Function createCancellationMiddleware

createCancellationMiddleware(fejInstance, config?): FejMiddlewareFunction

Create a cancellation middleware that automatically tracks requests

Creates middleware that automatically tracks requests using AbortController, enabling cancellation via the Fej instance methods.

Parameters

fejInstance: Fej
The Fej instance to use for tracking
config: CancellationMiddlewareConfig = {}
Configuration options

Returns FejMiddlewareFunction

Middleware function

Example: Basic request tracking

import { createFej, createCancellationMiddleware } from 'fej';

const api = createFej();
api.use('cancellation', createCancellationMiddleware(api));

// Requests are now automatically tracked
const response = await api.fej('/api/data');

Example: With tags for grouping

api.use('cancellation', createCancellationMiddleware(api, {
  tags: ['dashboard', 'high-priority'],
}));

// Later: cancel all dashboard requests
api.abortRequestsByTag('dashboard');

Example: With cancellation callback

api.use('cancellation', createCancellationMiddleware(api, {
  onCancel: (requestId, ctx) => {
    console.log(`Request ${requestId} was cancelled`);
  },
}));