serverless-plugin-env-stage-config

This Serverless plugin allows to define environment variable configuration files for stages. It exposes a new variable resolver ($esc) that automatically picks the correct value based on the selected stage. For development stages (local, dev, development), the variables will default to the system’s environment variables.

CI

Installation

pnpm add -D serverless-plugin-env-stage-config

plugins:
  - serverless-plugin-env-stage-config

Usage

For non-development stages, the variables will be retrieved from a serverless.env.${stage}.yml file, alongside the serverless.yml.

Let’s consider the following serverless.yml:

name: my-service

useDotenv: true

resources:
  Resources:
    MyQueue:
      Type: AWS::SQS::Queue
      Properties:
        QueueName: some-queue

provider:
  name: aws

  environment:
    MYSQL_HOST: ${esc:MYSQL_HOST}
    MYSQL_PORT: ${esc:MYSQL_PORT}

functions:
  run-something:
    handler: handler.run
    environment:
      QUEUE_URL: ${esc:QUEUE_URL}
      SECRET_TOKEN: ${esc:SECRET_TOKEN}

Local stages

In a local environment, the variables resolved with the esc: prefix will be equivalent to using env:. Using useDotenv: true alongside a .env file will alow you to define your environement variables.

The supported local stages are:

• local
• dev
• development

Other stages

If you need to define a different source for the environement variables for your prod stage, you can define a serverless.env.prod.yml to redefine the variables.

For example, if you’re using AWS SSM Parameter Store, you could create the following file:

MYSQL_HOST: ${ssm:/my-service/prod/MYSQL_HOST}
QUEUE_URL: !Ref MyQueue
SECRET_TOKEN: ${ssm:/my-service/prod/SECRET_TOKEN}

Any variable that is not included in the serverless.env.prod.yml file will produce a warning and fallback to using env:. In this case, you will get the following warning:

Serverless: env-stage-config: WARNING: the MYSQL_PORT variable is not defined in serverless.env.prod.yml, defaulting to ${env:MYSQL_PORT, null}.

If a variable is not defined in the stage environment configuration file, or the environment (process.env), it will default to null.

License

MIT

Miscellaneous

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