| 1 | module.exports = function (target, lookup, checkUpdated) {
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| 2 | target.keys = function () {
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| 3 | checkUpdated && checkUpdated()
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| 4 | return Object.keys(lookup)
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| 5 | }
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| 6 |
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| 7 | target.get = function (key) {
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| 8 | checkUpdated && checkUpdated()
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| 9 | return lookup[key]
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| 10 | }
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| 11 |
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| 12 | target.has = function (key) {
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| 13 | checkUpdated && checkUpdated()
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| 14 | return key in lookup
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| 15 | }
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| 16 | }
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