31 lines
588 B
TypeScript
31 lines
588 B
TypeScript
|
function prop (object, name, f) {
|
||
|
|
Object.defineProperty(object, name, {
|
||
|
|
configurable: true,
|
||
|
|
enumerable: true,
|
||
|
|
get: function () {
|
||
|
|
let value = f.call(this)
|
||
|
|
this[name] = value
|
||
|
|
return value
|
||
|
|
},
|
||
|
|
set: function (value) {
|
||
|
|
Object.defineProperty(this, name, {
|
||
|
|
configurable: true,
|
||
|
|
enumerable: true,
|
||
|
|
value: value,
|
||
|
|
writable: true
|
||
|
|
})
|
||
|
|
}
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
function value (f) {
|
||
|
|
let value
|
||
|
|
return function () {
|
||
|
|
if (value !== undefined) return value
|
||
|
|
value = f()
|
||
|
|
return value
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = { prop, value }
|