Nuke script to build and push an NPM package

build.cs

using System;
using System.IO;
using System.Linq;
using System.Text;
using Microsoft.VisualBasic;
using Nuke.Common;
using Nuke.Common.CI;
using Nuke.Common.Execution;
using Nuke.Common.IO;
using Nuke.Common.ProjectModel;
using Nuke.Common.Tooling;
using Nuke.Common.Tools.GitVersion;
using Nuke.Common.Tools.Npm;
using Nuke.Common.Utilities.Collections;
using static Nuke.Common.EnvironmentInfo;
using static Nuke.Common.IO.FileSystemTasks;
using static Nuke.Common.IO.PathConstruction;

class Build : NukeBuild
{
    /// Support plugins are available for:
    ///   - JetBrains ReSharper        https://nuke.build/resharper
    ///   - JetBrains Rider            https://nuke.build/rider
    ///   - Microsoft VisualStudio     https://nuke.build/visualstudio
    ///   - Microsoft VSCode           https://nuke.build/vscode

    public static int Main () => Execute<Build>(x => x.NpmPush);
    
    [GitVersion(NoFetch = true, UpdateBuildNumber = true, Framework = "net5.0")]
    readonly GitVersion GitVersion;
    
    [Parameter]
    readonly string NpmCiFeed = "//company.jfrog.io/company/api/npm/dev-npm-ci/";
    
    [Parameter]
    readonly string NpmReleaseFeed = "//company.jfrog.io/company/api/npm/dev-npm-release/";

    [Parameter]
    readonly string NpmFeedUsername;

    [Parameter]
    readonly string NpmFeedPassword;

    [Parameter("A branch specification, like refs/tags/1.0.0")]
    readonly string BranchSpec = "";
    
    AbsolutePath ArtifactsDirectory => RootDirectory / "artifacts";
    
    AbsolutePath SourceDirectory => RootDirectory / "src";

    Target Clean => _ => _
        .Executes(() =>
        {
            EnsureCleanDirectory(ArtifactsDirectory);
        });
    
    Target ConfigureNpm => _ => _
        .OnlyWhenStatic(() => !string.IsNullOrWhiteSpace(NpmFeedUsername))
        .OnlyWhenStatic(() => !string.IsNullOrWhiteSpace(NpmFeedPassword))
        .Executes(() =>
        {
            string npmFeed = BranchSpec.Contains("refs/tags/") ? NpmReleaseFeed : NpmCiFeed;
            
            var base64Password = Convert.ToBase64String(Encoding.UTF8.GetBytes(NpmFeedPassword));
            
            string contents = $@"
                @evision:registry=https:{npmFeed}
                {npmFeed}:_password={base64Password}
                {npmFeed}:username={NpmFeedUsername}
                {npmFeed}:email=prod-ops@mycompany.com
                {npmFeed}:always-auth=true
            ";
            
            File.WriteAllText(SourceDirectory / ".npmrc", contents);
        });
        
    Target NpmPack => _ => _
        .DependsOn(Clean)
        .Executes(() =>
        {
            EnsureExistingDirectory(ArtifactsDirectory);

            NpmTasks.Npm($"version {GitVersion.FullSemVer} --allow-same-version", SourceDirectory);
            NpmTasks.Npm($"pack {SourceDirectory} --loglevel=warn", ArtifactsDirectory);
        });

    Target NpmPush => _ => _
        .DependsOn(NpmPack)
        .DependsOn(ConfigureNpm)
        .OnlyWhenStatic(() => !string.IsNullOrWhiteSpace(NpmFeedUsername))
        .OnlyWhenStatic(() => !string.IsNullOrWhiteSpace(NpmFeedPassword))
        .Executes(() =>
        {
            NpmTasks.Npm($"publish", SourceDirectory);
        });
}