lib: explicitly initialize debuglog during bootstrap

This patch splits the implementation of util.debuglog into a
separate file and explicitly initialize it during pre-execution
since the initialization depends on environment variables.
Also delays the call to `debuglog` in modules that are loaded during
bootstrap to make sure we only access the environment variable
during pre-execution.

PR-URL: https://github.com/nodejs/node/pull/26468
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

1 files changed, 9 insertions, 2 deletions

diff --git a/lib/_stream_readable.js b/lib/_stream_readable.js
index 85d1fb0c33..957f232b63 100644
--- a/lib/_stream_readable.js
+++ b/lib/_stream_readable.js
@@ -27,8 +27,15 @@ Readable.ReadableState = ReadableState;
 const EE = require('events');
 const Stream = require('stream');
 const { Buffer } = require('buffer');
-const util = require('util');
-const debug = util.debuglog('stream');
+
+let debuglog;
+function debug(...args) {
+  if (!debuglog) {
+    debuglog = require('internal/util/debuglog').debuglog('stream');
+  }
+  debuglog(...args);
+}
+
 const BufferList = require('internal/streams/buffer_list');
 const destroyImpl = require('internal/streams/destroy');
 const { getHighWaterMark } = require('internal/streams/state');