msw 0.20.0

on Node.js Yarn

Breaking changes

• composeMocks function has been removed (#236, #239). Please use setupWorker instead.

-import { composeMocks, rest } from 'msw'
-composeMocks(rest.get(...))

+import { setupWorker, rest } from 'msw'
+setupWorker(rest.get(...))

Features

• Adds React Native support (#203, #269).

import { setupServer } from 'msw/native'
import { rest } from 'msw'

const server = setupServer(
  rest.get('/user', (req, res, ctx) => {
    return res(ctx.json({ firstName: 'John' })
  })
)

The setupServer API for React Native is the exact mirror of the same API for NodeJS. Read more in the documentation: https://mswjs.io/docs/api/setup-server

• Adds support for binary response types (#221, #224, Binary response type recipe).
• Adds an option to warn/error/execute arbitrary logic on unmatched request (#191, setupWorker docs, setupServer docs).

const server = setupServer(
  rest.get('/books', (req, res, ctx) => res())
)

server.listen({
  onUnhandledRequest: 'error'
})

fetch('/user') // ERROR! Unhandled request.

• Adds a req.cookies property to access a request’s cookies (#199, #261, Accessing request cookies recipe).
• Adds support for network error emulation (#253, res.networkError API):

rest.post('/login', (req, res, ctx) => {
  return res.networkError('Custom error message')
})

Bug fixes

• Fixes an issue that resulted into a "global is not defined" error being thrown in a browser (#255).
• Fixes an issue that resulted into the worker listeners being established multiple times after repetitive calls to worker.start() or Hot Reload (#244).
• Fixes an issue that failed response patching in NodeJS (#264, #266).
• Fixes an issue that resulted into the XMLHttpRequest.prototype.addEventListener events being ignored (#267).
• Fixes an issue that resulted into timeout in POST requests with a body in NodeJS (#277).
• Fixes an invalidly typed req.body in case of GraphQL request (#297, #302).
• Updates library's dependencies (#306).