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index.js
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index.js
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if (typeof Proxy !== 'function') {
throw new Error("node-storage-shim requires the ES2015 Proxy built-in to function.")
}
var RESERVED_KEYS = {
length: true,
key: true,
setItem: true,
getItem: true,
removeItem: true,
clear: true
}
var StorageShimProxyHandler = {
set: function (target, property, value) {
target.setItem(property, value)
return true
},
get: function (target, property) {
if (property in RESERVED_KEYS) {
return target[property]
}
return target.getItem(property)
}
}
var StorageShim = function () {
Object.defineProperty(this, 'length', {
enumerable: false,
get: function () {
return Object.keys(this).length
}
})
Object.defineProperty(this, 'key', {
enumerable: false,
value: function (n) {
var key = Object.keys(this)[n]
return key || (key === '' ? key : null)
}
})
Object.defineProperty(this, 'setItem', {
enumerable: false,
value: function (key, value) {
if (key in RESERVED_KEYS) {
throw new Error('Cannot assign to reserved key "' + key + '"')
}
this[key] = '' + value
}
})
Object.defineProperty(this, 'getItem', {
enumerable: false,
value: function (key) {
if (key in RESERVED_KEYS) {
throw new Error('Cannot get reserved key "' + key + '"')
}
var item = this[key]
return item || (item === '' ? item : null)
}
})
Object.defineProperty(this, 'removeItem', {
enumerable: false,
value: function (key) {
delete this[key]
}
})
Object.defineProperty(this, 'clear', {
enumerable: false,
value: function () {
for (var key in this) {
delete this[key]
}
}
})
return new Proxy(this, StorageShimProxyHandler)
}
module.exports = StorageShim