src/vs/workbench/contrib/terminal/browser/terminalConfigHelper.ts/TerminalConfigHelper/_isExtensionInstalled
class TerminalConfigHelper:	private async _isExtensionInstalled(id: string): Promise<boolean> {
		const extensions = await this._extensionManagementService.getInstalled();
		return extensions.some(e => e.identifier.id === id);
	}