ];
                break;
            case 'evaluate':
                code = [
                    ...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, '\n'),
                ];
                break;
        }
        return chunk.add(new source_map_1.SourceNode(node.start.line, node.start.column, sourceUrl, code));

...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, ');\n'),
                ];
                break;
            case 'evaluate':
                code = [
                    ...node.expression.split('\n').map((line, i, arr) => {
                        return new source_map_1.SourceNode(node.start.line + i, i == 0 ? node.start.column : 0, sourceUrl, line + ((i == arr.length - 1) ? '' : '\n'));
                    }),
                    new source_map_1.SourceNode(node.end.line, node.end.column, sourceUrl, '\n'),
                ];
                break;
        }
        return chunk.add(new source_map_1.SourceNode(node.start.line, node.start.column, sourceUrl, code));
    }, preamble)
        .add(new source_map_1.SourceNode(end.line, end.column, sourceUrl, [

lines.map(function(line, idx) {
				var pos = 0;
				if(options.columns === false) {
					var content = line + (idx != lines.length - 1 ? "\n" : "");
					return new SourceNode(idx + 1, 0, name, content);
				}
				return new SourceNode(null, null, null,
					_splitCode(line + (idx != lines.length - 1 ? "\n" : "")).map(function(item) {
						if(/^\s*$/.test(item)) return item;
						var res = new SourceNode(idx + 1, pos, name, item);
						pos += item.length;
						return res;
					})
				);
			})
		);

function templateWithSourceMap(ast, options) {
    const sourceUrl = ast.fileName;
    const module = options && options.module ? 'module.exports.default =' : '';
    const reHtmlEscape = reUnescapedHtml.source.replace(/[']/g, '\\\\\\\'');
    const preamble = (new source_map_1.SourceNode(1, 0, sourceUrl, ''))
        .add(new source_map_1.SourceNode(1, 0, sourceUrl, [
        `return ${module} function(obj) {\n`,
        '  obj || (obj = {});\n',
        '  let __t;\n',
        '  let __p = "";\n',
        `  const __escapes = ${JSON.stringify(kHtmlEscapes)};\n`,
        `  const __escapesre = new RegExp('${reHtmlEscape}', 'g');\n`,
        `\n`,
        `  const __e = function(s) { `,
        `    return s ? s.replace(__escapesre, function(key) { return __escapes[key]; }) : '';`,
        `  };\n`,
        `  with (obj) {\n`,
    ]));
    const end = ast.children.length
        ? ast.children[ast.children.length - 1].end
        : { line: 0, column: 0 };
    const nodes = ast.children.reduce((chunk, node) => {

async function createOutFiles(sourcePath) {
            //transform the file (by adding extra newlines
            let result = new SourceNode(null, null, sourcePath, [
                new SourceNode(1, 0, sourcePath, 'function main()\n'),
                '\n',
                new SourceNode(2, 0, sourcePath, '    print "hello"\n'),
                '\n',
                new SourceNode(3, 0, sourcePath, '    print "world"\n'),
                '\n',
                new SourceNode(4, 0, sourcePath, 'end function\n')
            ]).toStringWithSourceMap();
            await fsExtra.writeFile(outFilePath, result.code);
            await fsExtra.writeFile(outFileMapPath, result.map);
        }

const onSourceMapReady = consumedMap => {
    const node = new SourceNode(null, null, null, [
      SourceNode.fromStringWithSourceMap(source, consumedMap),
      new SourceNode(null, null, resourcePath, appendText),
    ]).join(separator);
    const result = node.toStringWithSourceMap();
    callback(null, result.code, result.map.toJSON() || undefined);
  };

function createAnonymousSourceNode(children) {
    return new SourceNode(
        null,
        null,
        null,
        children
    );
}