1 | module.exports = after
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2 |
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3 | function after(count, callback, err_cb) {
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4 | var bail = false
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5 | err_cb = err_cb || noop
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6 | proxy.count = count
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7 |
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8 | return (count === 0) ? callback() : proxy
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9 |
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10 | function proxy(err, result) {
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11 | if (proxy.count <= 0) {
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12 | throw new Error('after called too many times')
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13 | }
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14 | --proxy.count
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15 |
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16 | // after first error, rest are passed to err_cb
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17 | if (err) {
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18 | bail = true
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19 | callback(err)
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20 | // future error callbacks will go to error handler
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21 | callback = err_cb
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22 | } else if (proxy.count === 0 && !bail) {
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23 | callback(null, result)
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24 | }
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25 | }
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26 | }
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27 |
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28 | function noop() {}
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