fs.readFile(file, 'utf8', (err, data) => {
		if (err) {
			tl.error(`Could not read file ${filePath}. Error is ${err.message}`);
			tl.exit(1);
		} 
		
		var reg = new RegExp(tokenRegex, "g");
		console.info(`Starting regex replacement in ${file}`);
		// loop through each match
		var match: RegExpExecArray;
		while((match = reg.exec(data)) !== null) {
			// find the variable value in the environment
			var varName = match[1];
			var varValue = tl.getVariable(varName);
			if (typeof varValue === 'undefined') {
				tl.warning(`... token ${varName} does not have an environment value`);
			} else {
				data = data.replace(match[0], varValue);
				tl.debug(`... replaced token ${varName}`);
			}
		}
		console.info("Writing new values to file");
		fs.writeFileSync(file, data);
		
		tl.debug("Leaving Replace Tokens step");
	});

    console.info(`Starting regex replacement in [${file}]`);
	
	var contents = fs.readFileSync(file, 'utf8').toString();
    var reg = new RegExp(tokenRegex, "g");
            
    // loop through each match
    var match: RegExpExecArray;
    while((match = reg.exec(contents)) !== null) {
        var vName = match[1];
        if (typeof secretTokens[vName.toLowerCase()] !== "undefined") {
			// try find the variable in secret tokens input first
            contents = contents.replace(match[0], secretTokens[vName.toLowerCase()]);
            tl.debug(`Replaced token [${vName}] with a secret value`);
        } else {
			// find the variable value in the environment
            var vValue = tl.getVariable(vName);
            if (typeof vValue === 'undefined') {
                tl.warning(`Token [${vName}] does not have an environment value`);
            } else {
                contents = contents.replace(match[0], vValue);
                tl.debug(`Replaced token [${vName }]`);
            }           
        }
    }
    console.info("Writing new values to file");
    
    // make the file writable
    sh.chmod(666, file);
    fs.writeFileSync(file, contents);
}

if (!artifactName) {
    // nothing to do
    tl.warning('Artifact name is not specified.');
}
else if (!artifactType) {
    // nothing to do
    tl.warning('Artifact type is not specified.');
}
else {
    artifactType = artifactType.toLowerCase();
    // back compat. remove after 82
    if (artifactType === "localpath") {
        artifactType = "filepath";
    }
    
    var stagingFolder: string = tl.getVariable('build.stagingdirectory');
    stagingFolder = path.join(stagingFolder, artifactName);
    
    console.log('Cleaning staging folder: ' + stagingFolder);
    tl.rmRF(stagingFolder); 

    tl.debug('Preparing artifact content in staging folder ' + stagingFolder + '...');

    // enumerate all files
    
    var files: string[] = [];
    var allFiles: string[] = tl.find(findRoot);
    if (contents && allFiles) {
        tl.debug("allFiles contains " + allFiles.length + " files");

        // a map to eliminate duplicates