@americanexpress/holocron-dev-server
v0.2.4
Published
A micro-frontend dev server for Holocron Modules
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@americanexpress/holocron-dev-server
@americanexpress/holocron-dev-server
is an experimental development server
made for One App Holocron modules designed for enabling fast refresh and reloading of assets
while creating web experiences.
⚠️ holocron-dev-server
is a client-side only development server and does not run Holocron modules
as One App would normally. Holocron modules are not loaded into memory on the server, nor does it
server side render (only client side). There are other key differences, and as such, holocron-dev-server
does not behave the same as One App server.
If you are looking for a production-like environment
to run One App Holocron modules, @americanexpress/one-app-runner
would be the right tool of choice. This is because holocron-dev-server
only
provides a faster developer experience on the client side only, without the actual One App server.
📖 Table of Contents
✨ Features
- Runs One App Holocron modules on an experimental development server
- Fast refresh for Holocron modules, React components and styles are all hot loaded in the browser
- Zero-config start up with pre-existing
"one-amex"
configuration in thepackage.json
- Hot reload parrot scenarios and watch for changes
- Hot reload language packs and watch for changes from the local modules
- Combines the remote module if provided with the local module map remote module map with the universal map
- Local Holocron modules bundles/externals analyzed and reported using webpack bundle analyzer
Differences with One App
- Only works client side
- Does not server side render
Server Spec
express
server listening for requests: handling request types for navigation, static assets and parrot scenarios, on the same portwebpack
,webpack-dev-middleware
andwebpack-hot-middleware
load a configuration for fast refresh, added withreact-refresh
viababel
and@pmmmwh/react-refresh-webpack-plugin react-refresh
via webpack- virtual
memfs
is synced with unionfs to the filesystem, it connects with webpack dev serving local and remote static assets quickly from memory
🤹 Usage
Prerequisites
- Docker is required to load One App statics from development environment.
- React Dev tools browser extension is needed in your browser for fast refresh to work
Installation
npm install -D @americanexpress/holocron-dev-server
# or
yarn add -D @americanexpress/holocron-dev-server
Start Up
add the script in the package.json
of your Holocron module:
{
"scripts": {
"dev": "holocron-dev-server"
}
}
then run to start the development server:
npm run dev
# or
yarn dev
Once the command runs, the sandbox Holocron module reload server
will start up using the configuration found in the modules package.json
.
Zero-Config
holocron-dev-server
uses existing configurations from "one-amex"
to source what modules, externals and other configuration like
rootModuleName
are used.
The config uses one-amex.runner
(modules
, rootModuleName
, moduleMapUrl
, dockerImage
, envVars
)
and one-amex.bundler
(providedExternals
, requiredExternals
)
to set up the HMR environment for your Holocron module.
Default Values
In the case that certain configuration options are not present in the Holocron module config, there are default values that are used in its place.
- the root module name (
rootModuleName
) will use the current module if it is not defined. - the docker image (
dockerImage
) will default tooneamex/one-app-dev:latest
if not defined.
Parrot Scenarios
If a mock/scenarios.js
exists in your module,
the parrot
scenarios will be watched for changes and updated,
please note that the parrot browser extension will need to be changed to refer
to the port used by the holocron development server.
Language Packs
The same applies if locale/*
folder exists in your Holocron module.
When a given locale gets modified, the holocron dev server will notify the client
and will load the language pack into state.
Please note that if default fallback for loading the language pack is en-US
,
if any issue occurs while trying to load it.
🎛️ API
The API is subject to change
holocron-dev-server
Command line tool usage.
Usage
npx -p @americanexpress/holocron-dev-server -- holocron-dev-server
Configuration
hmr
Options
Use the one-amex.hmr
config for
more advanced configurations. The experimental hmr
config is
subject to change. The options supported are:
| name | type | required | default | value |
| --------------- | ------------------- | -------- | -------------- | ------------------------------------------------------------------------------------------- |
| logLevel
| Number or String
| false
| 4
or "info"
| "info"
or 4
, "log"
or 3
, "warn"
or 2
, "error"
or 1
, 0
for silent |
| sourceMap
| [Boolean, String]
| false
| "source-map"
| value passed to webpack's devtool configuration (eg inline-cheap-source-map
, false
) |
| clientConfig
| Object
| false
| {}
| the One App configuration in the store (store.get('config')
) |
| port
| Number
| false
| 4000
| the port that holocron-dev-server
binds to |
| openWhenReady
| Boolean
| false
| false
| Set to true
to enable opening your default browser when ready |
{
"one-amex": {
"hmr": {
"logLevel": "info",
"port": 4000,
"openWhenReady": false,
"sourceMap": "inline-cheap-source-map",
"clientConfig": {
"myClientSideConfig": "https://url"
}
}
}
}
Troubleshooting
There may be instances where fast refresh may stop working
for various reasons, check out the
troubleshooting guide from @pmmmwh/react-refresh-webpack-plugin react-refresh
for debugging tips.
If any issues persist, try removing the static
directory generated
and run the development server again.