How to use 'express res.sendfile' in JavaScript

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86function sendFile(filePath: string, response: http.ServerResponse,
87 alternatePath: string = "", isDynamic: boolean = false) {
88 var extension = path.extname(filePath);
89 var contentType = CONTENT_TYPES[extension.toLowerCase()] || 'application/octet-stream';
90
91 getContent(filePath, function(error, content) {
92 if (error) {
93 logging.getLogger().error(error, 'Unable to send static file: %s', filePath);
94
95 if (alternatePath != "") {
96 sendDataLabFile(alternatePath, response);
97 } else {
98 response.writeHead(500);
99 response.end();
100 }
101 }
102 else {
103 if (isDynamic) {
104 response.removeHeader('Cache-Control');
105 response.setHeader('Cache-Control', 'no-cache');
106 }
107 response.writeHead(200, { 'Content-Type': contentType });
108 response.end(content);
109 }
110 }, isDynamic);
111}

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