container compose doesn't support extends #7

 container-compose up   
Error: dataCorrupted(Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "services", intValue: nil), 
_DictionaryCodingKey(stringValue: "mongo", intValue: nil), CodingKeys(stringValue: "image", intValue: nil)], 
debugDescription: "Service must have either \'image\' or \'build\' specified.", underlyingError: nil))

 cat docker-compose.yml 
version: '3.1'

services:
    mongo:
      extends:
         file: ./dev/docker-compose/docker-mongo-replica-set/docker-compose.yml
         service: mongo-replica

    firebase-emulator:
        extends:
          file: ./dev/docker-compose/firebase-emulator/docker-compose.yml
          service: firebase-emulator
        container_name: firebase-emulator
        ports:
            - "4000:4000" #Emulator UI
            - "9099:9099" #Firebase Auth
            - "9199:9199" #Firebase Cloud Storage
            - "9000:9000" #Firebase Realtime database
        volumes:
            - ./dev/docker-compose/firebase-emulator/data:/firebase/data:rw
            - ./firebase.json:/firebase/firebase.json:ro

    firebase-emulator-itests: #this is only used for itests, to make sure dev-data is not wiped on the normal fb-emulator. Make sure to adjust your .env.testing-file accordingly
        extends:
          file: ./dev/docker-compose/firebase-emulator/docker-compose.yml
          service: firebase-emulator
        container_name: firebase-emulator-itests
        ports: #the host-ports have a leading `1` compared to the normal ports, make sure to use that port instead of the normal one in your .env.testing-file
          - "14000:14000" #Emulator UI
          - "19099:19099" #Firebase Auth
          - "19199:19199" #Firebase Cloud Storage
          - "19000:19000" #Firebase Realtime database
        volumes:
          # Mounting a different firebase.json-config into the container to make it run on different ports
          - ${PWD}/dev/docker-compose/firebase-emulator/firebase_itest.json:/firebase/firebase.json

networks:
  ev:
      name: ev

cat ./dev/docker-compose/docker-mongo-replica-set/docker-compose.yml                  
version: '3.8'

services:
  mongo-replica:
    build: .
    container_name: mongo-replica
    ports:
      - "27017:27017"
      - "27018:27018"
      - "27019:27019"
    volumes:
      - ./data/mongo1:/data/mongo1
      - ./data/mongo2:/data/mongo2
      - ./data/mongo3:/data/mongo3

container-compose up  
Error: dataCorrupted(Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "services", intValue: nil), _DictionaryCodingKey(stringValue: "mongo", intValue: nil), CodingKeys(stringValue: "image", intValue: nil)], debugDescription: "Service must have either \'image\' or \'build\' specified.", underlyingError: nil))