(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.fetchRetry = factory());
})(this, (function () { 'use strict';

  var fetchRetry = function (fetch, defaults) {
    defaults = defaults || {};
    if (typeof fetch !== 'function') {
      throw new ArgumentError('fetch must be a function');
    }

    if (typeof defaults !== 'object') {
      throw new ArgumentError('defaults must be an object');
    }

    if (defaults.retries !== undefined && !isPositiveInteger(defaults.retries)) {
      throw new ArgumentError('retries must be a positive integer');
    }

    if (defaults.retryDelay !== undefined && !isPositiveInteger(defaults.retryDelay) && typeof defaults.retryDelay !== 'function') {
      throw new ArgumentError('retryDelay must be a positive integer or a function returning a positive integer');
    }

    if (defaults.retryOn !== undefined && !Array.isArray(defaults.retryOn) && typeof defaults.retryOn !== 'function') {
      throw new ArgumentError('retryOn property expects an array or function');
    }

    var baseDefaults = {
      retries: 3,
      retryDelay: 1000,
      retryOn: [],
    };

    defaults = Object.assign(baseDefaults, defaults);

    return function fetchRetry(input, init) {
      var retries = defaults.retries;
      var retryDelay = defaults.retryDelay;
      var retryOn = defaults.retryOn;

      if (init && init.retries !== undefined) {
        if (isPositiveInteger(init.retries)) {
          retries = init.retries;
        } else {
          throw new ArgumentError('retries must be a positive integer');
        }
      }

      if (init && init.retryDelay !== undefined) {
        if (isPositiveInteger(init.retryDelay) || (typeof init.retryDelay === 'function')) {
          retryDelay = init.retryDelay;
        } else {
          throw new ArgumentError('retryDelay must be a positive integer or a function returning a positive integer');
        }
      }

      if (init && init.retryOn) {
        if (Array.isArray(init.retryOn) || (typeof init.retryOn === 'function')) {
          retryOn = init.retryOn;
        } else {
          throw new ArgumentError('retryOn property expects an array or function');
        }
      }

      // eslint-disable-next-line no-undef
      return new Promise(function (resolve, reject) {
        var wrappedFetch = function (attempt) {
          // As of node 18, this is no longer needed since node comes with native support for fetch:
          /* istanbul ignore next */
          var _input =
            typeof Request !== 'undefined' && input instanceof Request
              ? input.clone()
              : input;
          fetch(_input, init)
            .then(function (response) {
              if (Array.isArray(retryOn) && retryOn.indexOf(response.status) === -1) {
                resolve(response);
              } else if (typeof retryOn === 'function') {
                try {
                  // eslint-disable-next-line no-undef
                  return Promise.resolve(retryOn(attempt, null, response))
                    .then(function (retryOnResponse) {
                      if(retryOnResponse) {
                        retry(attempt, null, response);
                      } else {
                        resolve(response);
                      }
                    }).catch(reject);
                } catch (error) {
                  reject(error);
                }
              } else {
                if (attempt < retries) {
                  retry(attempt, null, response);
                } else {
                  resolve(response);
                }
              }
            })
            .catch(function (error) {
              if (typeof retryOn === 'function') {
                try {
                  // eslint-disable-next-line no-undef
                  Promise.resolve(retryOn(attempt, error, null))
                    .then(function (retryOnResponse) {
                      if(retryOnResponse) {
                        retry(attempt, error, null);
                      } else {
                        reject(error);
                      }
                    })
                    .catch(function(error) {
                      reject(error);
                    });
                } catch(error) {
                  reject(error);
                }
              } else if (attempt < retries) {
                retry(attempt, error, null);
              } else {
                reject(error);
              }
            });
        };

        function retry(attempt, error, response) {
          var delay = (typeof retryDelay === 'function') ?
            retryDelay(attempt, error, response) : retryDelay;
          setTimeout(function () {
            wrappedFetch(++attempt);
          }, delay);
        }

        wrappedFetch(0);
      });
    };
  };

  function isPositiveInteger(value) {
    return Number.isInteger(value) && value >= 0;
  }

  function ArgumentError(message) {
    this.name = 'ArgumentError';
    this.message = message;
  }

  return fetchRetry;

}));