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20.0.5 • Public • Published


This package can transform a seagull app src/ directory into a deployable application bundle.

How to Build

Just run seagull-build within your seagull application. This should bundle all the pages, routes and serve you a lambda.js and a server.js file.

How to run a dev server

Just run seagull-dev and a server should start. The port can be configured by the PORT env, default is 8080. Once started, the server should rebuild the pages on the fly.

How does it work

Basically this whole package defines different steps, that are "wired" within the operators. There are 4 operators:

  • The releaseOperator - used for seagull-build app and composing the dist directory
  • The developmentOperator - serves the dev server, that can be used by seagull-dev
  • The pageOperator - serves all the pages with the build process
  • The lazyPageOperator - will only render pages that have changed

Within the operators you will find a wiring, that defines the event loop for the operators and when which event is triggered. Each of these Wirings has an attribute on or once and and attribute emit. on will fire everytime the event is triggered, once, as you might guessed it, only once. Emit defines function that is triggered by these.

Source Folder

The tool will read code from a seagull source code repository (cwd) and uses the following folder paths explicitly:

  • ${cwd}/src/pages - all *.tsx files here will be processed as Route
  • ${cwd}/src/routes - all *.ts files here will be processed as Page
  • ${cwd}/static - all files here will be copied as-is to the web root folder

Destination Folder

This tool will produce the following structure, given a target folder path:

  • ${folder}/backend - entry points for different backend environments
    • ${folder}/backend/lambda.js - when booted on AWS Lambda
    • ${folder}/backend/server.js - when booted directly as express.js app
  • ${folder}/dist/* - typescript compilation artifacts
  • ${folder}/pages - mirroring of the original /pages structure
    • ${folder}/pages/${pageName}.js - self-contained UMD-bundle of a Page
  • ${folder}/static - web root for static files, like favicon, ...


The web root for static files contains a vendor.js file, which bundles global dependencies for pages. The seagull default global dependencies can be altered by adding a new entry to the package.json of the seagull project:

  "seagull": {
    "vendorBundleIncludes": {
      "add": [
      "remove": [

A relevant case is the inclusion of sub-files of dependencies, like specific lodash functions via the following syntax:

include isEqual from 'lodash/isEqual'

These are not included by the default seagull global vendor dependencies.

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npm i @seagull/build

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