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Lazy getters
import { makeFoo, makeBar } from "./providers.js"
* Create property `name` on `obj` that will run `provider`'s factory method the first time
function makeLazyGetter(obj, name, provider){
let value
Object.defineProperty(obj, name, {
get: function(){
value= factory()
return value
export function injectProvidersMiddleware(req){
makeLazyGetter(req, "foo", makeFoo)
makeLazyGetter(req, "bar", makeBar)
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