src: remove internalBinding('config').warningFile

Instead use `require('internal/options')` lazily. Also refactor the
call site a bit so that the option is queried only once since it's
synchronous anyway.

PR-URL: #24959
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/process/warning.js

@@ -1,11 +1,18 @@
 'use strict';
 
-const config = process.binding('config');
 const prefix = `(${process.release.name}:${process.pid}) `;
 const { ERR_INVALID_ARG_TYPE } = require('internal/errors').codes;
 
 exports.setup = setupProcessWarnings;
 
+let options;
+function lazyOption(name) {
+  if (!options) {
+    options = require('internal/options');
+  }
+  return options.getOptionValue(name);
+}
+
 var cachedFd;
 var acquiringFd = false;
 function nop() {}
@@ -51,11 +58,11 @@ function onAcquired(message) {
   };
 }
 
-function acquireFd(cb) {
+function acquireFd(warningFile, cb) {
   if (cachedFd === undefined && !acquiringFd) {
     acquiringFd = true;
     if (fs === null) fs = require('fs');
-    fs.open(config.warningFile, 'a', onOpen(cb));
+    fs.open(warningFile, 'a', onOpen(cb));
   } else if (cachedFd !== undefined && !acquiringFd) {
     cb(null, cachedFd);
   } else {
@@ -64,8 +71,9 @@ function acquireFd(cb) {
 }
 
 function output(message) {
-  if (typeof config.warningFile === 'string') {
-    acquireFd(onAcquired(message));
+  const warningFile = lazyOption('--redirect-warnings');
+  if (warningFile) {
+    acquireFd(warningFile, onAcquired(message));
     return;
   }
   writeOut(message);

src/node_config.cc

@@ -117,11 +117,6 @@ static void Initialize(Local<Object> target,
                     "bits",
                     Number::New(env->isolate(), 8 * sizeof(intptr_t)));
 
-  const std::string& warning_file = env->options()->redirect_warnings;
-  if (!warning_file.empty()) {
-    READONLY_STRING_PROPERTY(target, "warningFile", warning_file);
-  }
-
   std::shared_ptr<DebugOptions> debug_options = env->options()->debug_options;
   Local<Object> debug_options_obj = Object::New(isolate);
   READONLY_PROPERTY(target, "debugOptions", debug_options_obj);