Function createRetryMiddleware

Create a retry middleware with exponential backoff

Creates middleware that automatically retries failed requests with configurable backoff strategies. Supports exponential, linear, and fixed delay patterns.

Example: Basic retry with defaults

import { createFej, createRetryMiddleware } from 'fej';

const api = createFej();
api.use('retry', createRetryMiddleware({
  attempts: 3,
  delay: 1000,
  backoff: 'exponential',
}), 50); // Priority 50 to run before other middleware
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Example: Custom retry logic

api.use('retry', createRetryMiddleware({
  attempts: 5,
  delay: 500,
  backoff: 'exponential',
  maxDelay: 10000,
  shouldRetry: (error, ctx) => {
    // Only retry on network errors or 5xx status codes
    return error.name === 'NetworkError' ||
           (ctx.response && ctx.response.status >= 500);
  },
  onRetry: (error, attempt, ctx) => {
    console.log(`Retry attempt ${attempt} for ${ctx.request.url}`);
  },
}));
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