batched-promise-all/dist/batched-promise-all.cjs.development.js

:flight_departure: zero deps utility for keeping your memory footprint manageable with varying datasets

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

// A type of promise-like that resolves synchronously and supports only one observer
const _Pact = /*#__PURE__*/(function() {
	function _Pact() {}
	_Pact.prototype.then = function(onFulfilled, onRejected) {
		const result = new _Pact();
		const state = this.s;
		if (state) {
			const callback = state & 1 ? onFulfilled : onRejected;
			if (callback) {
				try {
					_settle(result, 1, callback(this.v));
				} catch (e) {
					_settle(result, 2, e);
				}
				return result;
			} else {
				return this;
			}
		}
		this.o = function(_this) {
			try {
				const value = _this.v;
				if (_this.s & 1) {
					_settle(result, 1, onFulfilled ? onFulfilled(value) : value);
				} else if (onRejected) {
					_settle(result, 1, onRejected(value));
				} else {
					_settle(result, 2, value);
				}
			} catch (e) {
				_settle(result, 2, e);
			}
		};
		return result;
	};
	return _Pact;
})();

// Settles a pact synchronously
function _settle(pact, state, value) {
	if (!pact.s) {
		if (value instanceof _Pact) {
			if (value.s) {
				if (state & 1) {
					state = value.s;
				}
				value = value.v;
			} else {
				value.o = _settle.bind(null, pact, state);
				return;
			}
		}
		if (value && value.then) {
			value.then(_settle.bind(null, pact, state), _settle.bind(null, pact, 2));
			return;
		}
		pact.s = state;
		pact.v = value;
		const observer = pact.o;
		if (observer) {
			observer(pact);
		}
	}
}

function _isSettledPact(thenable) {
	return thenable instanceof _Pact && thenable.s & 1;
}

// Asynchronously iterate through an object that has a length property, passing the index as the first argument to the callback (even as the length property changes)
function _forTo(array, body, check) {
	var i = -1, pact, reject;
	function _cycle(result) {
		try {
			while (++i < array.length && (!check || !check())) {
				result = body(i);
				if (result && result.then) {
					if (_isSettledPact(result)) {
						result = result.v;
					} else {
						result.then(_cycle, reject || (reject = _settle.bind(null, pact = new _Pact(), 2)));
						return;
					}
				}
			}
			if (pact) {
				_settle(pact, 1, result);
			} else {
				pact = result;
			}
		} catch (e) {
			_settle(pact || (pact = new _Pact()), 2, e);
		}
	}
	_cycle();
	return pact;
}

const _iteratorSymbol = /*#__PURE__*/ typeof Symbol !== "undefined" ? (Symbol.iterator || (Symbol.iterator = Symbol("Symbol.iterator"))) : "@@iterator";

// Asynchronously iterate through an object's values
// Uses for...of if the runtime supports it, otherwise iterates until length on a copy
function _forOf(target, body, check) {
	if (typeof target[_iteratorSymbol] === "function") {
		var iterator = target[_iteratorSymbol](), step, pact, reject;
		function _cycle(result) {
			try {
				while (!(step = iterator.next()).done && (!check || !check())) {
					result = body(step.value);
					if (result && result.then) {
						if (_isSettledPact(result)) {
							result = result.v;
						} else {
							result.then(_cycle, reject || (reject = _settle.bind(null, pact = new _Pact(), 2)));
							return;
						}
					}
				}
				if (pact) {
					_settle(pact, 1, result);
				} else {
					pact = result;
				}
			} catch (e) {
				_settle(pact || (pact = new _Pact()), 2, e);
			}
		}
		_cycle();
		if (iterator.return) {
			var _fixup = function(value) {
				try {
					if (!step.done) {
						iterator.return();
					}
				} catch(e) {
				}
				return value;
			};
			if (pact && pact.then) {
				return pact.then(_fixup, function(e) {
					throw _fixup(e);
				});
			}
			_fixup();
		}
		return pact;
	}
	// No support for Symbol.iterator
	if (!("length" in target)) {
		throw new TypeError("Object is not iterable");
	}
	// Handle live collections properly
	var values = [];
	for (var i = 0; i < target.length; i++) {
		values.push(target[i]);
	}
	return _forTo(values, function(i) { return body(values[i]); }, check);
}

const _asyncIteratorSymbol = /*#__PURE__*/ typeof Symbol !== "undefined" ? (Symbol.asyncIterator || (Symbol.asyncIterator = Symbol("Symbol.asyncIterator"))) : "@@asyncIterator";

function chunkArray(array, chunkSize) {
  const resultArray = [];

  for (let i = 0, len = array.length; i < len; i += chunkSize) {
    resultArray.push(array.slice(i, i + chunkSize));
  }

  return resultArray;
}

const batchedPromiseAll = function (promiseArr, iterationCb, batchSize) {
  try {
    const chunkedPromiseArr = chunkArray(promiseArr, batchSize);
    let result = [];
    let currentIndex = -1;

    const _temp = _forOf(chunkedPromiseArr, function (chunk) {
      return Promise.resolve(Promise.all(chunk.map(item => {
        currentIndex++;
        return iterationCb(item, currentIndex);
      }))).then(function (chunkResult) {
        result = result.concat(chunkResult);
      });
    });

    return Promise.resolve(_temp && _temp.then ? _temp.then(function () {
      return result;
    }) : result);
  } catch (e) {
    return Promise.reject(e);
  }
};

exports.batchedPromiseAll = batchedPromiseAll;
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