get-it/src/util/middlewareReducer.ts

Generic HTTP request library for node, browsers and workers

import type {ApplyMiddleware, MiddlewareReducer} from 'get-it'

export const middlewareReducer = (middleware: MiddlewareReducer) =>
  function applyMiddleware(hook, defaultValue, ...args) {
    const bailEarly = hook === 'onError'

    let value = defaultValue
    for (let i = 0; i < middleware[hook].length; i++) {
      const handler = middleware[hook][i]
      // @ts-expect-error -- find a better way to deal with argument tuples
      value = handler(value, ...args)

      if (bailEarly && !value) {
        break
      }
    }

    return value
  } as ApplyMiddleware