61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = forever;
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _onlyOnce = require('./internal/onlyOnce');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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var _ensureAsync = require('./ensureAsync');
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var _ensureAsync2 = _interopRequireDefault(_ensureAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Calls the asynchronous function `fn` with a callback parameter that allows it
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* to call itself again, in series, indefinitely.
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* If an error is passed to the
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* callback then `errback` is called with the error, and execution stops,
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* otherwise it will never be called.
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*
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* @name forever
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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 {Function} fn - a function to call repeatedly. Invoked with (next).
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* @param {Function} [errback] - when `fn` passes an error to it's callback,
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* this function will be called, and execution stops. Invoked with (err).
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* @example
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*
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* async.forever(
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* function(next) {
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* // next is suitable for passing to things that need a callback(err [, whatever]);
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* // it will result in this function being called again.
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* },
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* function(err) {
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* // if next is called with a value in its first parameter, it will appear
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* // in here as 'err', and execution will stop.
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* }
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* );
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*/
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function forever(fn, errback) {
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var done = (0, _onlyOnce2.default)(errback || _noop2.default);
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var task = (0, _ensureAsync2.default)(fn);
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function next(err) {
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if (err) return done(err);
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task(next);
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}
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next();
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}
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module.exports = exports['default'];
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