it's working

.vscode/launch.json

@@ -0,0 +1,14 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "attach",
+            "name": "Attach by Process ID",
+            "processId": "${command:PickProcess}"
+        }
+    ]
+}

client/extension.ts

@@ -15,56 +15,57 @@ const bundledModulesPath = path.join(cocPowerShellRoot, "PowerShellEditorService
 const logPath = path.join(cocPowerShellRoot, "/.pses/logs/1234");
 
 export function activate(context: ExtensionContext) {
+	setTimeout(function () {
+		const pwshPath = getDefaultPowerShellPath(getPlatformDetails())
 
-    const pwshPath = getDefaultPowerShellPath(getPlatformDetails())
-
-	let serverOptions: ServerOptions = { 
-		command: pwshPath, 
-		args: [
-            "-NoProfile",
-            "-NonInteractive",
-            path.join(bundledModulesPath, "/PowerShellEditorServices/Start-EditorServices.ps1"),
-            "-HostName", "coc.vim",
-            "-HostProfileId", "0",
-            "-HostVersion", "2.0.0",
-            "-LogPath", path.join(logPath, "log.txt"),
-            "-LogLevel", "Diagnostic",
-            "-BundledModulesPath", bundledModulesPath,
-            "-Stdio",
-            "-SessionDetailsPath", path.join(logPath, "session")],
-		transport: TransportKind.stdio
-	}
+		let serverOptions: ServerOptions = {
+			command: pwshPath,
+			args: [
+				"-NoProfile",
+				"-NonInteractive",
+				path.join(bundledModulesPath, "/PowerShellEditorServices/Start-EditorServices.ps1"),
+				"-HostName", "coc.vim",
+				"-HostProfileId", "0",
+				"-HostVersion", "2.0.0",
+				"-LogPath", path.join(logPath, "log.txt"),
+				"-LogLevel", "Diagnostic",
+				"-BundledModulesPath", bundledModulesPath,
+				"-Stdio",
+				"-SessionDetailsPath", path.join(logPath, "session")],
+			transport: TransportKind.stdio
+		}
+
+		workspace.addRootPatterns('ps1', ['*.ps1', '*.psd1', '*.psm1', '.vim', '.git', '.hg'])
 
-    workspace.addRootPatterns('powershell', ['*.ps1', '*.psd1', '*.psm1', '.vim', '.git', '.hg'])
-
-	// Options to control the language client
-	let clientOptions: LanguageClientOptions = {
-		// Register the server for F# documents
-		documentSelector: [{scheme: 'file', language: 'powershell'}],
-		synchronize: {
-			// Synchronize the setting section 'powershell' to the server
-			configurationSection: 'powershell',
-			// Notify the server about file changes to PowerShell files contain in the workspace
-			// TODO: is there a way to configure this via the language server protocol?
-			fileEvents: [
-				workspace.createFileSystemWatcher('**/*.ps1'),
-				workspace.createFileSystemWatcher('**/*.psd1'),
-				workspace.createFileSystemWatcher('**/*.psm1')
-			]
+		// Options to control the language client
+		let clientOptions: LanguageClientOptions = {
+			// Register the server for F# documents
+			documentSelector: [{ scheme: 'file', language: 'ps1' }],
+			synchronize: {
+				// Synchronize the setting section 'powershell' to the server
+				configurationSection: 'ps1',
+				// Notify the server about file changes to PowerShell files contain in the workspace
+				// TODO: is there a way to configure this via the language server protocol?
+				fileEvents: [
+					workspace.createFileSystemWatcher('**/*.ps1'),
+					workspace.createFileSystemWatcher('**/*.psd1'),
+					workspace.createFileSystemWatcher('**/*.psm1')
+				]
+			}
 		}
-	}
 
-	// Create the language client and start the client.
-	let client = new LanguageClient('powershell', 'PowerShell Language Server', serverOptions, clientOptions);
-	let disposable = client.start();
-
-	// Push the disposable to the context's subscriptions so that the 
-	// client can be deactivated on extension deactivation
-	context.subscriptions.push(disposable);
-    commands.registerCommand('powershell.command.goto', goto);
+		// Create the language client and start the client.
+		let client = new LanguageClient('ps1', 'PowerShell Language Server', serverOptions, clientOptions);
+		let disposable = client.start();
+
+		// Push the disposable to the context's subscriptions so that the 
+		// client can be deactivated on extension deactivation
+		context.subscriptions.push(disposable);
+		commands.registerCommand('powershell.command.goto', goto);
+	}, 10000);
 }
 
 function goto(file: string, startLine: number, startColumn: number, _endLine: number, _endColumn: number) {
 	let selection = Range.create(startLine, startColumn, startLine, startColumn);
-    workspace.jumpTo(file, selection.start);
+	workspace.jumpTo(file, selection.start);
 }

package.json

@@ -288,7 +288,8 @@
     },
     "extensionDependencies": [],
     "dependencies": {
-        "coc.nvim": "^0.0.71"
+        "coc.nvim": "^0.0.71",
+        "node-fetch": "^2.6.0"
     },
     "devDependencies": {
         "@types/node": "^10.3.3",