Is store/state per-request or global?

[crishoj]

From https://elysiajs.com/essential/context.html#store it is not completely clear whether state assignments are per-request or shared among all requests.

Case in point: Suppose I would like to time response times with something like this...

export const requestLogging = new Elysia()
    .state('requestStart', 0)
    .onRequest(({store}) => {
        store.requestStart = Bun.nanoseconds()
    })
    .onResponse({as: 'global'}, ({request, set, store}) => {
        const url = new URL(request.url)
        const duration = formatDuration(Bun.nanoseconds() - store.requestStart)
        requestLogger.debug(
            chalk.grey('HTTP'), request.method, `${url.pathname}${url.search}`,
            chalk.grey('→ HTTP'), set.status, chalk.gray(`[${duration}]`))
    })

What happens if two requests are overlapping and handled concurrently? Would the second request overwrite requestStart in the store?

[SaltyAom]

state and decorate is global as stated in https://elysiajs.com/essential/handler.html#state

State is a global mutable object or state shared across the Elysia app.

resolve and derive is per request as stated in https://elysiajs.com/essential/handler.html#derive

Because derive is assigned once a new request starts

[crishoj]

Thank you @SaltyAom, that's perfectly clear.