tmdbAPI.swift

import Foundation

struct Movie : Codable, Hashable {
  // ...
}

struct MovieResults : Codable, Hashable {
  let results: [Movie]
}

enum TMDBAPIError : Error {
  case invalidURL
}

class TDMBAPI {
  static let shared = TMDBAPI()

  func getPopularMovies() async throws -> [Movie] {
    guard let url = URL(string: "...") else {
      throw TMDBAPIError.invalidURL
    }

    let (data, _) = try await URLSession.shared.data(for: url)
    return JSONDecoder().decode(MovieResults.self, from: data).results
  }
}

Fairly sure MovieResults does not need to have Hashable however, I’ve added it anyway.