Migrating from evlog

Map evlog wide events to Logixlysia request context and access logs

Plugin setup

evlog

import { evlog } from 'evlog/elysia'

new Elysia().use(evlog({ drain: myDrain }))

Logixlysia

import logixlysia from 'logixlysia'

new Elysia().use(logixlysia({ preset: 'prod' }))

Context accumulation

evlog	Logixlysia
log.set({ userId: 'x' })	store.logger.mergeContext(request, { userId: 'x' })
log.set({ cart: { total: 99 } })	store.logger.mergeContext(request, { cart: { total: 99 } })
useLogger()	store.logger in handlers

Emitting the request log

evlog:

log.emit({ status: 200 })

Logixlysia emits the access log automatically in afterHandle. Use a custom log only when you need to skip the default line:

store.logger.info(request, 'handled manually')

AI metrics

evlog — automatic via evlog/ai.

Logixlysia

import { mergeAIMetrics } from 'logixlysia/ai'

mergeAIMetrics(store.logger, request, {
  model: 'claude-sonnet',
  inputTokens: 100,
  outputTokens: 50,
  totalTokens: 150
})

Tracing

Use injectTraceContext from logixlysia/otel in the request hook (see OpenTelemetry).

Drains vs transports

evlog drains map to Logixlysia transports:

logixlysia({
  config: {
    transports: [
      {
        log: (level, message, meta) => {
          myDrain.write({ level, message, ...meta })
        }
      }
    ],
    useTransportsOnly: true
  }
})