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metamask-extension/app/scripts/lib/ensnare.js
2016-06-21 13:18:32 -07:00

25 lines
622 B
JavaScript

module.exports = ensnare
// creates a proxy object that calls cb everytime the obj's properties/fns are accessed
function ensnare (obj, cb) {
var proxy = {}
Object.keys(obj).forEach(function (key) {
var val = obj[key]
switch (typeof val) {
case 'function':
proxy[key] = function () {
cb()
val.apply(obj, arguments)
}
return
default:
Object.defineProperty(proxy, key, {
get: function () { cb(); return obj[key] },
set: function (val) { cb(); obj[key] = val; return val },
})
return
}
})
return proxy
}