fix: stop changing logs if flusher is not set (#5676)

Author: eduardoboucas

packages/build/src/log/logger.ts

@@ -190,7 +190,7 @@ export const getSystemLogger = function (
   return (...args) => fileDescriptor.write(`${reduceLogLines(args)}\n`)
 }
 
-export const addOutputGate = (logs: Logs, outputFlusher: OutputFlusher): Logs => {
+export const addOutputFlusher = (logs: Logs, outputFlusher: OutputFlusher): Logs => {
   if (logsAreBuffered(logs)) {
     return {
       ...logs,

packages/build/src/steps/core_step.ts

@@ -1,6 +1,6 @@
 import { setEnvChanges } from '../env/changes.js'
 import { addErrorInfo, isBuildError } from '../error/info.js'
-import { addOutputGate } from '../log/logger.js'
+import { addOutputFlusher } from '../log/logger.js'
 
 import { updateNetlifyConfig, listConfigSideFiles } from './update_config.js'
 
@@ -40,7 +40,7 @@ export const fireCoreStep = async function ({
   deployId,
   outputFlusher,
 }) {
-  const logsA = addOutputGate(logs, outputFlusher)
+  const logsA = outputFlusher ? addOutputFlusher(logs, outputFlusher) : logs
 
   try {
     const configSideFiles = await listConfigSideFiles([headersPath, redirectsPath])

packages/build/src/steps/plugin.js

@@ -1,7 +1,7 @@
 import { context, propagation } from '@opentelemetry/api'
 
 import { addErrorInfo } from '../error/info.js'
-import { addOutputGate } from '../log/logger.js'
+import { addOutputFlusher } from '../log/logger.js'
 import { logStepCompleted } from '../log/messages/ipc.js'
 import { pipePluginOutput, unpipePluginOutput } from '../log/stream.js'
 import { callChild } from '../plugins/ipc.js'
@@ -43,7 +43,7 @@ export const firePluginStep = async function ({
   const otelCarrier = {}
   propagation.inject(context.active(), otelCarrier)
 
-  const logsA = addOutputGate(logs, outputFlusher)
+  const logsA = addOutputFlusher(logs, outputFlusher)
 
   try {
     const configSideFiles = await listConfigSideFiles([headersPath, redirectsPath])