29 lines
685 B
JavaScript
29 lines
685 B
JavaScript
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module.exports = after
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function after(count, callback, err_cb) {
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var bail = false
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err_cb = err_cb || noop
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proxy.count = count
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return (count === 0) ? callback() : proxy
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function proxy(err, result) {
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if (proxy.count <= 0) {
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throw new Error('after called too many times')
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}
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--proxy.count
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// after first error, rest are passed to err_cb
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if (err) {
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bail = true
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callback(err)
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// future error callbacks will go to error handler
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callback = err_cb
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} else if (proxy.count === 0 && !bail) {
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callback(null, result)
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}
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}
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}
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function noop() {}
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