serverless.yml

service: simple-alternative-example

# Uncomment if you want to use Serverless' built-in dotenv feature instead Note:
# Serverless will load all env vars in `.env` in 3.0.0+
# https://www.serverless.com/framework/docs/environment-variables/
# useDotenv: true
variablesResolutionMode: 20210219

custom:
  # Do this if you only want to load env vars into the Serverless environment
  # This will make env vars available here and in any Serverless plugins
  dotenvVars: ${file(configs.js)}

plugins:
  - serverless-env-var-logger

provider:
  name: aws
  runtime: nodejs14.x
  lambdaHashingVersion: '20201221'
  # Do this if you want to load env vars into the Serverless environment AND
  # automatically configure all your functions with them.
  # This is usually not recommended to avoid loading secrets by accident (e.g. AWS_SECRET_ACCESS_KEY)
  environment: ${file(configs.js)}

functions:
  hello:
    handler: src/hello.handler
    environment:
      BAR: ${self:custom.dotenvVars.BAR}

      # The default value `''` is required if BAZ is not defined.
      # Leaving it out means you want Serverless to throw an error if the env
      # var is not set by either the system or in a dotenv file
      BAZ: ${self:custom.dotenvVars.BAZ, env:BAZ, ''}