// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Composition;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.Host.Mef;

namespace Microsoft.CodeAnalysis.CSharp.Completion.Providers;

/// <summary>
/// Provides a completion provider that always appears before any built-in completion provider. This completion
/// provider does not provide any completions.
/// </summary>
[ExportCompletionProvider(nameof(FirstBuiltInCompletionProvider), LanguageNames.CSharp)]
[Shared]
internal sealed class FirstBuiltInCompletionProvider : CompletionProvider
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public FirstBuiltInCompletionProvider()
    {
    }

    public override Task ProvideCompletionsAsync(CompletionContext context)
        => Task.CompletedTask;
}