Hi all:
I’m wondering if there is any way to combine a class decorator and an async
process together? A common case would be a generic IoC implementation:
Since in JavaScript IoC we load runtime modules async by a config file, the
interface may be:
{Promise} ioc.getComponent({string} componentName)
which resolves the returned Promise giving required instance of componentName,
and this is a method that cannot be sync since we need a config file to map
componentName to its implementing module and load the module lazily (for
performance reason)
This is an async process so if we add a decorator to a class property:
function inject(name) {
return (target, key, descriptor) {
// Note this returns a promise, not the actual property value
descriptor.initializer = () => ioc.getComponent(name);
}
}
class Hero {
@inject('knife')
weapon = null
hit(enemy) {
enemy.heath -= (this.weapon.power - enemy.defense);
}
}
This code may not work, but nobody likes there injected properties to be all
async getters and all code logics become unnecessarily complex by introducing
so many async processes
How so we think of such common case, should I just make the ioc.getComponent
sync without considerations to performance, or should I give up the decorator
solution?
Thanks
Best regards
Gray Zhang_______________________________________________
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