eno/lib/hmr.tsx

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let reloads = 0;
const listeners = new Map();
new WebSocket("ws://"+document.location.host).addEventListener('message', (event) =>
{
let handlers = listeners.get(event.data)??[];
reloads++;
Promise.all(
handlers.map(handler=>
{
return import(event.data+"?reload="+reloads)
.then(updatedModule=>handler(updatedModule));
})
).then(HMR.update);
});
export const HMR = {
registered: new Map() as Map<string, ()=>void>,
states: new Map(),
statesOld: new Map(),
reloads: 0,
wireframe: false,
onChange(key:string, value:()=>void):void
{
this.registered.set(key, value);
},
update()
{
this.reloads++;
this.registered.forEach(handler=>handler());
this.registered.clear();
this.statesOld = this.states;
this.states = new Map();
this.echoState();
},
echoState()
{
let output = [];
for(const[key, val] of HMR.statesOld)
{
output[key] = val.state+"--"+val.reload;
}
console.log(output);
output = [];
for(const[key, val] of HMR.states)
{
output[key] = val.state+"--"+val.reload;
}
console.log(output);
}
};
export const MapAt =(inMap, inIndex)=>
{
let index = 0;
for(const kvp of inMap)
{
if(index == inIndex)
{
return kvp;
}
index++;
}
return false;
};