eno/lib/hmr.tsx
Seth Trowbridge 8a1b7e7dbd hmr fixes
allow page refresh, add keep-alive ping
2023-05-06 09:51:55 -04:00

76 lines
1.8 KiB
TypeScript

let reloads = 0;
const listeners = new Map() as Map<string, Array<(module:unknown)=>void>>;
const socket:WebSocket = new WebSocket("ws://"+document.location.host);
socket.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());
});
const socketTimer = setInterval(()=>{socket.send("ping")}, 1000);
export const FileListen =(inPath:string, inHandler:()=>void)=>
{
const members = listeners.get(inPath)??[];
members.push(inHandler);
listeners.set(inPath, members);
};
const HMR = {
reloads:0,
registered: new Map() as Map<string, ()=>void>,
states: new Map(),
statesOld: new Map(),
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 {HMR};
export const MapAt =(inMap, inIndex)=>
{
let index = 0;
for(const kvp of inMap)
{
if(index == inIndex)
{
return kvp;
}
index++;
}
return false;
};