Add Uninstall-Package

src/AnyPackage.Npm.psm1

@@ -3,7 +3,7 @@ using namespace AnyPackage.Provider
 using namespace System.Management.Automation
 
 [PackageProvider('Npm')]
-class NpmProvider : PackageProvider, IGetPackage, IFindPackage, IInstallPackage {
+class NpmProvider : PackageProvider, IGetPackage, IFindPackage, IInstallPackage, IUninstallPackage {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingPositionalParameters', '')]
     [void] FindPackage ([PackageRequest] $request) {
         $npmPackages = npm search $request.Name --json | ConvertFrom-Json
@@ -74,6 +74,38 @@ class NpmProvider : PackageProvider, IGetPackage, IFindPackage, IInstallPackage
             $request.WritePackage($package)
         }
     }
+
+    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidGlobalVars', '')]
+    [void] UninstallPackage ([PackageRequest] $request) {
+        $getPackageParameters = @{
+            Name        = $request.Name
+            Provider    = $request.ProviderInfo.FullName
+            ErrorAction = 'SilentlyContinue'
+        }
+
+        if ($request.Version) {
+            $getPackageParameters['Version'] = $request.Version
+        }
+
+        $package = Get-Package @getPackageParameters
+
+        if (!$package) {
+            return
+        }
+
+        npm uninstall $request.Name -g 2>&1 |
+            ForEach-Object {
+                if ($_ -is [ErrorRecord]) {
+                    $request.WriteError($_)
+                } else {
+                    $request.WriteVerbose($_)
+                }
+            }
+
+        if ($LASTEXITCODE -eq 0) {
+            $request.WritePackage($package)
+        }
+    }
 }
 
 [guid] $id = '977f95d8-f85d-4ae3-95fd-d6b5b55ae70e'

test/Uninstall-Package.Tests.ps1

@@ -0,0 +1,14 @@
+#Requires -Modules AnyPackage.Npm
+
+Describe Uninstall-Package {
+    BeforeEach {
+        npm install posh-gulp -g
+    }
+
+    Context 'with -Name parameter' {
+        It 'should uninstall' {
+            Uninstall-Package -Name posh-gulp -PassThru |
+            Should -Not -BeNullOrEmpty
+        }
+    }
+}