add proposed.terminalShellType.d.ts from @Tyriar in API to access the…

… shell type for a given terminal microsoft#230165

src/vs/platform/extensions/common/extensionsApiProposals.ts

@@ -349,6 +349,9 @@ const _allApiProposals = {
 	terminalSelection: {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.terminalSelection.d.ts',
 	},
+	terminalShellType: {
+		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.terminalShellType.d.ts',
+	},
 	testObserver: {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.testObserver.d.ts',
 	},

src/vscode-dts/vscode.proposed.terminalShellType.d.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+
+	// https://github.com/microsoft/vscode/issues/230165
+
+	/**
+	 * Known terminal shell types.
+	 */
+	export enum TerminalShellType {
+		Sh = 1,
+		CommandPrompt,
+		PowerShell,
+		GitBash,
+		Bash,
+		Zsh,
+		Python,
+		Julia,
+		NuShell,
+		Fish,
+		Csh,
+		Ksh
+	}
+
+	// NOTE: State since this the shellType can change multiple times and this comes with an event.
+	export interface TerminalState {
+		/**
+		 * The current detected shell type of the terminal. New shell types may be added in the
+		 * future in which case they will be returned as a number that is not part of
+		 * {@link TerminalShellType}.
+		 * TODO: number is to prevent the breaking change when new enum members are added?
+		 */
+		readonly shellType?: TerminalShellType | number | undefined;
+	}
+
+}