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serverless-offline-edge-lambda

A plugin for the Serverless Framework that simulates the behavior of AWS CloudFront Edge Lambdas while developing offline.

Setup

npm install --save-dev serverless
npm install --save-dev serverless-offline-edge-lambda

serverless.yml

service:
  name: edge-lambdas

plugins:
  - serverless-offline-edge-lambda

provider:
  name: aws
  runtime: nodejs12.x

functions:
  lambda:
    handler: src/handlers.onViewerRequest
    lambdaAtEdge:
      distribution: 'WebsiteDistribution'
      eventType: 'viewer-request'
      pathPattern: '/lambda'

resources:
  Resources:
    WebsiteDistribution:
      Type: 'AWS::CloudFront::Distribution'
      Properties:
        DistributionConfig:
          DefaultCacheBehavior:
npx serverless offline start --port=<port>

Use with serverless-offline

The plugin should not be used in conjunction with serverless-offline because both plugins define the offline command.

Use with serverless-plugin-cloudfront-lambda-edge

This plugin does not handle packaging and deploying edge lambdas to the cloud. Therefore this plugin can be used with serverless-plugin-cloudfront-lambda-edge. Again, doing so is optional. The schema in serverless.yml derives from that used by serverless-plugin-cloudfront-lambda-edge.

Use with Transpilers

This plugin can also be used with transpilers such as serverless-plugin-typescript. In the cases where the transpiler outputs built files to a path that differs from the path specified for the handlers (e.g. .build/src/handers.onViewerRequest), this plugin accepts a configuration option path that it uses to resolve function handlers.

plugins:
  - serverless-plugin-typescript

custom:
  offlineEdgeLambda:
    path: '.build'

For usage with serverless-webpack and serverless-bundle the config is similar but the build path changes.

plugins:
  - serverless-webpack # or serverless-bundle

custom:
  offlineEdgeLambda:
    path: './.webpack/service/'

Hot Reload Support

Hot reload for serverless-esbuild and serverless-plugin-typescript are available with extra configuration.

The watch/reload mechanism is available form serverless-webpack, but is disabled by default for esbuild and typescript.

The flag "watchReload: true" will turn on the watcher so that typescript and esbuild solutions use the watcher to hot reload the handlers. The path to the built handlers must be specified for the watcher to work correctly.

example:

custom:
  offlineEdgeLambda:
    path: '.esbuild/service'
    watchReload: true

Additional options can be used to modify the behavior of the file watcher and debounce logic (ignoreInitial, awaitWriteFinish, interval, debounce, and any other chokidar option).

example:

custom:
  offlineEdgeLambda:
    path: '.dist/service'
    watchReload: true
    ignoreInitial: true
    awaitWriteFinish: true
    interval: 500,
    debounce: 750

Options

--headersFile

Default: undefined

CloudFront injects some headers into the request. You can set these by creating a JSON file and passing its path as an option.

Example:

// .cf-headers.json
{
    "CloudFront-Viewer-Country": "us",
    "CloudFront-Viewer-Country-Region": "tx"
}
npx serverless offline start --headersFile .cf-headers.json