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105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _once = require('./internal/once');
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var _once2 = _interopRequireDefault(_once);
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var _onlyOnce = require('./internal/onlyOnce');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Runs the `tasks` array of functions in series, each passing their results to
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* the next in the array. However, if any of the `tasks` pass an error to their
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* own callback, the next function is not executed, and the main `callback` is
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* immediately called with the error.
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*
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* @name waterfall
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
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* to run.
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* Each function should complete with any number of `result` values.
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* The `result` values will be passed as arguments, in order, to the next task.
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* @param {Function} [callback] - An optional callback to run once all the
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* functions have completed. This will be passed the results of the last task's
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* callback. Invoked with (err, [results]).
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* @returns undefined
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* @example
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*
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* async.waterfall([
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* function(callback) {
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* callback(null, 'one', 'two');
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* },
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* function(arg1, arg2, callback) {
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* // arg1 now equals 'one' and arg2 now equals 'two'
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* callback(null, 'three');
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* },
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* function(arg1, callback) {
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* // arg1 now equals 'three'
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* callback(null, 'done');
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* }
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* ], function (err, result) {
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* // result now equals 'done'
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* });
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*
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* // Or, with named functions:
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* async.waterfall([
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* myFirstFunction,
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* mySecondFunction,
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* myLastFunction,
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* ], function (err, result) {
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* // result now equals 'done'
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* });
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* function myFirstFunction(callback) {
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* callback(null, 'one', 'two');
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* }
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* function mySecondFunction(arg1, arg2, callback) {
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* // arg1 now equals 'one' and arg2 now equals 'two'
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* callback(null, 'three');
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* }
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* function myLastFunction(arg1, callback) {
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* // arg1 now equals 'three'
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* callback(null, 'done');
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* }
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*/
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function waterfall(tasks, callback) {
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callback = (0, _once2.default)(callback);
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if (!Array.isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
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if (!tasks.length) return callback();
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var taskIndex = 0;
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function nextTask(args) {
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var task = (0, _wrapAsync2.default)(tasks[taskIndex++]);
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task(...args, (0, _onlyOnce2.default)(next));
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}
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function next(err, ...args) {
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if (err === false) return;
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if (err || taskIndex === tasks.length) {
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return callback(err, ...args);
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}
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nextTask(args);
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}
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nextTask([]);
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}
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exports.default = (0, _awaitify2.default)(waterfall);
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module.exports = exports['default']; |