Migration from version 1.x
This chapter provides a set of guidelines to help you migrate from Marble.js version 1.x to version 2.x.
If you are new to Marble.js, starting with 2.x is easy-peasy. The biggest question for current 1.x users though, is how to migrate to the new version. You can ask, how many of the API has changed? Just relax — about 90% of the API is the same and the core concepts haven’t changed.

@marblejs/core

Type declarations

# Effect 👉 HttpEffect
# EffectResponse 👉 HttpEffectResponse
# Middleware 👉 HttpMiddlewareEffect
# ErrorEffect 👉HttpErrorEffect

Effects - body, params, query

In order to improve request type inference HTTP Effect req.params, req.body, req.query are by default of unknown type instead of any.
❌ Old:
const example$: Effect = (req$) =>
req$.pipe(
map(req => req.params.version), // (typeof req.params) = any
map(version => `Version: ${version}`), // (typeof version) = any
map(message => ({ body: message })),
);
✅ New:
const example$: HttpEffect = (req$) =>
req$.pipe(
map(req => req.params.version), // (typeof req.params) = unknown
map(version => `Version: ${version}`), // ❌ type error!
map(message => ({ body: message })),
);
👇
const example$: HttpEffect = (req$) =>
req$.pipe(
map(req => req.params.version), // (typeof req.params) = unknown
map(version => version as string), // or use validation middleware
map(version => `Version: ${version}`), // ✅ looks fine!
map(message => ({ body: message })),
);

Effects - third argument

From version 2.0 the effect function third argument is a common EffectMetadata object which can contain eventual error object or contextual injector.
❌ Old:
const error$: ErrorEffect = (req$, _, error) =>
req$.pipe(
mapTo(error),
// ...
);
✅ New:
const error$: HttpErrorEffect = (req$, _, meta) =>
req$.pipe(
mapTo(meta.error),
// ...
);

httpListener error effect

HTTP error effect is registered inside httpListener configuration object via error$ instead of errorEffect.
❌ Old:
export default httpListener({
// ...
errorEffect: // ...
});
✅ New:
export default httpListener({
// ...
error$: // ...
});

httpListener server bootstrapping

In order to use httpListener directly connected to Node.js http.createServer you have to run and apply Reader context first.
❌ Old:
import { createContext } from '@marblejs/core';
import * as http from 'http';
import httpListener from './http.listener';
const server = http
.createServer(httpListener)
.listen(1337);
✅ New:
  • direct usage
import { createContext } from '@marblejs/core';
import * as http from 'http';
import httpListener from './http.listener';
const httpListenerWithContext = httpListener
.run(createContext());
const server = http
.createServer(httpListenerWithContext)
.listen(1337);
  • using createServer
import { createContext, createServer } from '@marblejs/core';
import httpListener from './http.listener';
const server = createServer({
port: 1337,
httpListener,
});
server.run();

@marblejs/middleware-body

Every body parsing middleware should be registered via function invocation. It allows you to pass an optional middleware configuration object.
❌ Old:
import { bodyParser$ } '@marblejs/middleware-body';
httpListener({
middlewares: [bodyParser$],
// ...
});
✅ New:
import { bodyParser$ } '@marblejs/middleware-body';
httpListener({
middlewares: [bodyParser$()],
// ...
});

@marblejs/middleware-logger

Because previous logger$ wasn't exposed as a function, it was very hard to extend it. Version 1.2.0 deprecated it in favor of loggerWithOpts$ entry point which was more maintainable and could be extended easier. From the version v2.x the logger$ entry point is be swapped with loggerWithOpts$ implementation.
❌ Old:
import { logger$, loggerWithOpts$ } '@marblejs/middleware-logger';
httpListener({
middlewares: [
logger$,
// or
loggerWithOpts$(),
],
// ...
});
✅ New:
import { bodyParser$ } '@marblejs/middleware-body';
httpListener({
middlewares: [logger$()],
// ...
});
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On this page
@marblejs/core
Type declarations
Effects - body, params, query
Effects - third argument
httpListener error effect
httpListener server bootstrapping
@marblejs/middleware-body
@marblejs/middleware-logger