Combine in action post's source code

cia1.swift

import Foundation
import Combine

struct Repo: Decodable {
    var id: Int
    let owner: Owner
    let name: String
    let description: String

    struct Owner: Decodable {
        let avatar: URL

        enum CodingKeys: String, CodingKey {
            case avatar = "avatar_url"
        }
    }
}

struct SearchResponse: Decodable {
    let items: [Repo]
}

class GithubService {
    private let session: URLSession
    private let decoder: JSONDecoder

    init(session: URLSession = .shared, decoder: JSONDecoder = .init()) {
        self.session = session
        self.decoder = decoder
    }
}

extension GithubService {
    func search(matching query: String) -> AnyPublisher<[Repo], Error> {
        guard
            let url = URL(string: "https://api.github.com/search/repositories?q=\(query)")
            else { preconditionFailure("Can't create url for query: \(query)") }
        
        return session.dataTaskPublisher(for: url)
            .map { $0.data }
            .decode(type: SearchResponse.self, decoder: decoder)
            .map { $0.items }
            .eraseToAnyPublisher()
    }
}