How do I reference a function that is not in the root folder using the Serverless Framework?

Question

I'm using the Serverless Framework 1.x and I want to define my serverless.yml to reference a function that is located in another folder (not in the root level).

For example, in the following folder structure, I want to reference a handler() function that is defined in a function1.js file inside the folder functions.

serverless.yml
functions/
  function1.js
  function2.js
  function3.js
package.json
node_modules/
  ..

All examples that I see consider the following basic scenario where the file is in the root:

serverless.yml
handler.js

Where the serverless.yml file is defined by:

functions:
  hello:
    handler: handler.hello

Answer 1

The Serverless Framework access functions inside other folders using the following syntax:

folder/filename.function

So, if we have a file named function1.js with a function handler() that we want to execute when our Lambda function is invoked, we use the following definition inside the serverless.yml file:

service: example

functions:
  func1:
    handler: functions/function1.handler
  func2:
    handler: functions/function2.handler

The same would apply for multiple levels of folders:

folder/folder/folder/filename.function