async function _extractAdvinst(sourceMsi: string): Promise<string> {
  console.log(taskLib.loc("AI_ExtractTool"));

  // Ensure the c:\windows\installer folder exists. MSIEXEC will fail on some clients (E.g. Hosted VS2017)
  // due to the lack of this folder.

  let windowsInstallerFolder = path.join(taskLib.getVariable('windir'), 'Installer');
  if (!taskLib.exist(windowsInstallerFolder)) {
    taskLib.debug(taskLib.loc("AI_CreateInstallerFolder"))
    taskLib.mkdirP(windowsInstallerFolder);
  }

  let advinstWorkFolder = path.join(_getAgentTemp(), 'AdvancedInstaller');
  let msiExtractionPath: string = path.join(advinstWorkFolder, 'resources');
  // Create the work folder, otherwise msiexec will fail because of the log path.
  if (!taskLib.exist(advinstWorkFolder))
    taskLib.mkdirP(advinstWorkFolder);
  let msiLogPath: string = path.join(advinstWorkFolder, 'advinst_install.log');

  let msiexecArguments: string[] = ['/a', sourceMsi, 'TARGETDIR=' + msiExtractionPath, '/qn', '/l*v', msiLogPath];

  let exitCode = taskLib.execSync('msiexec.exe', msiexecArguments).code;
  if (exitCode != 0) {
    taskLib.command('task.uploadfile', {}, msiLogPath);
    return null;
  }
  return msiExtractionPath;
}

// For non LTS versions of Node, the files we need (for Windows) are sometimes located
// in a different folder than they normally are for other versions.
// Normally the format is similar to: https://nodejs.org/dist/v5.10.1/node-v5.10.1-win-x64.7z
// In this case, there will be two files located at:
//      /dist/v5.10.1/win-x64/node.exe
//      /dist/v5.10.1/win-x64/node.lib
// If this is not the structure, there may also be two files located at:
//      /dist/v0.12.18/node.exe
//      /dist/v0.12.18/node.lib
// This method attempts to download and cache the resources from these alternative locations.
// Note also that the files are normally zipped but in this case they are just an exe
// and lib file in a folder, not zipped.
async function acquireNodeFromFallbackLocation(version: string): Promise<string> {
    // Create temporary folder to download in to
    let tempDownloadFolder: string = 'temp_' + Math.floor(Math.random() * 2000000000);
    let tempDir: string = path.join(taskLib.getVariable('agent.tempDirectory'), tempDownloadFolder);
    taskLib.mkdirP(tempDir);
    let exeUrl: string;
    let libUrl: string;
    try {
        exeUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.exe`;
        libUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.lib`;

        await toolLib.downloadTool(exeUrl, path.join(tempDir, "node.exe"));
        await toolLib.downloadTool(libUrl, path.join(tempDir, "node.lib"));
    }
    catch (err) {
        if (err['httpStatusCode'] && 
            err['httpStatusCode'] === '404')
        {
            exeUrl = `https://nodejs.org/dist/v${version}/node.exe`;
            libUrl = `https://nodejs.org/dist/v${version}/node.lib`;

            await toolLib.downloadTool(exeUrl, path.join(tempDir, "node.exe"));
            await toolLib.downloadTool(libUrl, path.join(tempDir, "node.lib"));
        }
        else {
            throw err;
        }
    }
    return await toolLib.cacheDir(tempDir, 'node', version);
}

async function acquireTfx(version: string): Promise<string> {
    try{
        version = toolLib.cleanVersion(version);
        
        let extPath: string;
        taskLib.assertAgent('2.115.0');
        extPath = taskLib.getVariable('Agent.TempDirectory');
        if (!extPath) {
            throw new Error('Expected Agent.TempDirectory to be set');
        }
        extPath = path.join(extPath, 'tfx'); // use as short a path as possible due to nested node_modules folders

        taskLib.mkdirP(path.join(extPath));
        const npmRunner = new tr.ToolRunner("npm");
        npmRunner.arg(["install", "tfx-cli@" + version, "--prefix", extPath]);

        const result = npmRunner.execSync({ failOnStdErr: false, silent: true, ignoreReturnCode: false} as tr.IExecOptions);
        if (result.code === 0)
        {
            if (os.platform() === "win32")
            {
                fs.unlinkSync(path.join(extPath, "/tfx"));
            }
            return await toolLib.cacheDir(extPath, 'tfx', version);
        }
    }
    catch {
        return Promise.reject(new Error("Failed to install tfx"));
    }
}

export function getTempPath(): string {
    const tempNpmrcDir
        = tl.getVariable('Agent.BuildDirectory')
        || tl.getVariable('Agent.TempDirectory');
        const tempPath = path.join(tempNpmrcDir, 'npm');
    if (tl.exist(tempPath) === false) {
        tl.mkdirP(tempPath);
    }

    return tempPath;
}

    constructor(packageType: string, installationPath: string) {
        try {
            tl.exist(installationPath) || tl.mkdirP(installationPath);
        }
        catch (ex) {
            throw tl.loc("UnableToAccessPath", installationPath, JSON.stringify(ex));
        }

        this.packageType = packageType;
        this.installationPath = installationPath;
    }

export function getPypircPath(): string {
    let pypircPath: string;
    if (tl.getVariable("PYPIRC_PATH")) {
        pypircPath = tl.getVariable("PYPIRC_PATH");
    }
    else {
       let tempPath = tl.getVariable("Agent.TempDirectory");
       tempPath = path.join(tempPath, "twineAuthenticate");
       tl.mkdirP(tempPath);
       let savePypircPath = fs.mkdtempSync(tempPath + path.sep);
       pypircPath = savePypircPath + path.sep + ".pypirc";
    }
    return pypircPath;
}

		feedConnection.getCoreApi().restClient.get(packageUrl, ApiVersion, null, { responseIsCollection: false }, async function (error, status, result) {
			if (!!error || status != 200) {
				return reject(tl.loc("FailedToGetPackageMetadata", error));
			}

			var packageType = result.protocolType.toLowerCase();
			var packageName = result.name;

			if (packageType == "nuget") {
				
				var getDownloadUrlPromise = getDownloadUrl(packageConnection.getCoreApi().vsoClient, feedId, packageName, version)
				getDownloadUrlPromise.catch((error) => {
					return reject(error)
				});
				var downloadUrl = await getDownloadUrlPromise;
				
				if (!tl.exist(downloadPath)) {
					tl.mkdirP(downloadPath);
				}

				var zipLocation = path.resolve(downloadPath, "../", packageName) + ".zip";
				var unzipLocation = path.join(downloadPath, "");

				console.log(tl.loc("StartingDownloadOfPackage", packageName, zipLocation));
				
				var downloadNugetPackagePromise = downloadNugetPackage(packageConnection.getCoreApi(), downloadUrl, zipLocation);
				downloadNugetPackagePromise.catch((error) => {
					return reject(error)
				});
				await downloadNugetPackagePromise;

				console.log(tl.loc("ExtractingNugetPackage", packageName, unzipLocation));

				var unzipPromise = unzip(zipLocation, unzipLocation);
				unzipPromise.catch((error) => {
					return reject(error)
				});
				await unzipPromise;
				
				if (tl.exist(zipLocation)) {
					tl.rmRF(zipLocation);
				}

				return resolve();
			}
			else {
				return reject(tl.loc("PackageTypeNotSupported"));
			}
		});

function addDotNetCoreToolPath() {
    try {
        let globalToolPath: string = "";
        if (tl.osType().match(/^Win/)) {
            globalToolPath = path.join(process.env.USERPROFILE, Constants.relativeGlobalToolPath);
        } else {
            globalToolPath = path.join(process.env.HOME, Constants.relativeGlobalToolPath);
        }

        console.log(tl.loc("PrependGlobalToolPath"));
        tl.mkdirP(globalToolPath);
        tl.prependPath(globalToolPath);
    } catch (error) {
        //nop
        console.log(tl.loc("ErrorWhileSettingDotNetToolPath", JSON.stringify(error)));
    }
}

 beforeEach(() => {
     tl.mkdirP(destinationDir);
     tl.mkdirP(tempDir);
 });

 before(() => {
     tl.mkdirP(destinationDir);
 });