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36 lines
1.1 KiB
36 lines
1.1 KiB
4 years ago
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'use strict'
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// For (old) browser support
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var xtend = require('xtend')
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var assign = require('xtend/mutable')
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module.exports = function supports () {
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var manifest = xtend.apply(null, arguments)
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return assign(manifest, {
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// Features of abstract-leveldown
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bufferKeys: manifest.bufferKeys || false,
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snapshots: manifest.snapshots || false,
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permanence: manifest.permanence || false,
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seek: manifest.seek || false,
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clear: manifest.clear || false,
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// Features of abstract-leveldown that levelup doesn't have
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status: manifest.status || false,
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// Features of disk-based implementations
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createIfMissing: manifest.createIfMissing || false,
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errorIfExists: manifest.errorIfExists || false,
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// Features of level(up) that abstract-leveldown doesn't have yet
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deferredOpen: manifest.deferredOpen || false,
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openCallback: manifest.openCallback || false,
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promises: manifest.promises || false,
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streams: manifest.streams || false,
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encodings: manifest.encodings || false,
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// Methods that are not part of abstract-leveldown or levelup
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additionalMethods: xtend(manifest.additionalMethods)
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})
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}
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