other lambda functions are in .middleware.

[kim00425]

getItems:
  handler: src/serverless/items/handler.getItems
  events:
    - http:
        path: items
        method: get
        cors: true
  middleware:
    pre:
      - src/middleware/index.checkHeader

setItems:
  handler: src/serverless/items/handler.setItesm
  events:
    - http:
        path: items
        method: post
        cors: true
  middleware:
    pre:
      - src/middleware/index.checkHeader

when applying the code above, in the code of getItems, there are setItems.js and map files in .middleware, setItems also has js and map files for getItems.

what should i check more?

[juanjoDiaz]

I don't understand the problem.
All lambdas using middleware should be present in .middleware.