rollup-plugin-dev

a development server for rollup

why this plugin?

compared to other plugins, this plugin:

• uses Fastify to provide the server and implement features
  • while this means there are dependencies, it should also be trivial to add/modify to suit individual needs (see extend option below!)
• has additional features that may be useful
  • detailed logging of requests (see screenshot)
  • full proxy support
  • support for a basepath in the URL
  • will automatically turn itself off when watch mode isn't enabled

install

npm install --save-dev rollup-plugin-dev

pnpm add --save-dev rollup-plugin-dev

use

import dev from 'rollup-plugin-dev'

export default {
  plugins: [
    dev()
  ]
}

options

dirs

directories to serve static files from

example: dev('dist')
example: dev({ dirs: ['dist', 'lib'] })
default: __dirname

when no other options are needed, a shortcut is available to specify one folder

basePath

prefix all served files with a base path - e.g. serve from /static instead of /

example: dev({ basePath: '/static' })
default: /

silent

will silence all log messages, as well as the warning printed when rollup is started outside of watch mode

example: dev({ silent: true })
default: false

proxy

proxy a path to an upstream service

example: dev({ proxy: [{ from: '/api', to: 'http://localhost:9000/resources' }] })
example: dev({ proxy: [{ from: '/api', to: 'http://localhost:9000/resources', opts: { preHandler: myPreHandler } }] })
default: undefined

opts can contain any valid options for fastify-http-proxy

spa

serve a fallback page (for single-page apps)

example: dev({ spa: true }) // will serve index.html
example: dev({ spa: 'path/to/fallback.html' })
default: false

if a path is provided, it should be relative to one of the dirs being served

the fallback file must reside in one of the dirs being served

port

the port the server should listen on

example: dev({ port: 3000 })
default: 8080

the server will automatically listen on the first available port after 8080 if the specified/default port is taken

host

the host the server should listen on

example: dev({ host: '0.0.0.0' })
default: localhost

force

force the server to start, even if rollup isn't in watch mode

example: dev({ force: true })
default: false

dirname

the path to resolve any relative dirs from

example: dev({ dirname: '/Users/MyUser/Development/my-project' })
default: undefined

this is generally not needed if one is running Rollup from package.json's scripts

server

modify options the Fastify server is booted with - accepts any valid Fastify server attribute

example: dev({ server: { connectionTimeout: 3000 } })
default: see config.js and the serverDefaults export

here be dragons - because modifying these options can wildly change server behavior, this is supported on an 'as is' basis only

extend

enables full customization of the dev server, expects a Fastify plugin

example: dev({ extend: fp(async (server) => server.register(myPlugin)) })
default: undefined

onListen

this is a callback that runs after the server has started

example: dev({ onListen(server) { server.log.info('Hello world') } default: undefined