git ssb

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'use strict'
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var abortCb = require('../util/abort-cb')
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module.exports = function once (value, onAbort) {
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  return function (abort, cb) {
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    if(abort)
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      return abortCb(cb, abort, onAbort)
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    if(value != null) {
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      var _value = value; value = null
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      cb(null, _value)
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    } else
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      cb(true)
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  }
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}
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