Variable Resolution Error When Running Offline Plugin

[JeffBeltran]

Issue Description

When running the serverless application offline, I encounter the following error:

Cannot resolve serverless.yml: Variables resolution errored with:
  - Cannot resolve variable at "provider.environment.FOO_BAR": Value not found at "self" source

This issue is similar to #1227 (at least with the setup of ENV's), but with a different error message.

Environment

• Node Version: 20.10.0
• Serverless Version: 3.39.0
• Plugin Version: 13.6.0

Configuration

Here's my truncated serverless.yml:

frameworkVersion: "3"

provider:
  name: aws
  runtime: nodejs20.x
  stage: ${opt:stage, self:custom.defaultStage}
  profile: ${opt:profile, self:custom.profiles.${self:provider.stage}}
  environment:
    FOO_BAR: ${self:custom.environmentVariables.${self:provider.stage}.foo.bar}

functions:
  siteReviews:
    handler: src/siteReviews.handler
    events:
      - schedule: rate(1 minute)

custom:
  defaultStage: "development"
  profiles:
    development: "redacted-dev"
    production: "redacted-prod"
  environmentVariables:
    production:
      foo:
        bar: "baz"

plugins:
  - serverless-esbuild
  - serverless-offline

Attempted Solutions

1. I've tried to manually set the stage to "production" using the serverless-offline configuration:

custom:
  # ... (previous custom configuration)
  serverless-offline:
    stage: "production"

However, I'm still encountering the same error.

2. I discovered that removing ${self:provider.stage} from the FOO_BAR environment variable definition works:

provider:
  # ... (other provider settings)
  environment:
    FOO_BAR: ${self:custom.environmentVariables.foo.bar}

This suggests that the issue is specifically related to resolving ${self:provider.stage} when running offline.

Question

How can I resolve this variable resolution error when running the serverless application offline, particularly when using ${self:provider.stage} in environment variable definitions?