From 274ae35f774c6cb268f79f90d2e6b95c2be89f4c Mon Sep 17 00:00:00 2001
From: Memo <mehmetxeris@gmail.com>
Date: Thu, 23 Jul 2026 14:00:24 +0200
Subject: [PATCH] fix(next): thread redact through
 createInstrumentation().register()
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register() re-initialised the global logger without threading options.redact
and then locked it, clobbering the redact config createEvlog applied at
import — silently disabling redaction for the documented Next.js
instrumentation setup. Next-only: the handler path (#409) and both nitro
plugins already thread it.

Adds the redact option to InstrumentationOptions (matching the handler
path's raw pass-through; the logger resolves it internally) and a
regression test on the initLogger spy.
---
 .changeset/fix-next-instrumentation-redact.md     | 5 +++++
 packages/evlog/src/next/instrumentation-create.ts | 5 ++++-
 packages/evlog/test/next/instrumentation.test.ts  | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/fix-next-instrumentation-redact.md

diff --git a/.changeset/fix-next-instrumentation-redact.md b/.changeset/fix-next-instrumentation-redact.md
new file mode 100644
index 00000000..abe638e0
--- /dev/null
+++ b/.changeset/fix-next-instrumentation-redact.md
@@ -0,0 +1,5 @@
+---
+"evlog": patch
+---
+
+fix(next): thread `redact` through `createInstrumentation().register()` — it previously re-initialised the logger without redaction and locked it, silently disabling `redact` configured for the Next.js instrumentation path
diff --git a/packages/evlog/src/next/instrumentation-create.ts b/packages/evlog/src/next/instrumentation-create.ts
index cfed3c23..f6c3b98a 100644
--- a/packages/evlog/src/next/instrumentation-create.ts
+++ b/packages/evlog/src/next/instrumentation-create.ts
@@ -1,5 +1,5 @@
 import { registerDiskPrettyErrorSnippetReader } from '../shared/register-disk-snippet'
-import type { DrainContext, EnvironmentContext, LogLevel, Log, SamplingConfig } from '../types'
+import type { DrainContext, EnvironmentContext, LogLevel, Log, RedactConfig, SamplingConfig } from '../types'
 import type {
   NextInstrumentationErrorContext,
   NextInstrumentationRequest,
@@ -58,6 +58,8 @@ export interface InstrumentationOptions {
   stringify?: boolean
   /** Drain callback called with every emitted event. */
   drain?: (ctx: DrainContext) => void | Promise<void>
+  /** Auto-redaction configuration for PII protection. @default true in production */
+  redact?: boolean | RedactConfig
   /** Capture stdout/stderr as structured log events (Node.js only). */
   captureOutput?: boolean | CaptureOutputOptions
 }
@@ -204,6 +206,7 @@ export function createInstrumentation(options: InstrumentationOptions = {}): Ins
         minLevel: options.minLevel,
         stringify: options.stringify,
         drain: options.drain,
+        redact: options.redact,
       })
       lockLogger()
       if (process.env.NEXT_RUNTIME === 'nodejs') {
diff --git a/packages/evlog/test/next/instrumentation.test.ts b/packages/evlog/test/next/instrumentation.test.ts
index ec30cf9c..4f35c534 100644
--- a/packages/evlog/test/next/instrumentation.test.ts
+++ b/packages/evlog/test/next/instrumentation.test.ts
@@ -81,6 +81,7 @@ describe('createInstrumentation', () => {
       drain: drainMock,
       sampling: { rates: { info: 50 } },
       stringify: false,
+      redact: { paths: ['error.message', 'error.cause'] },
     })
 
     await runRegister(register)
@@ -93,6 +94,7 @@ describe('createInstrumentation', () => {
     expect(config.drain).toBe(drainMock)
     expect(config.sampling).toEqual({ rates: { info: 50 } })
     expect(config.stringify).toBe(false)
+    expect(config.redact).toEqual({ paths: ['error.message', 'error.cause'] })
   })
 
   it('register() with captureOutput patches stdout and stderr', async () => {